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CodingAgentBench

copilot × stepfun-ai/step-3.5-flash

mutations
mutations/go-binary-search-offbyone

Per-axis scores

Pass
1.000
Tokens/correct
—
Wall
36.1s
Blast
0.000
Refusal
—
Integrity
1.000
Composite
0.940

Run identity

cell_id
expansion-20260616/copilot/stepfun-ai/step-3.5-flash/mutations/go-binary-search-offbyone
sweep_id
expansion-20260616
container_image
codingagentbench/copilot:v1.0.63
image_digest
sha256:6ad0221187dc5c6de50c8aeec50b0eb8eab269c1a681c79efaaa068741a20607
model_build_id
stepfun-ai/step-3.5-flash
exit_code
0

Timing

started_at
2026-06-17T01:36:06.819727Z
ended_at
2026-06-17T01:36:42.943211Z
duration
36.12 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":"ok \tcodingagentbench/gobinarysearch\t0.002s\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":36123.484,"container_active_ms":36110.075000000004,"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":["search.go"],"unexpected_changes":[],"expected_changes":["search.go"],"total_changes":1,"extra_git_dir":true}
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/go-binary-search-offbyone"}
composite composite, weights, components, note {"composite":0.9401484507956287,"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":36123.484,"expected_refusal":false,"refusal_produced":false,"cost_efficiency":1,"latency_efficiency":0.6009896719708572,"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 / 36.12 s
span 24cf61557c154db5b97e86c96980685ftask_setupprepare:mutations/go-binary-search-offbyone0 ms → 13 ms
workdir/home/andrew/.codingagentbench-scratch/codingagentbench-copilot-mutations_go-binary-search-offbyone-01gplcfp/workdir
task_categorymutations
plugin_stack[]
behavior_modefactory

Terminal playback

replay of the run — opencode cells show genuine step timing; others show a span summary

Run it yourself

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

Imagecodingagentbench/copilot:v1.0.63·sha256:sha256:6ad022118…
docker run — exact image used in this run
# pull the exact image used in this run
docker pull codingagentbench/copilot:v1.0.63@sha256:sha256:6ad0221187dc5c6de50c8aeec50b0eb8eab269c1a681c79efaaa068741a20607

docker run --rm \
  -e CAB_ENDPOINT="$YOUR_ENDPOINT" \
  -e CAB_KEY="$YOUR_KEY" \
  codingagentbench/copilot:v1.0.63@sha256:sha256:6ad0221187dc5c6de50c8aeec50b0eb8eab269c1a681c79efaaa068741a20607 \
  run-cell \
    --tui copilot \
    --model stepfun-ai/step-3.5-flash \
    --task mutations/go-binary-search-offbyone

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.

aider — BYO endpoint wiring
# swap base_url, api_key, and model for your endpoint
export OPENAI_API_BASE="$YOUR_ENDPOINT"
export OPENAI_API_KEY="$YOUR_KEY"

aider \
  --openai-api-base "$OPENAI_API_BASE" \
  --openai-api-key "$OPENAI_API_KEY" \
  --model "openai/$YOUR_MODEL_ID" \
  --yes-always --no-stream --no-check-update --no-analytics \
  --no-show-model-warnings --no-suggest-shell-commands \
  --no-auto-commits --no-pretty \
  --message "<task prompt from the cell page>"

# 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 copilot \
  --model stepfun-ai/step-3.5-flash \
  --endpoint "$YOUR_ENDPOINT" \
  --key "$YOUR_KEY" \
  --task mutations/go-binary-search-offbyone
# 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
24cf61557c154db5b97e86c96980685f task_setup prepare:mutations/go-binary-search-offbyone 13 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-copilot-mutations_go-binary-search-offbyone-01gplcfp/workdir","task_category":"mutations","plugin_stack":[],"behavior_mode":"factory"}
b164e6d1c88c45dc8cec99827d70455b ↳ 968a07e5ff12462e8e16fcb7039ecc15 tool_call applied_plugins 1 ms {"tui":"copilot","count":0,"applied":[],"env_keys":[],"extra_args":[],"applied_count":0,"skipped_count":0}
b71938268024418c9141d9b2355879b1 ↳ 968a07e5ff12462e8e16fcb7039ecc15 container copilot:launch 36110 ms {"image":"codingagentbench/copilot:v1.0.63","argv":["-p","Off-by-one in iterative binary search: `<=` flipped to `<` skips rightmost elements","--allow-all"],"timeout_s":600,"exit_code":0,"duration_s":36.094611954002175,"timed_out":false}
968a07e5ff12462e8e16fcb7039ecc15 adapter_run copilot:mutations/go-binary-search-offbyone 36111 ms {"timeout_s":600,"plugin_stack":[],"exit_code":0}
58b944e13fbc48e0bf54da7994cfb4f1 cleanup cleanup:copilot 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: copilot × stepfun-ai/step-3.5-flash 94%