Everything you need to know about Claude Mythos—Anthropic's leaked next-generation AI model codenamed "Capybara".
Learn how to access Claude Mythos, Claude Mythos capabilities, Claude Mythos vs other AI models, and get notified when Claude Mythos launches.
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Claude Mythos is Anthropic's unreleased next-generation AI model, internally codenamed "Capybara". Claude Mythos sits at Tier 4 in the Claude model hierarchy—above Opus, Sonnet, and Haiku. According to leaked documents, Claude Mythos represents a "step change" in AI capabilities, with significant improvements in coding, complex reasoning, and autonomous agent execution. Some sources also refer to Claude Mythos as "Opus 5" or "Claude Opus 5", though Claude Mythos appears to be a distinct model tier rather than a version upgrade.
Many people are asking: "How to access Claude Mythos?" and "How to use Claude Mythos?" Here's the current Claude Mythos access status.
Based on Anthropic's typical release patterns, Claude Mythos access will likely roll out in phases:
First access to Claude Mythos for select enterprise partners
Claude Mythos access for Enterprise plan organizations
General Claude Mythos API access with rate limits
Consumer Claude Mythos access (possibly limited)
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Developers are asking about Claude Mythos Cursor integration. Here's what we know about using Claude Mythos in Cursor and other IDEs.
Claude Mythos is not available in Cursor IDE yet. Cursor typically adds support for new Claude models shortly after Anthropic releases the API. When the Claude Mythos API becomes publicly available, Cursor integration for Claude Mythos is expected to follow within days or weeks.
Best for complex code tasks
Best balance of speed/quality
Best for quick completions
Get notified when Claude Mythos becomes available in Cursor IDE
Based on leaked internal documentation, Claude Mythos demonstrates breakthrough performance in these key areas. Here's what Claude Mythos can do.
Claude Mythos shows significant improvements in code generation, debugging, and repository-level reasoning compared to Claude Opus.
Claude Mythos excels at multi-step logical analysis and long-chain reasoning tasks that challenge current AI models.
Claude Mythos demonstrates advanced vulnerability detection and zero-day discovery capabilities for security research.
Claude Mythos can plan and execute cross-system tasks without human intervention, enabling true AI agents.
Claude Mythos features recursive self-correction, continuously improving outputs without external prompting.
Claude Mythos brings deep connective tissue between ideas and knowledge domains for creative work.
The Claude Mythos leak occurred through multiple security incidents at Anthropic. Here's the Claude Mythos leak timeline.
How does Claude Mythos compare to current AI models? See the Claude Mythos benchmark comparison below.
| MODEL | CODING | REASONING | PRICING | ACTION |
|---|---|---|---|---|
Claude Mythos Tier 4 (Unreleased) | 98 | 97 | TBD | Coming Soon |
Claude Opus 4.6 Tier 3 (Flagship) | 92 | 93 | $15 / $75 | Try Free → |
Claude Mythos scores are based on leaked benchmark data. Actual Claude Mythos performance may vary upon release.
Common questions about Claude Mythos answered. Everything you want to know about Claude Mythos.
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