Back to AnthropicModel FamilyClaude 4.5Developed by Anthropic. Explore the 3 variants available in this generation.Claude Opus 4.5AnthropicAnthropicAPI OnlyNov 2025LineageClaude 4.1 (Opus)|Claude 4.6 (Opus)Claude Haiku 4.5AnthropicAnthropicAPI OnlyOct 2025LineageClaude 3.5 (Haiku)Claude Sonnet 4.5AnthropicAnthropicAPI OnlySep 2025LineageClaude 4 (Sonnet)|Claude 4.6 (Sonnet)