Coding-agent evidence

Model benchmarks, separated by task and methodology.

Compare patches, objective correctness, manual review, solution time, and known provider cost without treating availability or infrastructure failures as code quality.

Methodology

How a benchmark result is produced

Every route follows the same controlled path. A failure stays visible as evidence; it is not converted into a quality score or silently removed from the table.

  1. 01Freeze releaseTask, roster, checks, and allowed files are fixed.
  2. 02PreflightA harmless hi request confirms the exact route.
  3. 03One clean attemptFresh workspace, agent home, and session for every model.
  4. 04Verify patchAllowed paths, public tests, and objective checks run separately.
  5. 05Review evidencePatch, timing, cost, and outcome are frozen; reviews remain separate.
  6. 06Publish manuallySanitized evidence and checked tables are reviewed before release.

One attempt. No second chance. Retries cost time and money; the first delivered result is the one preserved and scored. Read the full workflow ↗

Current · isolated

Retry-policy patch

A focused JavaScript maintenance task executed through the clean-room OpenCode and Codex pipeline, with public tests, a private objective evaluator, immutable patches, time, and provider-reported cost.

  • 42 runtime routes
  • 4 review criteria
  • public + objective checks
View current results
Patch benchmark

Ledger reconciliation

The first broad patch comparison: 59 coding-agent candidates solving the same ledger task, with availability kept separate from quality scoring.

  • 59 candidates
  • 37 scored patches
  • 5 quality dimensions
View ledger results
Current · results published

Bug fixing

Diagnose and repair duplicate IDs, exact money parsing, sales, refunds, invalid rows, and daily ledger totals.

  • 76 tested routes
  • public + objective checks
  • 4 review criteria
  • clean-room execution
View results
Current · results published

Feature implementation

Implement feature overrides and deterministic percentage rollout from a detailed behavioral contract.

  • 62 tested routes
  • 84 recorded outcomes
  • 4 review criteria
  • clean-room execution
View results
Current · results published

Refactoring

Extract one shared event-filtering helper while preserving the public API and all existing behavior.

  • 41 tested routes
  • 83 recorded outcomes
  • 4 review criteria
  • clean-room execution
View results
Current · results published

Repository navigation

Explore an unfamiliar module layout, locate the correct formatter, and repair account status labels.

  • 80 tested routes
  • 81 recorded outcomes
  • 4 review criteria
  • correct-layer change
View results
Current · results published

Tests / edge cases

Repair strict integer-range parsing and author meaningful tests that survive mutation testing.

  • 15 tested routes
  • 4 review criteria
  • 2 allowed files
View results
Archive · provisional

Historical five-task results

Archived results from the older combined run. Audit found shared-history contamination, so these records are retained as evidence but are not part of the new clean-room nomination pages.

  • 31 candidates
  • 5 old task records each
  • not a blind benchmark
View provisional archive
Methodology

Runner and source evidence

The public benchmark runner documents clean-room isolation, separate candidate testing and judging, objective evaluation, timing, cost policy, and immutable result artifacts.

  • OpenCode + Codex
  • MIT licensed
  • public artifacts
Open benchmark repository ↗