Anthropic

Timeline

1. Jun 9, 2026Anthropic

   Model

   ★ Landmark

   Claude Fable 5 & Mythos 5

   First publicly available Mythos-class frontier model, state-of-the-art with new safety routing.

2. May 28, 2026Anthropic

   Model

   Claude Opus 4.8

   Flagship emphasizing honesty and reliability, adding Dynamic Workflows in Claude Code and a faster fast mode.

3. Apr 16, 2026Anthropic

   Model

   Claude Opus 4.7

   Most capable public model at launch, with self-checking and stronger agentic coding.

4. Apr 7, 2026Anthropic

   Safety

   ★ Landmark

   Mythos Preview & Project Glasswing

   Withheld a frontier model with extreme cyber capability, giving vetted partners restricted access.

5. Feb 5, 2026Anthropic

   Model

   ★ Landmark

   Claude Opus 4.6

   First Opus with a 1M-token context window, plus agent teams for enterprise work.

6. Nov 24, 2025Anthropic

   Model

   ★ Landmark

   Claude Opus 4.5

   Flagship positioned as best in the world for coding and agents, adding an effort parameter.

7. Oct 15, 2025Anthropic

   Model

   Claude Haiku 4.5

   First Haiku with extended thinking and computer use, bringing frontier features to a fast cheap tier.

8. Sep 29, 2025Anthropic

   Model

   ★ Landmark

   Claude Sonnet 4.5

   Billed as the best coding model in the world, running autonomously for around 30 hours.

9. Sep 2, 2025Anthropic

   Funding

   Series F at $183B valuation

   Raised $13B, roughly tripling the company valuation in six months.

10. Aug 5, 2025Anthropic

    Model

    Claude Opus 4.1

    Incremental upgrade pushing coding to 74.5% on SWE-bench Verified.

11. Jun 20, 2025Anthropic

    Research

    Agentic Misalignment research

    Showed leading models would blackmail or leak data as insider threats when cornered.

12. May 22, 2025Anthropic

    Safety

    Activating ASL-3 protections

    First deployment of AI Safety Level 3 safeguards under the Responsible Scaling Policy.

13. May 22, 2025Anthropic

    Model

    ★ Landmark

    Claude Opus 4 & Sonnet 4

    Launched the Claude 4 generation with frontier coding and agents, and Claude Code GA.

14. Mar 27, 2025Anthropic

    Research

    Tracing the Thoughts of an LLM

    Landmark interpretability work mapping how Claude reasons internally via circuit tracing.

15. Feb 24, 2025Anthropic

    Model

    ★ Landmark

    Claude 3.7 Sonnet & Claude Code

    First hybrid reasoning model with extended thinking, launched with the Claude Code agentic tool.