Claude Opus 4
Major release: A new general-purpose AI model from a leading lab, the kind behind ChatGPT, Claude or Gemini: a new flagship or generation.
Key facts
- Released
- May 22, 2025
- What it does
- Text and chat: Writes, answers questions and holds a conversation.Code: Writes, explains and fixes code.Thinks first: Can reason step by step before it answers: slower, but better at maths, code and tricky questions.Sees images: Understands pictures, screenshots and charts you share with it.
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- How
- For developers, through an API
- Announced as
- “Hybrid reasoning model that pushes the frontier for coding and AI agents, featuring a 200K context window”
From trckr's archive of releases before it started watching. Date and details from Epoch AI's database of AI models (CC BY 4.0).
How it scores
From independent testers, never the lab's own claims.
- Combined test score#103 of 235
- GPT-6 Astra169
- 2GPT-6.1 Sol169
- 102Qwen3-235B-A22B-Thinking143
- 103Claude Opus 4143
- 104Claude Haiku 4.5143
Source: Epoch AI · Epoch Capabilities Index
Compare Claude Opus 4 with
It came out 87 days after Claude 3.7 Sonnet, the lab's previous model.
The details
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