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SWE-bench Verified — canonical hybrid CWM

SWE-bench Verified, all 500 instances held out · Haiku 4.5 agent · official test grading · canonical architecture: the router sends bash to the pod and code execution to the world model; routed commands are never run; the agent receives only the parsed rubric → reward verdicts as markdown. The 9/07 page (run-and-hide, full-text channel) is the historical record.

1Experiment setting

Each instance is a real GitHub issue in a Python repository; the agent must produce a patch that makes the hidden FAIL_TO_PASS tests pass without breaking PASS_TO_PASS. Resolved = the official SWE-bench harness verdict.

A Haiku 4.5 agent works in the repository by issuing bash commands. The settings differ only in what answers those commands:

Canonical implementation (these are real runs). Same four settings and the same router as the 9/07 page. The one difference from the 9/07 runs: a command the router sends to the world model is never run — earlier runs executed it and hid its output. Reads, searches and edits still run in the pod; the world model grades the real git diff against the retrieved rubrics and the agent receives only the parsed verdicts (reward, violated criteria, checked criteria), nothing else.

Interpreter baseline — every command runs; the agent sees real output.

No code execution (floor) — reads and edits are real; runs return nothing.

All-CWM (original) — the CWM answers everything, using the same retrieved rubrics; the agent cannot read code.

Hybrid CWM (this work) — reads go to the interpreter, runs go to the CWM with retrieved rubrics.

The router is a fixed rule, not a model. The command string is split on every bash separator (\n ; && || | &), heredoc bodies are dropped and wrapper prefixes (sudo, timeout N, VAR=x) skipped; a command is code execution if any segment's first word is an interpreter or test runner (python, pytest, tox, make, manage.py, runtests.py, bash, sh, …), a script or repo executable (./run.sh, /testbed/bin/x), or contains a substitution / xargs / find -exec that runs one. Everything else — cat, ls, grep, sed -i, git, heredoc writes — is a read or edit and goes to the interpreter. A mixed command such as cat > t.py <<EOF … EOF && python t.py counts as execution.

The CWM (Haiku 4.5 or Opus 5) reads the task, the agent's current diff and the command, grades the diff against the 12 rubrics retrieved from the mined library (nearest to the task, the files the diff touches and the command; in the hybrid arms a standing task criterion — “does the change implement what the issue asks?” — is added to the list) and returns the per-rubric verdict. A routed command never runs, so there is no output to leak; every trajectory is audited for leakage and the router is red-teamed (194 cases). No setting ever sees the hidden grading tests.

2Results

resolved, % of 500

arm	count	rate	also
interpreter · real · execution	339/500	67.8%	submitted 500 · errors 0
no code exec. · bash · only	297/500	59.4%	submitted 500 · errors 0
all-CWM · Opus · mined 10	pending
all-CWM · Opus · mined 100	1/500	0.2%	submitted 500 · errors 0
all-CWM · Opus · mined 1000	pending
hybrid CWM · Haiku · task only	298/500	59.6%	submitted 500 · errors 0
hybrid CWM · Haiku · 1000 rubrics	315/500	63.0%	submitted 500 · errors 0
hybrid CWM · Opus · task only	309/500	61.8%	submitted 500 · errors 0
hybrid CWM · Opus · 10 rubrics	297/500	59.4%	submitted 500 · errors 0
hybrid CWM · Opus · 100 rubrics	303/500	60.6%	submitted 500 · errors 0
hybrid CWM · Opus · 1000 rubrics	285/499	57.1%	submitted 499 · errors 0
hybrid CWM · Opus · 12 random	302/500	60.4%	submitted 500 · errors 0
simulator · Haiku · pure	253/500	50.6%	submitted 500 · errors 0

Efficiency: median wall-clock per instance

Wall-clock per instance from the first command to the last (minutes), from the per-command timing records of each pod. Arms marked Low key were re-run on a different API organisation after rate limiting; its agent-model calls took 2.7 s against 1.4 s on the key the other arms used (~85 calls per instance, so about +2 min per instance). Accuracy is unaffected; these bars are not directly comparable on wall clock until re-run on the same key.

Efficiency: median agent LLM calls per instance

Efficiency: median seconds per LLM call (wall clock / calls, per instance)

Wall clock is calls × seconds per call. This chart isolates the second factor: the time the agent waits per step, which contains the model call and, in the world-model arms, the judge verdict; in the interpreter it contains the real execution. An arm that is slower here costs more per step; an arm that is slower only in wall clock took more steps.

