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CodingAgentBench

openhands × stepfun-ai/step-3.5-flash

mutations
mutations/java-null-deref

Per-axis scores

Pass
1.000
Tokens/correct
—
Wall
272.1s
Blast
0.667
Refusal
—
Integrity
1.000
Composite
0.845

Run identity

cell_id
free-20260527/openhands/stepfun-ai/step-3.5-flash/mutations/java-null-deref
sweep_id
free-20260527
container_image
codingagentbench/openhands:1.7.0
image_digest
sha256:7fcaf222644a5cb0afffe018f038d270130b5af3b8af366cd960f2d596a4342c
model_build_id
stepfun-ai/step-3.5-flash
exit_code
0

Timing

started_at
2026-06-16T19:05:37.658161Z
ended_at
2026-06-16T19:10:09.749884Z
duration
272.09 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":272091.723,"container_active_ms":272083.568,"model_call_ms":0}
blast_radius blast_radius, added, removed, modified, unexpected_changes, expected_changes, total_changes, extra_git_dir {"blast_radius":0.6666666666666666,"added":["build/Config.class","build/Tests.class"],"removed":[],"modified":["src/Config.java"],"unexpected_changes":["build/Config.class","build/Tests.class"],"expected_changes":["src/Config.java"],"total_changes":3,"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/java-null-deref"}
composite composite, weights, components, note {"composite":0.8445480701604675,"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":0.6666666666666666,"tokens_per_correct_task":0,"wall_clock_ms":272091.723,"expected_refusal":false,"refusal_produced":false,"cost_efficiency":1,"latency_efficiency":0.4080982455142271,"clean_blast":0.33333333333333337,"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 / 272.09 s
span 670f11592ec44f8cb1f27958d0a6b1d6task_setupprepare:mutations/java-null-deref0 ms → 0 ms
workdir/home/andrew/.codingagentbench-scratch/codingagentbench-openhands-mutations_java-null-deref-jwat39nx/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/openhands:1.7.0·sha256:sha256:7fcaf2226…
docker run — exact image used in this run
# pull the exact image used in this run
docker pull codingagentbench/openhands:1.7.0@sha256:sha256:7fcaf222644a5cb0afffe018f038d270130b5af3b8af366cd960f2d596a4342c

docker run --rm \
  -e CAB_ENDPOINT="$YOUR_ENDPOINT" \
  -e CAB_KEY="$YOUR_KEY" \
  codingagentbench/openhands:1.7.0@sha256:sha256:7fcaf222644a5cb0afffe018f038d270130b5af3b8af366cd960f2d596a4342c \
  run-cell \
    --tui openhands \
    --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 openhands \
  --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
670f11592ec44f8cb1f27958d0a6b1d6 task_setup prepare:mutations/java-null-deref 0 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-openhands-mutations_java-null-deref-jwat39nx/workdir","task_category":"mutations","plugin_stack":[],"behavior_mode":"factory"}
3ba52aed9c3649e6bcd6d472d1000604 ↳ 90830aa62cab4abda9b7f98f80065d32 tool_call applied_plugins 0 ms {"tui":"openhands","count":0,"applied":[],"env_keys":[],"extra_args":[],"applied_count":0,"skipped_count":0}
23b0bb8a0ead4bbcab1e4dc1f3a2a239 ↳ 90830aa62cab4abda9b7f98f80065d32 container openhands:run 272083 ms {"image":"codingagentbench/openhands:1.7.0","command":["/app/.venv/bin/python","/opt/openhands_run.py","-t","Critical null guard deleted before defaults.get() — NPE on caller-supplied null defaults","--workspace","/workspace"],"deviation":"root+docker.sock; see module docstring","exit_code":0,"timed_out":false,"docker_sock_mounted":true,"read_only":false}
90830aa62cab4abda9b7f98f80065d32 adapter_run openhands:mutations/java-null-deref 272091 ms {"timeout_s":600,"plugin_stack":[],"exit_code":0}
a9cafc0cdc484ce6a25e063f36c82f88 cleanup cleanup:openhands 0 ms {}

Model calls (0)

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

Other CLIs on this task

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[![CodingAgentBench: openhands × stepfun-ai/step-3.5-flash 84%](https://codingagentbench.com/badge/openhands/stepfun-ai/step-3.5-flash/mutations/java-null-deref.svg)](https://codingagentbench.com/cell/openhands/stepfun-ai/step-3.5-flash/mutations/java-null-deref)
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<a href="https://codingagentbench.com/cell/openhands/stepfun-ai/step-3.5-flash/mutations/java-null-deref"><img src="https://codingagentbench.com/badge/openhands/stepfun-ai/step-3.5-flash/mutations/java-null-deref.svg" alt="CodingAgentBench: openhands × stepfun-ai/step-3.5-flash 84%" /></a>
CodingAgentBench: openhands × stepfun-ai/step-3.5-flash 84%