FULL STORY
Claude Opus 5.5 Launches and Tops Text Arena
Anthropic launched Claude Opus 5.5 with performance matching its predecessor at 40% lower cost; it then topped LMArena's Text Arena leaderboard, with Anthropic models sweeping the top six.
2026-09-25 ~ 2026-09-27 · 2 episodes · 6 posts
Episode 1 · Anthropic Launches Claude Opus 5.5 with 40% Lower Cost (2026-09-25, 2 posts)
Anthropic released Claude Opus 5.5, the first model in the Claude 5.5 family, matching Claude Fable 5.1 on most tasks at 40% lower cost ($4/$20 per million tokens) and scoring 66.4% on Terminal-Bench.
- Claude Opus 5.5 launches at Fable 5.1-level performance with 40% lower cost — CurieuxExplorer · 2026-09-25
- Anthropic ships Opus 5.5 at $4/$20 — 40% cheaper, 66.4% on Terminal-Bench 4.0 — dl_weekly · 2026-09-26
Episode 2 · Claude Opus 5.5 tops Text Arena as Anthropic sweeps top six (2026-09-27, 4 posts)
Claude Opus 5.5 (High) debuts atop LMArena's Text Arena with a score of 1509, leading an Anthropic sweep of the top six spots, while offering strong price-performance at around $16/MToken.
- Claude Opus 5.5 debuts #1 on Text Arena as Anthropic sweeps top six — arena · 2026-09-27
- Opus 5.5 reshapes Text Arena Pareto frontier at $16/MToken — arena · 2026-09-27
- Full Text Arena board: Anthropic top six, Meta muse-spark close at 4x cheaper — arena · 2026-09-27
- Claude Opus 5.5 debuts at #1 in Text Arena with 1509 pts; Anthropic sweeps all top six spots — majidmanzarpour · 2026-09-27