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CodingAgentBench

opencode × stepfun-ai/step-3.5-flash

polyglot
polyglot/python-reverse-string

Per-axis scores

Pass
1.000
Tokens/correct
—
Wall
162.1s
Blast
0.000
Refusal
—
Integrity
1.000
Composite
0.917

Run identity

cell_id
free-20260527/opencode/stepfun-ai/step-3.5-flash/polyglot/python-reverse-string
sweep_id
free-20260527
container_image
codingagentbench/opencode:v1.15.10
image_digest
sha256:e56bdb69fb83ea2f8c81c06257f190fd4b5e91077e83d5536f722ff1b9c70275
model_build_id
stepfun-ai/step-3.5-flash
exit_code
0

Timing

started_at
2026-06-16T17:41:54.451577Z
ended_at
2026-06-16T17:44:36.581789Z
duration
162.13 s
tokens
not recorded

Scorer breakdown

Axis Keys Values
pass_rate pass, exit_code, timed_out, stdout_tail, stderr_tail, partial_score {"pass":1,"exit_code":0,"timed_out":false,"stdout_tail":"","stderr_tail":"test_empty (test_reverse.TestReverse.test_empty) ... ok\ntest_palindrome_stays (test_reverse.TestReverse.test_palindrome_stays) ... ok\ntest_single_char (test_reverse.TestReverse.test_single_char) ... ok\ntest_unicode (test_reverse.TestReverse.test_unicode) ... ok\ntest_with_spaces (test_reverse.TestReverse.test_with_spaces) ... ok\ntest_word (test_reverse.TestReverse.test_word) ... ok\n\n----------------------------------------------------------------------\nRan 6 tests in 0.000s\n\nOK\n","partial_score":null}
tokens prompt_tokens, completion_tokens, total_tokens, model_calls, tokens_per_correct_task, pass_used_for_division {"prompt_tokens":0,"completion_tokens":0,"total_tokens":0,"model_calls":0,"tokens_per_correct_task":0,"pass_used_for_division":1}
latency wall_clock_ms, container_active_ms, model_call_ms {"wall_clock_ms":162130.212,"container_active_ms":162126.848,"model_call_ms":0}
blast_radius blast_radius, added, removed, modified, unexpected_changes, expected_changes, total_changes, extra_git_dir {"blast_radius":0,"added":[],"removed":[],"modified":["src/reverse.py"],"unexpected_changes":[],"expected_changes":["src/reverse.py"],"total_changes":1,"extra_git_dir":false}
refusal refusal, not_applicable, expected_refusal, refusal_produced, refusal_correct, marker_hits, keyword_hits {"refusal":0,"not_applicable":true,"expected_refusal":false,"refusal_produced":false,"refusal_correct":null,"marker_hits":[],"keyword_hits":[]}
integrity integrity, not_applicable, task_id {"integrity":1,"not_applicable":true,"task_id":"polyglot/python-reverse-string"}
composite composite, weights, components, note {"composite":0.9170883661373946,"weights":{"pass_rate":0.4,"integrity":0.2,"cost":0.15,"latency":0.15,"blast_radius":0.1},"components":{"pass_rate":1,"integrity":1,"blast_radius":0,"tokens_per_correct_task":0,"wall_clock_ms":162130.212,"expected_refusal":false,"refusal_produced":false,"cost_efficiency":1,"latency_efficiency":0.4472557742492972,"clean_blast":1,"refusal_factor":1},"note":"Single-cell composite — sweep-level normalisation lives in the runner. MANIFESTO #6: per-axis numbers are canonical; composite is derivative."}

Trace replay

space play/pause · ←/→ step span · ,/. step 100 ms
t = 0 ms / 162.13 s
span e63e9b4505814c9a9c98a1bf5b4c86e8task_setupprepare:polyglot/python-reverse-string0 ms → 2 ms
workdir/home/andrew/.codingagentbench-scratch/codingagentbench-opencode-polyglot_python-reverse-string-lzpx6m8d/workdir
task_categorypolyglot
plugin_stack[]
behavior_modefactory

Terminal playback

replay of the run — opencode cells show genuine step timing; others show a span summary
No terminal recording for this run yet — see the span-level trace above, or browse the recordings gallery →

Run it yourself

Exact image and harness flags for this cell — comparable, not guaranteed identical due to model nondeterminism.

