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 · Feb 24, 2025

Claude 3.7 Sonnet

Anthropic's first hybrid reasoning model, offering both standard responses and an extended thinking mode. Launched alongside Claude Code.

Closed200K ctxMultimodal

Generation 6 · May 22, 2025

Claude Opus 4 is Anthropic's top-tier model from the Claude 4 generation, released in May 2025 alongside Sonnet 4. It is built for long, autonomous coding and agent work, and can think at length while using tools.

Closed200K ctxMultimodalLong-running agentic codingExtended thinking with tool use

Generation 7 · Sep 29, 2025

Claude Sonnet 4.5

Anthropic's coding- and agent-focused flagship in the Claude 4 family.

Closed200K ctxMultimodalagentic codingcomputer use