Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on Migrate a 3-file Node.js module from callbacks to async/await + fix a validation bug
AClaude Sonnet 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-16 · by @bobsiopener
- Estimated cost
- $0.07
- Wall time
- 22s
- Human step-ins
- 0
- Outcome
- Pass
Compare with other models on this task →
Summary
Exact prompt
# Task: migrate a small Node.js codebase from callbacks to async/await `lib/store.js`, `lib/inventory.js`, `lib/orders.js` use Node-style callbacks. Convert ALL three to promise-returning `async` functions (same function names and arguments minus the callback; results become resolved values, errors become rejections with the same messages). Keep behaviour identical, including order rollback on failure. While you're there, fix this reported bug: `removeStock` accepts zero/negative/NaN quantities; it must reject with the same message as `addStock` ("qty must be positive") and not change stock. Update `test/` to the new API and add tests. Run `npm test` (node --test). No new dependencies, no network.
Hidden node:test suite checks every API became promise-based, error messages preserved, rollback semantics kept, and the qty bug fixed. Partial migrations or rollback regressions fail. Original benchmark task written for usecaserank.com (not based on a specific public post). Headless, offline run on a reproducible fixture. Each run's notes say how its cost was measured (estimates are marked).
Success criteria: 1. Hidden node:test file is copied into test/ and `node --test test/` must exit 0 (60 s timeout); the agent's own tests in test/ must also pass. 2. Hidden tests check: store/inventory/orders functions return promises with the same results; errors become rejections with the original messages; addStock rejects 0/NaN; removeStock rejects zero/negative quantities with 'qty must be positive' and leaves stock unchanged; insufficient stock rejects without changes; listStock correct; fulfil succeeds and on failure rolls back already-removed lines. 3. No callback usage left in lib/*.js (no `cb(` / `callback(`) and each file uses async or Promise.
Setup notes: Use Case Scout batch 4 case d01-js-callbacks-to-async (offline fixture). Prepared with batch4/prepare.sh; hidden key/tests kept outside the agent's work dir. Prompt = TASK.md verbatim. Scored with the scout's scorer: `bash score.sh WORKDIR`. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. Claude Code's own reported cost for claude-sonnet-5.5: $0.07193. Score: pass. Cost is an ESTIMATE: measured tokens x pricing.json list price (Claude Pro subscription, nothing billed); input_tokens include cache reads and writes. Single run.
Estimated cost List-price estimate; not actually billed.
Metrics
- Estimated cost
- $0.07
- Wall time
- 22s
- Human step-ins
- 0
- Turns
- 3
| Model | Input tok | Output tok | Cost |
|---|---|---|---|
| AClaude Sonnet 5.5anthropic/claude-sonnet-5.5effort default (no --effort flag) · thinking on | 59,583 | 2,907 | $0.07 |
Reproduce this run
- Use the use case prompt on the use case page.
- Same setup: Claude Sonnet 5.5 (anthropic/claude-sonnet-5.5, effort default (no --effort flag) · thinking on) via
Claude Code 2.1.299 (headless -p), cloud. - It counts as a success only if it meets every success criterion: 1. Hidden node:test file is copied into test/ and `node --test test/` must exit 0 (60 s timeout); the agent's own tests in test/ must also pass. 2. Hidden tests check: store/inventory/orders functions return promises with the same results; errors become rejections with the original messages; addStock rejects 0/NaN; removeStock rejects zero/negative quantities with 'qty must be positive' and leaves stock unchanged; insufficient stock rejects without changes; listStock correct; fulfil succeeds and on failure rolls back already-removed lines. 3. No callback usage left in lib/*.js (no `cb(` / `callback(`) and each file uses async or Promise.
- Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.
How runs are scored: Methodology.
Was this useful?
Automated checks
Trust 80% comes from these checks (how Trust % works).
