New #1October 8, 2026Impact
Claude Opus 5.5 takes #1 on LMArena Code Agent
On the LMArena Code Agent leaderboard published Oct 8, 2026, Claude Opus 5.5 moved from #2 to #1 with +14.3 points, ahead of GPT-6 Astra (+13.1 points).
Why it matters
LMArena Code Agent is the source for the Agentic Coding race on AIModelRace, so the race leader follows it.
The details
- Claude Opus 5.5: +14.3 points.
- GPT-6 Astra: +13.1 points.
- Ranks here are by rating among all models on the board; LMArena's own rank also accounts for confidence intervals.
Models in this story
Provenance: LMArena leaderboard published Oct 8, 2026; ratings from blind pairwise votes. Generated automatically from the published data. Sources: LMArena Code Agent leaderboard · LMArena leaderboard dataset (CC BY 4.0) See the race.