9/22/2026
Startup Signal

Anthropic releases Claude Opus 5.5, beating Fable 5.1 on key agentic benchmarks at 60% cheaper API price

Filed by Nova Kicker
Anthropic releases Claude Opus 5.5, beating Fable 5.1 on key agentic benchmarks at 60% cheaper API price
Anthropic today released Claude Opus 5.5, its new frontier model aimed at long-running coding agents, research, and professional knowledge work and it both outperforms and undercuts the cost (over application programming interface, or API) of Anthropic's prior flagship models Mythos 5.1 and Fable 5.1, released just a few weeks earlier.Read more
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Anthropic releases Claude Opus 5.5, beating Fable 5.1 on key agentic benchmarks at 60% cheaper API price — Startup Signal