Efficiency: median cost per instance (agent + world model, $; judge cost = graded observations x that arm's $/grade)

Judge call vs real execution, per instance and by difficulty

Interpreter arm: time of each executed command from the pod timing records. Hybrid arms (scale1000-c, nolib-c): routed commands never run; the judge latency is inferred per instance from the harness's own git diff that precedes every grade (next command start − end of that diff − the instance's median agent-call latency). Difficulty = the SWE-bench Verified annotation.

bucket	n	interp wall	exec cmds	s / exec cmd	exec total	scale1000-c wall	scale1000-c grades	scale1000-c s / judge call	scale1000-c judge total	nolib-c wall	nolib-c grades	nolib-c s / judge call	nolib-c judge total
difficulty: <15 min fix	194	2.3 min	18	1.1 s	0.5 min	4.7 min	9	8.1 s	1.4 min	3.9 min	9	2.7 s	0.5 min
difficulty: 15 min - 1 hour	261	3.2 min	24	1.1 s	0.6 min	6.2 min	10	11.7 s	2.0 min	5.2 min	9	5.1 s	0.8 min
difficulty: 1-4 hours	42	4.2 min	30	1.0 s	0.8 min	7.9 min	12	15.2 s	3.1 min	6.3 min	9	6.2 s	1.2 min
difficulty: >4 hours	3	3.9 min	28	1.0 s	0.8 min	7.2 min	7	9.8 s	0.9 min	6.6 min	4	1.9 s	0.5 min
repo: astropy/astropy	22	2.8 min	20	1.2 s	0.6 min	5.8 min	12	11.6 s	2.2 min	4.9 min	9	5.1 s	0.8 min
repo: django/django	231	2.9 min	23	1.0 s	0.5 min	5.9 min	11	10.3 s	1.9 min	4.7 min	10	3.3 s	0.6 min
repo: matplotlib/matplotlib	34	3.6 min	22	1.5 s	1.1 min	5.6 min	6	12.7 s	1.4 min	5.5 min	5	6.4 s	0.4 min
repo: mwaskom/seaborn	2	5.2 min	40	1.3 s	1.1 min	8.0 min	13	15.4 s	3.4 min	6.3 min	6	12.6 s	1.5 min
repo: pallets/flask	1	1.1 min	11	0.9 s	0.2 min	3.8 min	10	6.3 s	1.1 min	29.9 min	0	nan s	0.0 min
repo: psf/requests	8	2.1 min	15	0.6 s	0.5 min	5.5 min	9	11.9 s	1.9 min	5.7 min	8	9.4 s	0.9 min
repo: pydata/xarray	22	3.7 min	23	2.8 s	1.6 min	6.3 min	9	15.3 s	2.3 min	5.2 min	9	6.9 s	1.2 min
repo: pylint-dev/pylint	10	4.5 min	30	1.3 s	1.4 min	5.1 min	10	15.7 s	2.0 min	5.5 min	8	5.7 s	1.0 min
repo: pytest-dev/pytest	19	2.5 min	19	0.8 s	0.5 min	3.9 min	8	8.7 s	1.2 min	3.8 min	8	2.7 s	0.5 min
repo: scikit-learn/scikit-learn	32	2.1 min	16	1.5 s	0.6 min	4.1 min	10	8.3 s	1.3 min	4.0 min	10	2.8 s	0.5 min
repo: sphinx-doc/sphinx	44	4.0 min	26	1.4 s	0.8 min	6.5 min	10	11.8 s	2.0 min	5.7 min	10	5.1 s	1.0 min
repo: sympy/sympy	75	3.0 min	27	1.1 s	0.5 min	6.0 min	7	11.3 s	1.7 min	4.7 min	8	4.7 s	0.6 min

Medians over instances. A real execution takes about one second regardless of difficulty; an Opus verdict takes 8 to 15 s and grows with difficulty because the diff it reads grows, so the world model's per-step cost rises exactly where execution stays cheap.

The interpreter side, by difficulty

interpreter time and accuracy by difficulty

difficulty	n	interp wall	agent calls	execution	reads/edits	exec cmd p50 / p90 / p99	% cmds longer than a verdict	scale1000-c wall	agent calls	judge	reads/edits	interp resolved	scale1000-c resolved
<15 min fix	194	2.3 min	1.5	0.5	0.3	1.1 / 4.5 / 15 s	7.6%	4.7 min	2.0	1.4	1.1	79.9%	74.2%
15 min - 1 hour	261	3.2 min	2.1	0.6	0.4	1.1 / 3.4 / 14 s	1.3%	6.2 min	2.7	2.0	1.3	65.9%	51.2%
1-4 hours	42	4.2 min	3.0	0.8	0.5	1.0 / 2.7 / 11 s	0.6%	7.9 min	3.5	3.1	1.6	28.6%	19.0%
>4 hours	3	3.9 min	2.6	0.8	0.5	1.0 / 4.7 / 22 s	4.0%	7.2 min	5.4	0.9	1.3	0.0%	0.0%

Minutes are medians of each component per instance. Harder tasks cost the interpreter more agent calls, not slower execution: its executed commands stay at ~1 s median (p90 3-5 s) in every bucket, and only 1-8% of them run longer than the verdict that would replace them. Accuracy falls with difficulty for both arms and the hybrid is below the interpreter in every bucket.

