Anthropic released Claude Opus 5.5 on September 22, 2026, the first model in its Claude 5.5 family. The company says it matches Claude Fable 5.1 on most work, costs 40% less than Opus 5 on typical workloads, and is priced at $4 per million input tokens and $20 per million output tokens. It is generally available on the Claude API, Amazon Bedrock, Google Cloud and Microsoft Foundry, with Fable-class biology and cybersecurity safeguards; Sonnet 5.5 and Haiku 5.5 are due in the coming weeks.
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