2024-09-04: Claude 1 and Instant models 

Takes effect

21 Oct 2026

Published

21 Oct 2026

 These models were retired November 6, 2024. On September 4, 2024, Anthropic notified developers using Claude 1 and Instant models of their upcoming retirements. Retirement date Deprecated model Recommended replacement November 6, 2024 claude-1.0 claude-haiku-4-5-20251001 November 6, 2024 claude-1.1 claude-haiku-4-5-20251001 November 6, 2024 claude-1.2 claude-haiku-4-5-20251001 November 6, 2024 claude-1.3 claude-haiku-4-5-20251001 November 6, 2024 claude-instant-1.0 claude-haiku-4-5-20251001 November 6, 2024 claude-instant-1.1 claude-haiku-4-5-20251001 November 6, 2024 claude-instant-1.2 claude-haiku-4-5-20251001 API parameter deprecations  Anthropic occasionally deprecates request parameters that no longer apply to current models. A new model can reject a deprecated parameter, and a new API version can remove it for every model. Parameter Status Behavior Recommended replacement temperature , top_p , top_k Removed in API version 2026-10-21 Returns a 400 error . Earlier API versi

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