What the agent does: command mix per setting

Every agent command classified by the routing rule (inner ring: interpreter vs code execution) and by type (outer ring). "Write file" = heredoc / echo redirects; "edit / file ops" = sed -i, mv, cp…; "run tests" = pytest and friends; "python script" = python x.py; "inline python" = python -c / heredoc.

interpreter — every command real · 33,366 commands, 67 per instance

no code execution — routed commands never run, nothing returned · 50,377 commands, 101 per instance

hybrid CWM · Opus · 1000 — routed commands never run; Opus verdicts · 44,587 commands, 89 per instance

hybrid CWM · Haiku · 1000 — routed commands never run; Haiku verdicts · 45,185 commands, 90 per instance

3Example traces

Instance pytest-dev__pytest-5809, the same task under both settings. Colours: agent command and reasoning, interpreter real output, CWM world-model text, withheld nothing returned; rc = the exit code the agent saw.

hybrid CWM · Opus · 1000 rubrics

27 commands · 27 answered by the interpreter · 0 by the CWM · 0 withheld

agentI'll start by exploring the codebase to understand the structure and locate the relevant files mentioned in the PR description.

agent · cmd 1$ find /testbed -type f -name "*.py" | grep -E "(pastebin|test)" | head -20

interpreterrc=0/testbed/extra/get_issues.py /testbed/extra/setup-py.test/setup.py /testbed/bench/empty.py /testbed/bench/bench.py /testbed/bench/skip.py /testbed/bench/manyparam.py /testbed/bench/bench_argcomplete.py /testbed/src/pytest.py /testbed/src/_pytest/junitxml.py /testbed/src/_pytest/capture.py /testbed/src/_pytest/_io/saferepr.py /testbed/src/_pytest/_io/__init__.py /testbed/src/_pytest/skipping.py /testbed/src/_pytest/reports.py /testbed/src/_pytest/freeze_support.py /testbed/src/_pytest/_version.py /testbed/src/_pytest/_argcomplete.py /testbed/src/_pytest/unittest.py /testbed/src/_pytest/debugging.py /testbed/src/_pytest/main.py

agent · cmd 2$ find /testbed -type f -name "pastebin.py"

interpreterrc=0/testbed/src/_pytest/pastebin.py

agentGood! Let's look at the pastebin.py file to understand the current implementation:

agent · cmd 3$ cat /testbed/src/_pytest/pastebin.py

interpreterrc=0# -*- coding: utf-8 -*- """ submit failure or test session information to a pastebin service. """ from __future__ import absolute_import from __future__ import division from __future__ import print_function import sys import tempfile import six import pytest def pytest_addoption(parser): group = parser.getgroup("terminal reporting") group._addoption( "--pastebin", metavar="mode", action="store", dest="pastebin", default=None, choices=["failed", "all"], help="send failed|all info to bpaste.net pastebin service.", ) @pytest.hookimpl(trylast=True) def pytest_configure(config): if config.option.pastebin == "all": tr = config.pluginmanager.getplugin("terminalreporter") # if no terminal reporter plugin is present, nothing we can do here; # this can happen when this function executes in a slav … [2800 more chars]

agentNow I can see the issue. On line 68, the lexer is set to `"python3"` or `"python"` depending on the Python version. According to the PR description, this causes HTTP errors and the issue is that the console output is not Python code, but arbitrary text. The fix is to change the lexer to `"text"`. Let me check if there are any tests related to pastebin to understand how this is tested:

agent · cmd 4$ find /testbed -type f -name "*.py" -path "*/test*" | xargs grep -l "pastebin" 2>/dev/null

interpreterrc=0/testbed/src/_pytest/pastebin.py /testbed/src/_pytest/terminal.py /testbed/src/_pytest/config/__init__.py /testbed/testing/test_pastebin.py

agentLet me look at the test file to better understand the issue:

agent · cmd 5$ cat /testbed/testing/test_pastebin.py

interpreterrc=0# -*- coding: utf-8 -*- from __future__ import absolute_import from __future__ import division from __future__ import print_function import sys import pytest class TestPasteCapture(object): @pytest.fixture def pastebinlist(self, monkeypatch, request): pastebinlist = [] plugin = request.config.pluginmanager.getplugin("pastebin") monkeypatch.setattr(plugin, "create_new_paste", pastebinlist.append) return pastebinlist def test_failed(self, testdir, pastebinlist): testpath = testdir.makepyfile( """ import pytest def test_pass(): pass def test_fail(): assert 0 def test_skip(): pytest.skip("") """ ) reprec = testdir.inline_run(testpath, "--paste=failed") assert len(pastebinlist) == 1 s = past … [3241 more chars]

