Anthropic

Claude Opus 5.5

Generally Available

First model in the Claude 5.5 family, released September 22, 2026 for long-running agentic coding and knowledge work. Anthropic says it performs at Claude Fable 5.1 level on most work, costs 40% less than Opus 5 on typical workloads, generates output more than 30% faster, and is priced at $4 per million input tokens and $20 per million output tokens, with cache reads at $0.20. Deployed with Fable-class biology and cybersecurity safeguards; model ID claude-opus-5-5.

Latest update Sep 24, 2026

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Current status

Generally available September 22, 2026 on the Claude API, Amazon Bedrock, Google Cloud and Microsoft Foundry. External pre-release evaluators included Frontier Design and METR. Sonnet 5.5 and Haiku 5.5 are scheduled to follow in the coming weeks.

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In the news2

  1. Anthropic expands Cyber Verification into three access tiers

    On Oct. 6, 2026 Anthropic said it merged Project Glasswing and its original Cyber Verification Program into a three-tier CVP that gives vetted defenders reduced cyber blocks on Claude Opus 5.5, Sonnet 5.5, Mythos 5.1 and later models. Defense Access covers incident response and malware analysis; Red Team Access adds authorized penetration testing for organizations; Specialized Access, reviewed with the US government, is for testing safety-critical systems such as power grids and flight software. Anthropic said Glasswing partners found at least 129,000 verified vulnerabilities from April to July 2026, plus 5,500 from Anthropic open-source scans, with more than 33,000 rated critical or high.

    www.anthropic.com www.anthropic.com www.anthropic.com srnnews.com

  2. Anthropic ships Claude Opus 5.5 at Fable-level prices

    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.

    www.anthropic.com techcrunch.com

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