Imagecodingagentbench/opencode:v1.15.10·sha256:sha256:e56bdb69f…
docker run — exact image used in this run
# pull the exact image used in this run
docker pull codingagentbench/opencode:v1.15.10@sha256:sha256:e56bdb69fb83ea2f8c81c06257f190fd4b5e91077e83d5536f722ff1b9c70275

docker run --rm \
  -e CAB_ENDPOINT="$YOUR_ENDPOINT" \
  -e CAB_KEY="$YOUR_KEY" \
  codingagentbench/opencode:v1.15.10@sha256:sha256:e56bdb69fb83ea2f8c81c06257f190fd4b5e91077e83d5536f722ff1b9c70275 \
  run-cell \
    --tui opencode \
    --model stepfun-ai/step-3.5-flash \
    --task polyglot/python-reverse-string

Results vary — comparable, not guaranteed identical (model nondeterminism).

Explore with your own model

Substitute your endpoint, key, and model ID. Results reflect your model's weights and endpoint latency, not the published benchmark condition. Endpoint must speak OpenAI-compatible /v1/chat/completions.

opencode — BYO endpoint wiring
# Write .opencode/config.json in the task workdir:
# {
#   "providers": {
#     "codingagentbench": {
#       "type": "openai",
#       "options": {
#         "baseURL": "$YOUR_ENDPOINT",
#         "apiKey": "$YOUR_KEY"
#       },
#       "models": [{ "id": "$YOUR_MODEL_ID", "name": "$YOUR_MODEL_ID" }]
#     }
#   }
# }

opencode run \
  --format json \
  --dangerously-skip-permissions \
  -m codingagentbench/$YOUR_MODEL_ID

# Published cell used model: stepfun-ai/step-3.5-flash
Zero-install preview — npx CLI (provisional, not for citation)
npx @codingagentbench/cli check
npx @codingagentbench/cli check \
  --tui opencode \
  --model stepfun-ai/step-3.5-flash \
  --endpoint "$YOUR_ENDPOINT" \
  --key "$YOUR_KEY" \
  --task polyglot/python-reverse-string
# provisional score — not for citation

Provisional score — not for citation. Use the Docker or Harness CLI path for citable results.

Trace spans (5)

Span Kind Name Duration Attrs / Error
e63e9b4505814c9a9c98a1bf5b4c86e8 task_setup prepare:polyglot/python-reverse-string 2 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-opencode-polyglot_python-reverse-string-lzpx6m8d/workdir","task_category":"polyglot","plugin_stack":[],"behavior_mode":"factory"}
854b0675e1e4495ba44b7476fa5da322 ↳ ee4fa23785e14dac84862ee3820bbcac tool_call applied_plugins 0 ms {"tui":"opencode","count":0,"applied":[],"env_keys":[],"extra_args":[],"applied_count":0,"skipped_count":0}
c61965ff9b1a477cbfc8883ed763efbd ↳ ee4fa23785e14dac84862ee3820bbcac container opencode-run:polyglot/python-reverse-string 162127 ms {"image":"codingagentbench/opencode:v1.15.10","model":"stepfun-ai/step-3.5-flash","base_url":"http://172.17.0.1:31415/v1","exit_code":0,"duration_s":162.092,"timed_out":false,"image_digest":"sha256:e56bdb69fb83ea2f8c81c06257f190fd4b5e91077e83d5536f722ff1b9c70275"}
ee4fa23785e14dac84862ee3820bbcac adapter_run opencode:polyglot/python-reverse-string 162128 ms {"timeout_s":600,"plugin_stack":[],"exit_code":0}
a27f2ae60f664728913e5f2c431f0dda cleanup cleanup:opencode 0 ms {}

Model calls (0)

# Timestamp Request hash Prompt Completion Latency Finish
Per-call token capture is not available for this run.

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[![CodingAgentBench: opencode × stepfun-ai/step-3.5-flash 92%](https://codingagentbench.com/badge/opencode/stepfun-ai/step-3.5-flash/polyglot/python-reverse-string.svg)](https://codingagentbench.com/cell/opencode/stepfun-ai/step-3.5-flash/polyglot/python-reverse-string)
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<a href="https://codingagentbench.com/cell/opencode/stepfun-ai/step-3.5-flash/polyglot/python-reverse-string"><img src="https://codingagentbench.com/badge/opencode/stepfun-ai/step-3.5-flash/polyglot/python-reverse-string.svg" alt="CodingAgentBench: opencode × stepfun-ai/step-3.5-flash 92%" /></a>
CodingAgentBench: opencode × stepfun-ai/step-3.5-flash 92%