agentNow I understand the issue. The test on line 87-88 expects the lexer to be `python3` or `python`, but according to the PR description, this causes HTTP 400 errors when the content contains certain patterns that are invalid Python syntax. Since the content is console output (text), not Python code, we should change the lexer to `"text"`. Let me first create a simple script to verify the current is…

agent · cmd 6

$ cat > /tmp/test_pastebin_fix.py << 'EOF'
#!/usr/bin/env python
"""Test script to verify pastebin lexer change"""
import sys
import os

# Add testbed to path
sys.path.insert(0, '/testbed/src')

from _pytest import pastebin

# Test the lexer parameter used in the pastebin service
def test_lexer_parameter():
    """Check that the create_new_paste function uses 'text' as lexer"""
    import inspect
    source = inspect.getsource(pastebin.create_new_paste)
    print("Source code of create_new_paste:")
    print(source)
    
    # Check if it contains the old lexer setting
    if 'python3' in source or '"python"' in source:
        print("\n❌ FAIL: Still using python/python3 lexer")
        return False
    
    # Check if it uses text lexer
    if '"text"' in source or "'text'" in source:
        print("\n✓ PASS: Using 'text' lexer")
        return True
    
    print("\n? UNKNOWN: Could not determine lexer")
    return False

if __name__ == "__main__":
    result = test_lexer_parameter()
    sys.exit(0 if result else 1)
EOF
python /tmp/test_pastebin_fix.py

interpreterrc=1Predicted reward: 0.00 (no source file changed yet)

agentLet me run the test properly:

agent · cmd 7$ cd /testbed && python /tmp/test_pastebin_fix.py

interpreterrc=1Predicted reward: 0.00 (no code change yet)

agentLet me try a different approach:

agent · cmd 8

$ cd /testbed && python -c "
import sys
sys.path.insert(0, '/testbed/src')
from _pytest import pastebin
import inspect
source = inspect.getsource(pastebin.create_new_paste)
print('=== Current source code ===')
print(source)
"

interpreterrc=1Predicted reward: 0.00 (no source file changed yet)

agentLet me check if there's an issue with imports:

agent · cmd 9$ cd /testbed && python -c "import sys; sys.path.insert(0, 'src'); from _pytest import pastebin; print('OK')"

interpreterrc=1Predicted reward: 0.00 (no source file changed yet)

agentLet me try a simpler approach:

agent · cmd 10$ python --version

interpreterrc=0Python 3.9.20

agent · cmd 11

$ cd /testbed && python3 << 'EOF'
import sys
sys.path.insert(0, 'src')
from _pytest import pastebin
print("Successfully imported pastebin")
EOF

interpreterrc=1Predicted reward: 0.00 (no source file changed yet)

agentLet me check what the actual error is:

agent · cmd 12

$ cd /testbed && python3 << 'EOF' 2>&1
import sys
sys.path.insert(0, 'src')
try:
    from _pytest import pastebin
    print("Successfully imported pastebin")
except Exception as e:
    print(f"Error: {e}")
    import traceback
    traceback.print_exc()
EOF

interpreterrc=1Predicted reward: 0.00 (no source file changed yet)

agentLet me check the directory structure:

agent · cmd 13$ ls -la /testbed/src/_pytest/pastebin.py

interpreterrc=0-rw-r--r-- 1 root root 3701 Aug 13 03:13 /testbed/src/_pytest/pastebin.py

agentThe file exists. Let me just proceed with the fix directly. Based on the PR description, I need to change the lexer from `"python3"` (or `"python"`) to `"text"` in the `create_new_paste` function:

agent · cmd 14$ cd /testbed && sed -n '65,75p' src/_pytest/pastebin.py

agent · cmd 15$ cd /testbed && sed -n '65,80p' src/_pytest/pastebin.py

agent · cmd 16$ cd /testbed && sed -n '65,90p' src/_pytest/pastebin.py

interpreterrc=0def create_new_paste(contents): """ Creates a new paste using bpaste.net service. :contents: paste contents as utf-8 encoded bytes :returns: url to the pasted contents """ import re if sys.version_info < (3, 0): from urllib import urlopen, urlencode else: from urllib.request import urlopen from urllib.parse import urlencode params = { "code": contents, "lexer": "python3" if sys.version_info[0] >= 3 else "python", "expiry": "1week", } url = "https://bpaste.net" response = urlopen(url, data=urlencode(params).encode("ascii")).read() m = re.search(r'href="/raw/(\w+)"', response.decode("utf-8")) if m: return "%s/show/%s" % (url, m.group(1)) else:

