Lineage · Since 2023
The Claude lineage
Anthropic's Claude family of assistant models emphasizing safety and long context.
Generation 1 · Mar 14, 2023
Claude 1
First public Claude model from Anthropic.
Closed9K ctxhelpful assistantlong context
Generation 2 · Jul 11, 2023
Claude 2
100K-token context refresh of the Claude line.
Closed100K ctxlong contextcoding
Generation 3 · Mar 4, 2024
Claude 3 Opus
Top-tier model in the Claude 3 lineup with strong reasoning.
Closed200K ctxMultimodalreasoningvision
Generation 4 · Jun 20, 2024
Claude 3.5 Sonnet
Mid-tier 3.5 model that outperformed Claude 3 Opus on many tasks.
Closed200K ctxMultimodalcodingagentic tool use
Generation 5 · Sep 29, 2025
Claude Sonnet 4.5
Anthropic's coding- and agent-focused flagship in the Claude 4 family.
Closed200K ctxMultimodalagentic codingcomputer use