- Run date is not in the future : passed
- Model is in the dated pricing table : passed
- Cost recomputed from tokens matches : passed
- Cached tokens are consistent : passed
- Output throughput is plausible : passed
- Autonomy matches step-ins : passed
- Step-ins do not exceed turns : passed
- Retries agree with first-try result : passed
- Evidence log SHA-256 matches : passed
- Evidence log is substantial : passed
Evidence log
[
{
"duration_api_ms": 20799,
"stop_reason": "end_turn",
"session_id": "[REDACTED]",
"total_cost_usd": 0.0719298,
"usage": {
"input_tokens": 6,
"cache_creation_input_tokens": 9459,
"cache_read_input_tokens": 50118,
"output_tokens": 2907,
"output_tokens_details": {
"thinking_tokens": 225
},
"server_tool_use": {
"web_search_requests": 0,
"web_fetch_requests": 0
},
"service_tier": "standard",
"cache_creation": {
"ephemeral_1h_input_tokens": 9459,
"ephemeral_5m_input_tokens": 0
},
"inference_geo": "global",
"iterations": [
{
"input_tokens": 2,
"output_tokens": 451,
"cache_read_input_tokens": 19498,
"cache_creation_input_tokens": 2500,
"cache_creation": {
"ephemeral_5m_input_tokens": 0,
"ephemeral_1h_input_tokens": 2500
},
"type": "message"
}
],
"speed": "standard",
"fallback_credit": null
},
"modelUsage": {
"claude-sonnet-5-5": {
"inputTokens": 6,
"outputTokens": 2907,
"cacheReadInputTokens": 50118,
"cacheCreationInputTokens": 9459,
"webSearchRequests": 0,
"costUSD": 0.0719298,
"contextWindow": 1000000,
"maxOutputTokens": 128000,
"thinkingTokens": 225,
"canonicalModel": "claude-sonnet-5-5",
"provider": "firstParty",
"costBasis": "list"
}
},
"permission_denials": [],
"terminal_reason": "completed",
"fast_mode_state": "off",
"fast_mode_disabled_reason": "sdk_opt_in_required",
"subagent_stats": {
"spawned": 0,
"requested": {
"background": 0,
"foreground": 0,
"unset": 0
},
"started_in_background": 0,
"max_depth": 0,
"spawned_by_subagents": 0,
"completed": 0,
"failed": 0,
"killed": {
"parent": 0,
"user": 0,
"system": 0
},
"refused": {
"depth_limit": 0,
"concurrency_limit": 0,
"budget": 0
},
"by_type": {}
},
"safety_stops": 0,
"is_error": false,
"num_turns": 3,
"subtype": "success",
"api_error_status": null,
"result": "I converted `lib/store.js`, `lib/inventory.js` and `lib/orders.js` to `async` functions, and `npm test` passes all 8 tests.\n\n- **API:** the function names and arguments are the same, minus the callback. Results are now resolved values, and errors are rejections with the same messages.\n- **`removeStock` bug:** it now rejects with \"qty must be positive\" for zero, negative or NaN quantities, before it reads or writes any stock.\n- **Rollback in `fulfil`:** lines are removed one after another. On a failure, the lines already removed are added back in the same order as before. The result is still `{ status: 'rejected', reason }`. As in the original, errors during rollback are ignored.\n- **Order with a zero-quantity line:** because of the `removeStock` fix, an order containing a line with qty 0 or less is now rejected with \"qty must be positive\" and rolled back. Previously such a line was accepted. This follows from the fix you asked for.\n- **`listStock` fetch order:** it now fetches all values at once instead of one by one. The result is the same.\n\nI replaced the old callback test in `test/basic.test.js` with promise-based tests. They cover the store, `addStock` and `removeStock` validation, `listStock`, a successful order, rollback on insufficient stock, and rollback on an invalid-quantity line. I added no dependencies.",
"ttft_ms": 2696,
"type": "result",
"duration_ms": 21882,
"uuid": "[REDACTED]",
"ttft_stream_ms": 1862,
"time_to_request_ms": 252,
"first_content_frame_ms": 1862,
"queued_turn_count": 0,
"result_index": 0
}
]