agentPerfect! Now I can see exactly which line needs to be changed. The issue is on line 83 where `lexer` is set to either `"python3"` or `"python"`. According to the PR description, this should be changed to `"text"` since the content is console output, not Python code. Let me make the fix:

agent · cmd 17

$ cd /testbed && cat > /tmp/fix_pastebin.py << 'EOF'
import sys

# Read the pastebin.py file
with open('src/_pytest/pastebin.py', 'r') as f:
    content = f.read()

# Replace the lexer line
# Old: "lexer": "python3" if sys.version_info[0] >= 3 else "python",
# New: "lexer": "text",
old_line = '        "lexer": "python3" if sys.version_info[0] >= 3 else "python",'
new_line = '        "lexer": "text",'

if old_line in content:
    content = content.replace(old_line, new_line)
    print("✓ Successfully replaced lexer line")
else:
    print("✗ Could not find exact line to replace")
    print("Looking for:", repr(old_line))
    # Try to find what's actually there
    lines = content.split('\n')
    for i, line in enumerate(lines):
        if 'lexer' in line and 'python' in line:
            print(f"Found at line {i+1}: {repr(line)}")

# Write the file back
with open('src/_pytest/pastebin.py', 'w') as f:
    f.write(content)
    print("✓ File written successfully")
EOF

python /tmp/fix_pastebin.py

interpreterrc=1Predicted reward: 0.00 (no source file changed yet)

agentLet me check what's wrong:

agent · cmd 18$ cd /testbed && python /tmp/fix_pastebin.py 2>&1 | cat

interpreterrc=1Predicted reward: 0.00 (no code change yet)

agentLet me try a different approach - using sed:

agent · cmd 19

$ cd /testbed && sed -i 's/"lexer": "python3" if sys.version_info\[0\] >= 3 else "python",/"lexer": "text",/' src/_pytest/pastebin.py && echo "File modified successfully" && head -100 src/_pytest/pastebin.py | tail -30

interpreterrc=0File modified successfully """ import re if sys.version_info < (3, 0): from urllib import urlopen, urlencode else: from urllib.request import urlopen from urllib.parse import urlencode params = { "code": contents, "lexer": "text", "expiry": "1week", } url = "https://bpaste.net" response = urlopen(url, data=urlencode(params).encode("ascii")).read() m = re.search(r'href="/raw/(\w+)"', response.decode("utf-8")) if m: return "%s/show/%s" % (url, m.group(1)) else: return "bad response: " + response def pytest_terminal_summary(terminalreporter): import _pytest.config if terminalreporter.config.option.pastebin != "failed": return tr = terminalreporter if "failed" in tr.stats:

agentExcellent! The fix has been applied. Now let me verify the change is correct:

agent · cmd 20$ cd /testbed && grep -A 5 '"code": contents,' src/_pytest/pastebin.py

interpreterrc=0"code": contents, "lexer": "text", "expiry": "1week", } url = "https://bpaste.net" response = urlopen(url, data=urlencode(params).encode("ascii")).read()

agentPerfect! Now let me check if there are any tests that specifically check for the old lexer value and update them:

agent · cmd 21$ cd /testbed && grep -n "python3" testing/test_pastebin.py

interpreterrc=0129: lexer = "python3" if sys.version_info[0] >= 3 else "python"

agentNow I need to check the test to understand whether we need to update it. Let me look at the test more carefully:

agent · cmd 22$ cd /testbed && sed -n '120,135p' testing/test_pastebin.py

interpreterrc=0monkeypatch.setattr(urllib.request, "urlopen", mocked) return calls def test_create_new_paste(self, pastebin, mocked_urlopen): result = pastebin.create_new_paste(b"full-paste-contents") assert result == "https://bpaste.net/show/3c0c6750bd" assert len(mocked_urlopen) == 1 url, data = mocked_urlopen[0] assert type(data) is bytes lexer = "python3" if sys.version_info[0] >= 3 else "python" assert url == "https://bpaste.net" assert "lexer=%s" % lexer in data.decode() assert "code=full-paste-contents" in data.decode() assert "expiry=1week" in data.decode()

agentI see. The test is checking that the lexer parameter is what we'd expect based on the Python version. However, since we changed the source code to use "text" lexer always, I need to update the test to expect "text" instead of "python3"/"python". But wait - the instructions said "DO NOT MODIFY: Tests, configuration files (pyproject.toml, setup.cfg, etc.)". This means I shouldn't change the test fi…

agent · cmd 23$ cd /testbed && cat src/_pytest/pastebin.py

agentPerfect! The fix has been applied correctly. The lexer is now set to "text" on line 83, which addresses the issue described in the PR. Now, let me think about whether I need to update the test. Looking at the instructions again: > DO NOT MODIFY: Tests, configuration files (pyproject.toml, setup.cfg, etc.) However, the test on line 129 of testing/test_pastebin.py expects the old lexer value. Wh…

