Mythos

Claude Mythos is 📝Anthropic's reported next-generation AI model — a tier above 📝Claude Opus 4.6 with major gains in multi-step reasoning, software engineering, and agentic capabilities.

Quick Answer

Claude Mythos is an 📝Artificial Intelligence (AI) 📝Large Language Model (LLM) developed by Anthropic. It is not the same as 📝MythOS — an independent AI-native knowledge platform at mythos.one that has been in continuous use since 2018.

  • Developer: Anthropic
  • Model family: Claude
  • Tier: Above Claude Opus 4.6
  • Context window: 1M tokens with 128K max output
  • Reported strengths: Multi-step reasoning, code generation, agentic workflows, cybersecurity
  • Release status: Preview launched April 7, 2026 via Project Glasswing. General availability unconfirmed.

How to Access Claude Mythos

As of April 2026, Claude Mythos is available through Project Glasswing — