Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on Resolve merge conflicts in a set of config files using written precedence rules

AClaude Sonnet 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-20 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.05
Wall time: 12s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Resolve merge conflicts in config files Inputs: `conflicted/` holds INI-style config files left with git-style conflict blocks (`<<<<<<< ours` / `=======` / `>>>>>>> theirs`, one `key = value` line per side). `base/` holds the same files as they were at the common ancestor. Resolve every conflict block with the first rule that applies: 1. Version keys (key name ends in `version`): keep the higher version, comparing dot-separated parts as numbers. 2. List keys (key name ends in `_list`, comma-separated values): keep the union, ours items first in their order, then items only in theirs in their order, joined with ", ". 3. If exactly one side changed the key relative to base/, keep that side. 4. Otherwise keep ours. - Write each resolved file to out/ under the same relative path (e.g. `conflicted/app/db.ini` -> `out/app/db.ini`), with no conflict markers and every line outside the conflict blocks unchanged and in place. - Also write `out/report.json`: `{"conflicts": <total blocks>, "by_rule": {"version": n, "list": n, "one_side": n, "ours": n}}`. ## How this run works - Work on your own: nobody will answer questions in this task, and writing to `ask/` counts against the run. - Write only under `out/`. Create `out/` if it is missing. Inputs are synthetic; don't fetch anything from the network. - Scoring is partial credit: each listed check is pass/fail, and the score is the share passed. Numbers are compared to within 0.005 unless the task says otherwise.

Resolve 10-40 git-style conflict blocks across 3-5 INI config files using four ordered rules: numeric version max, list union, one-sided change against the base copy, and otherwise ours. Every seed includes a version pair that string comparison gets wrong (such as 2.9 vs 2.10), and lines outside the conflicts must survive untouched. 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: files_clean_and_unconflicted_lines_kept version_keys_numeric_max list_keys_union one_sided_changes_kept both_changed_keep_ours report_counts

Setup notes: Batch 16 case r03-merge-conflicts (offline, synthetic inputs, seed 1241027703). Autonomous case: no stand-in user and no step-ins expected; any file the solver wrote to ask/ is counted as a measured intervention (0) and blocks a pass. Prompt = TASK.md verbatim. Hidden key kept outside the solver's work dir. Scored with the case's scorer (python3 score.py WORKDIR KEYDIR, absolute paths); pass = every check true and no ask/ files. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. 1-min load average at scoring 0.11 (8 cores). Claude Code's own reported cost for claude-sonnet-5.5: $0.050733. Score: 6/6. 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: $0.05
Wall time: 12s
Human step-ins: 0
Turns: 3

Model usage
Model	Input tok	Output tok	Cost
AClaude Sonnet 5.5anthropic/claude-sonnet-5.5effort default (no --effort flag) · thinking on	57,689	1,472	$0.05

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: files_clean_and_unconflicted_lines_kept version_keys_numeric_max list_keys_union one_sided_changes_kept both_changed_keep_ours report_counts
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

[
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  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
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   "output_tokens_details": {
    "thinking_tokens": 110
   },
   "server_tool_use": {
    "web_search_requests": 0,
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   },
   "service_tier": "standard",
   "cache_creation": {
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     "output_tokens": 233,
     "cache_read_input_tokens": 19009,
     "cache_creation_input_tokens": 1282,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 1282
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-sonnet-5-5": {
    "inputTokens": 6,
    "outputTokens": 1472,
    "cacheReadInputTokens": 49931,
    "cacheCreationInputTokens": 7752,
    "webSearchRequests": 0,
    "costUSD": 0.0507331,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 110,
    "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": {
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   "refused": {
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   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 3,
  "subtype": "success",
  "api_error_status": null,
  "result": "I resolved all 30 conflict blocks across the three config files and wrote the results to `out/`: `jobs/worker.ini`, `web/server.ini` and `deploy/release.ini`. A grep of `out/` found no conflict markers left. I didn't diff the non-conflict lines against the originals, but the script copies them through unchanged.\n\n`out/report.json` has this breakdown:\n\n| Rule | Blocks |\n|---|---|\n| version | 4 |\n| list | 7 |\n| one_side | 17 |\n| ours | 2 |\n\nI looked up each key's base value by section plus key name, since the same key name can appear in more than one section. The script is at `../scripts/r.py` (outside `out/`).",
  "ttft_ms": 2044,
  "type": "result",
  "duration_ms": 11630,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1246,
  "time_to_request_ms": 248,
  "first_content_frame_ms": 1247,
  "queued_turn_count": 0,
  "result_index": 0
 }
]