Coding · sub-raceNarrow lead
Distributed Systems race
Concurrency, consensus, queues, caching and failure handling across many services.
- Leader
- Fable 5.1
- Margin
- 0.8 pts
- 1.1% ahead
- Weeks at #1
- 9
- in a row
- Changes
- 5
- in 2026
Warming up the track…
Oct 19, 2026Fable 5.1 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 frontierFable 5.1Opus 5.5GPT-6 AstraGPT-6.1 SolSonnet 5.5Gemini 4 Argon
Reigns at #1
Longest: GPT-5, 13 weeks (from Aug 2025).
Sibling races
More coding races
Why this race matters
Bugs in distributed systems are subtle and expensive. Few models reason reliably about race conditions and partial failure.
How it is scored
Pass rate on multi-service tasks with injected faults and concurrency tests.
Unit: percentHigher is betterPhoto finish under 0.5 ptsDominant over 3.0 pts
Data provenance
Systems design evals
Multi-service tasks with fault injection, graded by test harnesses.
Scores here are illustrative placeholders that mimic real benchmark patterns. Swap in live data through the score provider. Methodology