Anthropic sunsets older Claude models, introduces API parameter changes

Anthropic is sunsetting several older Claude API models and endpoints, with deadlines ranging from August 2026 to November 2026. Notably, Claude Opus 4.1 has already been retired. Alongside these deprecations, Anthropic is implementing changes to request parameters, such as disallowing non-default temperature, top_p, and top_k settings on newer models like Claude Opus 4.7 and later, which will result in 400 errors if used. These changes require developers to update their API calls to avoid production failures. AI

IMPACT Developers using the Claude API must update their integrations to accommodate model retirements and parameter changes to avoid service disruptions.

RANK_REASON The item details changes to an existing API product, including deprecations and parameter adjustments, rather than a new model release or fundamental research.

Read on dev.to — LLM tag →

• Anthropic
• Claude API
• Claude Fable 5
• Claude Haiku 4.5
• Claude Mythos 5
• Claude Mythos Preview
• Claude Opus 4.1
• Claude Opus 4.5
• Claude Opus 4.7
• Claude Opus 5
• Claude Sonnet 4.5
• Claude Sonnet 5

• model release
• product

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