Claude Opus 5.5 becomes a major commercial flagship comparison point

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Claude Opus 5.5 coverage provides unusually concrete deployment information, including pricing, context and output limits, effort behavior, lifecycle details, and benchmark-cost distinctions. Comparisons with GPT-6 Astra are useful for workload routing, but most performance claims still require independent testing.

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Updated Sep 28, 2026

AI Model Release Tracker

Anthropic launches Claude Sonnet 5.5 with 30% cost reduction per-task due to faster speeds and fewer tool calls

Anthropic releases Claude Sonnet 5.5 with the cyber limits it reserved for its best models

Anthropic debuts Claude Sonnet 5.5 running 30% faster than the previous-generation AI model

Anthropic upgrades Claude with new Sonnet 5.5 model, details here

Anthropic rolls out second Claude 5.5 model as it builds toward IPO

Anthropic launches cheaper AI model focused on routine tasks

Anthropic launches cheaper AI model, its second release since CEO's call for a slowdown

Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner

Claude Opus 5.5: Anthropic's Flagship Model, Fully Specified