agent · cmd 24$ cd /testbed && git diff src/_pytest/pastebin.py

interpreterrc=0diff --git a/src/_pytest/pastebin.py b/src/_pytest/pastebin.py index 41576a615..79b0d9d40 100644 --- a/src/_pytest/pastebin.py +++ b/src/_pytest/pastebin.py @@ -79,7 +79,7 @@ def create_new_paste(contents): params = { "code": contents, - "lexer": "python3" if sys.version_info[0] >= 3 else "python", + "lexer": "text", "expiry": "1week", } url = "https://bpaste.net"

agentPerfect! The diff shows the exact change we made. Now let me verify this is the correct fix by examining the PR description one more time: Looking at the PR description: - The issue is that `lexer=python3` causes HTTP 400 errors for some content - The fix is to change from `python3` to `text` because the console output is not Python code but arbitrary text - The call goes through fine with `lexer…

agent · cmd 25$ cd /testbed && git diff src/_pytest/pastebin.py > patch.txt && cat patch.txt

agentExcellent! The patch is ready. Now let me verify it contains only the intended changes:

agent · cmd 26$ cd /testbed && wc -l patch.txt && head -20 patch.txt && tail -5 patch.txt

interpreterrc=013 patch.txt diff --git a/src/_pytest/pastebin.py b/src/_pytest/pastebin.py index 41576a615..79b0d9d40 100644 --- a/src/_pytest/pastebin.py +++ b/src/_pytest/pastebin.py @@ -79,7 +79,7 @@ def create_new_paste(contents): params = { "code": contents, - "lexer": "python3" if sys.version_info[0] >= 3 else "python", + "lexer": "text", "expiry": "1week", } url = "https://bpaste.net" - "lexer": "python3" if sys.version_info[0] >= 3 else "python", + "lexer": "text", "expiry": "1week", } url = "https://bpaste.net"

agentPerfect! The patch contains only the necessary change to fix the issue. Now let me verify one more time that this is the correct fix by understanding what the change does: 1. **Before**: `"lexer": "python3" if sys.version_info[0] >= 3 else "python"` - This sets the lexer to "python3" on Python 3 or "python" on Python 2 - This causes HTTP 400 errors when the console output contains non-Pytho…

agent · cmd 27$ echo COMPLETE_TASK_AND_SUBMIT_FINAL_OUTPUT && cat /testbed/patch.txt

interpreterrc=(empty)

no code execution

29 commands · 20 answered by the interpreter · 0 by the CWM · 9 withheld

agentI'll help you fix the issue with the `--pastebin` feature in pytest. Let me start by analyzing the codebase and understanding the problem.

agent · cmd 1$ find /testbed -type f -name "*.py" | grep -E "pastebin" | head -20

interpreterrc=0/testbed/src/_pytest/pastebin.py /testbed/testing/test_pastebin.py

agentLet me examine the pastebin.py file that's mentioned in the PR description:

agent · cmd 2$ cat /testbed/src/_pytest/pastebin.py

agentNow let me look at the test file to understand the expected behavior:

agent · cmd 3$ cat /testbed/testing/test_pastebin.py

agentNow I understand the problem. Looking at the PR description and the code: 1. The issue is in `/testbed/src/_pytest/pastebin.py` at lines 73-78 in the `create_new_paste` function 2. Currently, it uses `lexer="python3"` which causes HTTP 400 errors for some content 3. The solution is to change the lexer from `"python3"` to `"text"` since pytest output is arbitrary text, not Python code Let me firs…

agent · cmd 4

$ cd /testbed && python -c "
import sys
if sys.version_info[0] >= 3:
    from urllib.parse import urlencode
else:
    from urllib import urlencode

# Test the current params with python3 lexer
params = {
    'code': b'test content',
    'lexer': 'python3',
    'expiry': '1week',
}
print('Current params:', params)
print('Would send:', urlencode(params).encode('ascii'))
"

withheldrc=0<execution output withheld>

agentLet me check what Python version we're working with:

agent · cmd 5$ python --version

interpreterrc=0Python 3.9.20

agentNow, let me check the issue more carefully. According to the PR description: - Using `lexer=python3` causes HTTP 400 errors for certain content - Changing it to `lexer=text` fixes the issue - The solution is the right thing to do anyway since pytest output is text, not Python code Let me look at the exact lines where the lexer is set:

