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Model System Cards

System cards document the capabilities, safety evaluations, and responsible deployment decisions for Claude models.

ModelDateSystem card
Claude Opus 4.6February 2026Read system card
Claude Opus 4.5November 2025Read system card
Claude Haiku 4.5October 2025Read system card
Claude Sonnet 4.5September 2025Read system card
Claude Opus 4.1August 2025Read system card
Claude Sonnet 4 and Opus 4May 2025Read system card
Claude Sonnet 3.7February 2025Read system card
Claude Haiku 3.5 and Sonnet 3.5 (new)October 2024Read system card
Claude Sonnet 3.5June 2024Read system card
Claude 3March 2024Read system card
Claude 2July 2023Read system card

Model system cards \ Anthropic