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CodingAgentBench

copilot × stepfun-ai/step-3.5-flash

mutations
mutations/java-null-deref

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/java-null-deref
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
2026-06-17T01:40:24.734062Z
ended_at
2026-06-17T01:41:00.862894Z
duration
36.13 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":"ok values win over defaults\nok fallback to defaults\nok missing returns null\nok nullDefaultsReturnsNull\nok values still work with null defaults\nok null values, key in defaults\nok null values, missing key\nall tests passed\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":36128.832,"container_active_ms":36116.672999999995,"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/Config.java"],"unexpected_changes":[],"expected_changes":["src/Config.java"],"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/java-null-deref"}
composite composite, weights, components, note {"composite":0.9401457228195219,"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":36128.832,"expected_refusal":false,"refusal_produced":false,"cost_efficiency":1,"latency_efficiency":0.600971485463479,"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 / 36.13 s
span 9d8c34eafd534bb0853101d42b01194btask_setupprepare:mutations/java-null-deref0 ms → 11 ms
workdir/home/andrew/.codingagentbench-scratch/codingagentbench-copilot-mutations_java-null-deref-pvike4gu/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/java-null-deref

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/java-null-deref
# 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
9d8c34eafd534bb0853101d42b01194b task_setup prepare:mutations/java-null-deref 11 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-copilot-mutations_java-null-deref-pvike4gu/workdir","task_category":"mutations","plugin_stack":[],"behavior_mode":"factory"}
b4697bcc93904815a2c1a22b34f5ba95 ↳ 057679c01143404ba7abadac56adfd90 tool_call applied_plugins 0 ms {"tui":"copilot","count":0,"applied":[],"env_keys":[],"extra_args":[],"applied_count":0,"skipped_count":0}
71437641e71540f9aa7dff000f3d9929 ↳ 057679c01143404ba7abadac56adfd90 container copilot:launch 36116 ms {"image":"codingagentbench/copilot:v1.0.63","argv":["-p","Critical null guard deleted before defaults.get() — NPE on caller-supplied null defaults","--allow-all"],"timeout_s":600,"exit_code":0,"duration_s":36.101778593991185,"timed_out":false}
057679c01143404ba7abadac56adfd90 adapter_run copilot:mutations/java-null-deref 36117 ms {"timeout_s":600,"plugin_stack":[],"exit_code":0}
375f83ac32c24d748b93b47f58b7f4b9 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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Other models with this CLI

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[![CodingAgentBench: copilot × stepfun-ai/step-3.5-flash 94%](https://codingagentbench.com/badge/copilot/stepfun-ai/step-3.5-flash/mutations/java-null-deref.svg)](https://codingagentbench.com/cell/copilot/stepfun-ai/step-3.5-flash/mutations/java-null-deref)
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<a href="https://codingagentbench.com/cell/copilot/stepfun-ai/step-3.5-flash/mutations/java-null-deref"><img src="https://codingagentbench.com/badge/copilot/stepfun-ai/step-3.5-flash/mutations/java-null-deref.svg" alt="CodingAgentBench: copilot × stepfun-ai/step-3.5-flash 94%" /></a>
CodingAgentBench: copilot × stepfun-ai/step-3.5-flash 94%