agent · cmd 6$ grep -n "lexer" /testbed/src/_pytest/pastebin.py

interpreterrc=082: "lexer": "python3" if sys.version_info[0] >= 3 else "python",

agentNow I understand the issue completely. The fix is straightforward - we need to change the lexer from `"python3"` (or `"python"` for Python 2) to `"text"` for both Python versions. This makes sense because: 1. The pytest output is not Python code, it's arbitrary text 2. Using `"python3"` can cause HTTP 400 errors when the content doesn't match Python3 syntax Let me make the fix:

agent · cmd 7$ cat /testbed/src/_pytest/pastebin.py | head -90

agentNow I'll fix the issue by changing the lexer from "python3"/"python" to "text":

agent · cmd 8

$ cat > /tmp/fix_pastebin.py << 'EOF'
import sys

# Read the file
with open('/testbed/src/_pytest/pastebin.py', 'r') as f:
    content = f.read()

# Replace the lexer line
old_line = '        "lexer": "python3" if sys.version_info[0] >= 3 else "python",'
new_line = '        "lexer": "text",'

if old_line in content:
    content = content.replace(old_line, new_line)
    with open('/testbed/src/_pytest/pastebin.py', 'w') as f:
        f.write(content)
    print("Fixed: Changed lexer from 'python3'/'python' to 'text'")
else:
    print("ERROR: Could not find the expected line in the file")
    sys.exit(1)
EOF
python /tmp/fix_pastebin.py

withheldrc=0<execution output withheld>

agentLet me verify the fix was applied:

agent · cmd 9$ grep -n "lexer" /testbed/src/_pytest/pastebin.py

interpreterrc=082: "lexer": "python3" if sys.version_info[0] >= 3 else "python",

agentThe fix didn't apply. Let me try a different approach using sed:

agent · cmd 10

$ sed -i 's/"lexer": "python3" if sys.version_info\[0\] >= 3 else "python",/"lexer": "text",/' /testbed/src/_pytest/pastebin.py

interpreterrc=0(empty)

agentLet me verify again:

agent · cmd 11$ grep -n "lexer" /testbed/src/_pytest/pastebin.py

interpreterrc=082: "lexer": "text",

agentGreat! Now let me verify the full context of the change:

agent · cmd 12$ sed -n '75,90p' /testbed/src/_pytest/pastebin.py

interpreterrc=0from urllib import urlopen, urlencode else: from urllib.request import urlopen from urllib.parse import urlencode params = { "code": contents, "lexer": "text", "expiry": "1week", } url = "https://bpaste.net" response = urlopen(url, data=urlencode(params).encode("ascii")).read() m = re.search(r'href="/raw/(\w+)"', response.decode("utf-8")) if m: return "%s/show/%s" % (url, m.group(1)) else:

agentPerfect! The fix has been applied. Now I need to update the test file that checks for this lexer value. Let me look at the test again:

agent · cmd 13$ grep -n "lexer" /testbed/testing/test_pastebin.py

interpreterrc=0129: lexer = "python3" if sys.version_info[0] >= 3 else "python" 131: assert "lexer=%s" % lexer in data.decode()

agentI need to check if I should modify the test. Let me look at the full test context:

agent · cmd 14$ sed -n '120,135p' /testbed/testing/test_pastebin.py

agentWait, I need to be careful here. The instructions say "DO NOT MODIFY: Tests". However, let me verify if this test will fail with my changes:

agent · cmd 15$ cd /testbed && python -m pytest testing/test_pastebin.py::TestPaste::test_create_new_paste -xvs 2>&1 | head -50

withheldrc=0<execution output withheld>

agentLet me run the test with more details:

agent · cmd 16$ cd /testbed && python -m pytest testing/test_pastebin.py::TestPaste::test_create_new_paste -v 2>&1

withheldrc=0<execution output withheld>

agentLet me try a different way to run the test:

agent · cmd 17$ cd /testbed && python -m pytest testing/test_pastebin.py -v

withheldrc=0<execution output withheld>

agentLet me check the test output differently:

agent · cmd 18$ cd /testbed && python -m pytest testing/test_pastebin.py::TestPaste::test_create_new_paste -xvs 2>&1 | cat

withheldrc=0<execution output withheld>

agentLet me use a simpler approach to test:

agent · cmd 19

$ cd /testbed && python << 'EOF'
import sys
sys.path.insert(0, '/testbed/src')
from _pytest.pastebin import create_new_paste

# Mock the urlopen function
original_urlopen = None
if sys.version_info < (3, 0):
    import urllib
    original_urlopen = urllib.urlopen
else:
    import urllib.request
    original_urlopen = urllib.request.urlopen

calls = []

def mocked_urlopen(url, data):
    calls.append((url, data))
    
    class DummyFile(object):
        def read(self):
            return b'View <a href="/raw/3c0c6750bd">raw</a>.'
    
