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CodingAgentBench

aider × stepfun-ai/step-3.5-flash

polyglot
polyglot/java-null-safety

Per-axis scores

Pass
0.000
Tokens/correct
—
Wall
104.0s
Blast
0.857
Refusal
—
Integrity
1.000
Composite
0.437

Run identity

cell_id
free-20260527/aider/stepfun-ai/step-3.5-flash/polyglot/java-null-safety
sweep_id
free-20260527
container_image
codingagentbench/aider:v0.86.0
image_digest
sha256:f2cd27890475900f9cb617b1c7a6328989a48e8168e7280ac2247a5d2d26d8a1
model_build_id
stepfun-ai/step-3.5-flash
exit_code
0

Timing

started_at
2026-06-16T18:37:37.096132Z
ended_at
2026-06-16T18:39:21.092403Z
duration
104.00 s
prompt_tokens
1,200
completion_tokens
2,700
tokens source
TUI stdout

Scorer breakdown

Axis Keys Values
pass_rate pass, exit_code, timed_out, stdout_tail, stderr_tail, partial_score {"pass":0,"exit_code":1,"timed_out":false,"stdout_tail":"ok normal\nok null user\nok null title\n","stderr_tail":"FAIL null name: expected Hi, Dr. friend got Hi, Dr. \nFAIL both null: expected Hi, friend got Hi, \n2 test(s) failed\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":0}
latency wall_clock_ms, container_active_ms, model_call_ms {"wall_clock_ms":103996.271,"container_active_ms":103981.807,"model_call_ms":0}
blast_radius blast_radius, added, removed, modified, unexpected_changes, expected_changes, total_changes, extra_git_dir {"blast_radius":0.8571428571428571,"added":[".aider.chat.history.md",".aider.input.history",".aider.tags.cache.v4/cache.db",".aider/analytics.json",".aider/caches/model_prices_and_context_window.json",".aider/installs.json"],"removed":[],"modified":["src/UserGreeter.java"],"unexpected_changes":[".aider.chat.history.md",".aider.input.history",".aider.tags.cache.v4/cache.db",".aider/analytics.json",".aider/caches/model_prices_and_context_window.json",".aider/installs.json"],"expected_changes":["src/UserGreeter.java"],"total_changes":7,"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":"polyglot/java-null-safety"}
composite composite, weights, components, note {"composite":0.4372113218561086,"weights":{"pass_rate":0.4,"integrity":0.2,"cost":0.15,"latency":0.15,"blast_radius":0.1},"components":{"pass_rate":0,"integrity":1,"blast_radius":0.8571428571428571,"tokens_per_correct_task":0,"wall_clock_ms":103996.271,"expected_refusal":false,"refusal_produced":false,"cost_efficiency":1,"latency_efficiency":0.4861707171359624,"clean_blast":0.1428571428571429,"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 / 104.00 s
span 20aa0705320c498c9d98e80c4fb2f409task_setupprepare:polyglot/java-null-safety0 ms → 13 ms
workdir/home/andrew/.codingagentbench-scratch/codingagentbench-aider-polyglot_java-null-safety-h4xi2cdd/workdir
task_categorypolyglot
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/aider:v0.86.0·sha256:sha256:f2cd27890…
docker run — exact image used in this run
# pull the exact image used in this run
docker pull codingagentbench/aider:v0.86.0@sha256:sha256:f2cd27890475900f9cb617b1c7a6328989a48e8168e7280ac2247a5d2d26d8a1

docker run --rm \
  -e CAB_ENDPOINT="$YOUR_ENDPOINT" \
  -e CAB_KEY="$YOUR_KEY" \
  codingagentbench/aider:v0.86.0@sha256:sha256:f2cd27890475900f9cb617b1c7a6328989a48e8168e7280ac2247a5d2d26d8a1 \
  run-cell \
    --tui aider \
    --model stepfun-ai/step-3.5-flash \
    --task polyglot/java-null-safety

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 aider \
  --model stepfun-ai/step-3.5-flash \
  --endpoint "$YOUR_ENDPOINT" \
  --key "$YOUR_KEY" \
  --task polyglot/java-null-safety
# provisional score — not for citation

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

Trace spans (6)

Span Kind Name Duration Attrs / Error
20aa0705320c498c9d98e80c4fb2f409 task_setup prepare:polyglot/java-null-safety 13 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-aider-polyglot_java-null-safety-h4xi2cdd/workdir","task_category":"polyglot","plugin_stack":[],"behavior_mode":"factory"}
04040542a26d48c69336747f5d40cda9 ↳ 8418524cb32542b39c12a68cc5507d44 task_setup aider:git-init-marker 0 ms {"workdir":"/home/andrew/.codingagentbench-scratch/codingagentbench-aider-polyglot_java-null-safety-h4xi2cdd/workdir","git_dir_exists":true}
1249c9c9a9d0432eb7864ab29749fd69 ↳ 8418524cb32542b39c12a68cc5507d44 tool_call applied_plugins 0 ms {"tui":"aider","count":0,"applied":[],"env_keys":[],"extra_args":[],"applied_count":0,"skipped_count":0}
217b0e52ea0745efa90810e101fc4c7c ↳ 8418524cb32542b39c12a68cc5507d44 container aider:launch 103982 ms {"image":"codingagentbench/aider:v0.86.0","argv":["--yes-always","--no-stream","--no-check-update","--no-analytics","--no-show-model-warnings","--no-suggest-shell-commands","--no-auto-commits","--no-pretty","--openai-api-base","http://172.17.0.1:31415/v1","--openai-api-key","sk-ijYE3GGIl2pTqBtwcCcuaIsZzYIIFrIWLMG3qmOK","--model","openai/stepfun-ai/step-3.5-flash","--subtree-only","--message","User class lookup crashes on null fields; rewrite to return empty string instead of NPE"],"timeout_s":600,"exit_code":0,"duration_s":103.96597466402454,"timed_out":false}
8418524cb32542b39c12a68cc5507d44 adapter_run aider:polyglot/java-null-safety 103983 ms {"timeout_s":600,"plugin_stack":[],"exit_code":0}
ab38d07cf92c45d98f11565a2f104055 cleanup cleanup:aider 0 ms {}

Model calls (0)

# Timestamp Request hash Prompt Completion Latency Finish
Per-call records not captured for this run. TUI-reported session totals: 1,200 prompt + 2,700 completion tokens.

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CodingAgentBench: aider × stepfun-ai/step-3.5-flash 44%