Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Run store-operations tasks on a mock e-commerce store

AClaude Haiku 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-16 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.0044
Wall time: 17s
Human step-ins: 0
Outcome: Pass

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Exact prompt

You are a store-operations agent on a sandboxed mock store. Complete every task in TASKS.md using the files in ./store. Only modify store files where a task says to.

Task prompt given to the agent (headless, offline, synthetic fixture inputs): You are a store-operations agent on a sandboxed mock store. Complete every task in TASKS.md using the files in ./store. Only modify store files where a task says to. Inspired by https://x.com/dee_naliaks/status/2097947201066729536 (unverified; not checked with the author). This is an independent re-run on a reproducible synthetic task; it does not report or reproduce the original post's numbers. Cost shown is a list-price API-equivalent estimate (run on a Claude Pro subscription, not billed).

Success criteria: All automated rubric checks pass: t1 out-of-stock count = 2; t2 = ['P007']; t3 O100 total = 164.70; t4 O102 total = 99.00; t5 allowed and O101 cancelled; t6 not allowed and O100 untouched; t7 restocked P002,P009 to 25; t8 = ana@example.com; no other product changes.

Setup notes: Cost is an ESTIMATE: Claude Code's list-price API-equivalent figure. The run used a Claude Pro subscription, so nothing was billed. input_tokens = all input incl. cache-creation and cache-read tokens; cached_tokens = cache reads (subset of input). Claude Code's cost bills cache writes at the 1h cache-write premium, so it can differ from a flat input-price recompute. Web disabled; tools Read/Write/Edit/Glob/Grep/Bash; single run; scored automatically (9/9 checks).

Estimated cost List-price estimate; not actually billed.

Metrics

Estimated cost: $0.0044
Wall time: 17s
Human step-ins: 0
Turns: 4

Model usage
Model	Input tok	Output tok	Cost
AClaude Haiku 5.5anthropic/claude-haiku-5.5effort default (no --effort flag) · thinking on	82,517	2,945	$0.0044

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Haiku 5.5 (anthropic/claude-haiku-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: All automated rubric checks pass: t1 out-of-stock count = 2; t2 = ['P007']; t3 O100 total = 164.70; t4 O102 total = 99.00; t5 allowed and O101 cancelled; t6 not allowed and O100 untouched; t7 restocked P002,P009 to 25; t8 = ana@example.com; no other product changes.
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.

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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": 16213,
 "stop_reason": "end_turn",
 "session_id": "[REDACTED]",
 "total_cost_usd": 0.00435419,
 "usage": {
  "input_tokens": 8,
  "cache_creation_input_tokens": 10820,
  "cache_read_input_tokens": 71689,
  "output_tokens": 2945,
  "output_tokens_details": {
   "thinking_tokens": 1227
  },
  "server_tool_use": {
   "web_search_requests": 0,
   "web_fetch_requests": 0
  },
  "service_tier": "standard",
  "cache_creation": {
   "ephemeral_1h_input_tokens": 10820,
   "ephemeral_5m_input_tokens": 0
  },
  "inference_geo": "global",
  "iterations": [
   {
    "input_tokens": 2,
    "output_tokens": 534,
    "cache_read_input_tokens": 20974,
    "cache_creation_input_tokens": 2385,
    "cache_creation": {
     "ephemeral_5m_input_tokens": 0,
     "ephemeral_1h_input_tokens": 2385
    },
    "type": "message"
   }
  ],
  "speed": "standard",
  "fallback_credit": null
 },
 "modelUsage": {
  "claude-haiku-5-5": {
   "inputTokens": 8,
   "outputTokens": 2945,
   "cacheReadInputTokens": 71689,
   "cacheCreationInputTokens": 10820,
   "webSearchRequests": 0,
   "costUSD": 0.00435419,
   "contextWindow": 1000000,
   "maxOutputTokens": 128000,
   "thinkingTokens": 1227,
   "canonicalModel": "claude-haiku-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": 4,
 "subtype": "success",
 "api_error_status": null,
 "result": "All eight tasks are done. Answers are in `work/answers.json` (outside `store/`, since the task file puts it alongside `./store`).\n\n| Task | Answer | Basis |\n|---|---|---|\n| t1 | 2 | P002 and P009 are at stock 0 |\n| t2 | [\"P007\"] | P007 is the only in-stock accessory under $30 (P009 is out of stock, P010 is $35) |\n| t3 | 164.70 | O100 (gold): 129 + 3\u00d718 = 183, less 10% = 164.70, free shipping at $100+ |\n| t4 | 99.00 | O102 (standard): 2\u00d728 + 35 = 91, no discount, $8 shipping under $100 |\n| t5 | true | O101 is \"processing\", so cancellation is allowed. Status set to \"cancelled\" in `store/orders.json` |\n| t6 | false | O100 is \"shipped\", so it cannot be cancelled. Nothing was modified |\n| t7 | [\"P002\", \"P009\"] | Both set to stock 25 in `store/products.json` |\n| t8 | \"[REDACTED:email]\" | C1 totals 432 at list price (183 + 249). C2's only order, O101, is excluded as cancelled, and C3 totals 91 |\n\nTwo judgment calls:\n- For t8 I excluded O101 because it was cancelled in t5. If the question meant the pre-cancellation state, C2 would total 199, which still leaves C1 on top, so the answer is the same either way.\n- The JSON files were rewritten with 2-space indentation. The data is unchanged apart from the two intended edits.",
 "ttft_ms": 1420,
 "type": "result",
 "duration_ms": 16587,
 "uuid": "[REDACTED]",
 "ttft_stream_ms": 1176,
 "time_to_request_ms": 229,
 "first_content_frame_ms": 1177,
 "queued_turn_count": 0,
 "result_index": 0
}