Coding · sub-raceNarrow lead
Debugging & Repair race
Finding the root cause of a failing test or production bug in an unfamiliar codebase and fixing it without breaking anything else.
- Leader
- Opus 5.5
- Margin
- 1.0 pts
- 1.1% ahead
- Weeks at #1
- 4
- in a row
- Changes
- 5
- in 2026
Warming up the track…
Oct 19, 2026Opus 5.5 leads
2025Apr ’25Jul ’25Oct ’252026Apr ’26Jul ’26Oct ’26
Score history
Top 6 today over the leader's frontier · click to jump to a week
#1 frontierOpus 5.5Fable 5.1GPT-6 AstraGPT-6.1 SolSonnet 5.5Grok 4.7
Reigns at #1
Longest: Opus 4.6, 14 weeks (from Feb 2026).
Sibling races
More coding races
Why this race matters
Developers spend more time fixing code than writing it. Root-cause skill is the real productivity multiplier.
How it is scored
Resolved-issue rate on validated real-world bug reports.
Unit: percentHigher is betterPhoto finish under 0.5 ptsDominant over 3.0 pts
Data provenance
Human-validated GitHub issues from real Python repos.
Scores here are illustrative placeholders that mimic real benchmark patterns. Swap in live data through the score provider. Methodology