Anthropic launches Claude Opus 5.5: Fable 5.1-level performance at 40% lower cost
KyeGomezB · x · 2026-09-23
Anthropic officially introduced Claude Opus 5.5, the first model in its Claude 5.5 family.
- Performance: matches Claude Fable 5.1 on most tasks while costing 40% less to run than Opus 5.
- Pricing: input/output drops to $4/$20 per 1M tokens; cache reads fall 60% to $0.20, all vs Opus 5.
- Speed: output is over 30% faster, with a Fast mode reaching up to 2.5x speed at double token prices.
Related event: Anthropic Launches Claude Opus 5.5: Smarter, Faster and 40% Cheaper(55 posts)→
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