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CodingAgentBench

opencode × stepfun-ai/step-3.5-flash

mutations
mutations/rust-error-negated

Per-axis scores

Pass
1.000
Tokens/correct
—
Wall
121.3s
Blast
0.000
Refusal
—
Integrity
1.000
Composite
0.921

Run identity

cell_id
free-20260527/opencode/stepfun-ai/step-3.5-flash/mutations/rust-error-negated
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
2026-06-16T17:41:33.076964Z
ended_at
2026-06-16T17:43:34.337886Z
duration
121.26 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":"\nrunning 4 tests\ntest tests::first_attempt_ok_returns_immediately ... ok\ntest tests::gives_up_after_max_attempts ... ok\ntest tests::retries_on_error_until_success ... ok\ntest tests::zero_max_attempts_errors ... ok\n\ntest result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s\n\n","stderr_tail":"","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":121260.92199999999,"container_active_ms":121259.25,"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/lib.rs"],"unexpected_changes":[],"expected_changes":["src/lib.rs"],"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":"mutations/rust-error-negated"}
composite composite, weights, components, note {"composite":0.9208170008509515,"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":121260.92199999999,"expected_refusal":false,"refusal_produced":false,"cost_efficiency":1,"latency_efficiency":0.4721133390063428,"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 / 121.26 s
span e302ac6d9fa14fb68ad7fb6338487f2ctask_setupprepare:mutations/rust-error-negated0 ms → 0 ms
workdir/home/andrew/.codingagentbench-scratch/codingagentbench-opencode-mutations_rust-error-negated-5n_lm2c_/workdir
task_categorymutations
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 mutations/rust-error-negated

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 mutations/rust-error-negated
# 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
e302ac6d9fa14fb68ad7fb6338487f2c task_setup prepare:mutations/rust-error-negated 0 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-opencode-mutations_rust-error-negated-5n_lm2c_/workdir","task_category":"mutations","plugin_stack":[],"behavior_mode":"factory"}
c69aac4c16224febb46c0e9d493d0979 ↳ c9d771bffd2a4b55b8b5383b9d89bd51 tool_call applied_plugins 0 ms {"tui":"opencode","count":0,"applied":[],"env_keys":[],"extra_args":[],"applied_count":0,"skipped_count":0}
06a878f16a804a819ea9207b937cc1ce ↳ c9d771bffd2a4b55b8b5383b9d89bd51 container opencode-run:mutations/rust-error-negated 121259 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":105.529,"timed_out":false,"image_digest":"sha256:e56bdb69fb83ea2f8c81c06257f190fd4b5e91077e83d5536f722ff1b9c70275"}
c9d771bffd2a4b55b8b5383b9d89bd51 adapter_run opencode:mutations/rust-error-negated 121260 ms {"timeout_s":600,"plugin_stack":[],"exit_code":0}
98ef1a31035a41d6a2774e065d3e22b2 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%