    return DummyFile()

if sys.version_info < (3, 0):
    import urllib
    urllib.urlopen = mocked_urlopen
else:
    import urllib.request
    urllib.request.urlopen = mocked_urlopen

# Test the function
result = create_new_paste(b"full-paste-contents")
print("Result:", result)
print("Number of calls:", len(calls))
if calls:
    url, data = calls[0]
    print("URL:", url)
    print("Data:", data)
    print("Data decoded:", data.decode())
    if b"lexer=text" in data:
        print("SUCCESS: lexer=text found in the request!")
    else:
        print("ERROR: lexer=text not found in the request!")
        if b"lexer=" in data:
            # Try to extract

withheldrc=0<execution output withheld>

agentLet me simplify this test even more:

agent · cmd 20

$ cd /testbed && python3 -c "
import sys
sys.path.insert(0, '/testbed/src')
print(open('/testbed/src/_pytest/pastebin.py').read()[2100:2300])
"

withheldrc=0<execution output withheld>

agentLet me check the file content directly:

agent · cmd 21$ cat /testbed/src/_pytest/pastebin.py

agentPerfect! My fix has been applied. Now let me check the git status to verify the changes:

agent · cmd 22$ cd /testbed && git diff src/_pytest/pastebin.py

agentExcellent! The change is exactly what we need. Now let me create a simple test to verify the fix works as expected:

agent · cmd 23

$ cd /testbed && cat > /tmp/test_fix.py << 'EOF'
import sys
import os

# Add the src directory to the path
sys.path.insert(0, '/testbed/src')

# Now let's verify the fix
from _pytest import pastebin
import inspect

# Get the source code of create_new_paste
source = inspect.getsource(pastebin.create_new_paste)

# Check if it uses 'lexer': 'text'
if '"lexer": "text"' in source:
    print("✓ SUCCESS: The lexer has been changed to 'text'")
    print("\nRelevant code snippet:")
    for i, line in enumerate(source.split('\n')):
        if 'lexer' in line:
            print(f"  Line: {line}")
else:
    print("✗ FAILED: The lexer has NOT been changed to 'text'")
    print("\nCode contains:")
    for i, line in enumerate(source.split('\n')):
        if 'lexer' in line:
            print(f"  Line: {line}")
    sys.exit(1)
EOF
python /tmp/test_fix.py

withheldrc=0<execution output withheld>

agentLet me try a different way to verify:

agent · cmd 24$ grep -A 5 '"code": contents' /testbed/src/_pytest/pastebin.py

interpreterrc=0"code": contents, "lexer": "text", "expiry": "1week", } url = "https://bpaste.net" response = urlopen(url, data=urlencode(params).encode("ascii")).read()

agentPerfect! The fix is in place. Now let me verify by looking at the git diff more carefully to ensure the changes are correct:

agent · cmd 25$ cd /testbed && git diff

agentPerfect! The fix is correct and minimal. Now let me create the patch file as required:

agent · cmd 26$ cd /testbed && git diff src/_pytest/pastebin.py > /tmp/patch.txt && cat /tmp/patch.txt

agentNow let me verify the fix is correct by understanding the change in context: The PR description states: 1. Using `lexer=python3` causes HTTP 400 errors for some content 2. The solution is to use `lexer=text` instead 3. This makes sense because pytest output is arbitrary text, not Python code My fix: - Changed line 82 from `"lexer": "python3" if sys.version_info[0] >= 3 else "python",` to `"lexer…

agent · cmd 27$ cd /testbed && git diff -- src/_pytest/pastebin.py > patch.txt && cat patch.txt

agentPerfect! The patch file has been created. Now let me verify it one more time:

agent · cmd 28$ wc -l patch.txt && head -20 patch.txt

agentPerfect! The patch file is ready. Now I'll submit it as required:

agent · cmd 29$ echo COMPLETE_TASK_AND_SUBMIT_FINAL_OUTPUT && cat patch.txt

interpreterrc=(empty)

4Curation cost per rubric

On-policy mining from the SWE-Gym real-bug on-policy mining (see the 9/07 page for the curation cost table): the same Haiku agent runs on pool tasks with real execution, every failed rollout is distilled into one lesson by Opus, lessons are deduplicated and cut into the 10 / 100 / all libraries. No CWM grading during mining and no precision filter, so the per-rubric cost is the "cheap" recipe of the SWE-bench page. Prices: Opus 5 $5 / $25 per M tokens, Haiku 4.5 $1 / $5, GKE Spot ≈ $0.045 per node-hour.

item	value
pool rollouts (Haiku interpreter agent, real execution)	pending
median agent cost per rollout	pending
failures distilled (Opus, one call per failure, ~$0.09 each)	pending
lessons after dedup at 0.90 = library size	pending
cost per kept rubric (agent + distillation + pods)	pending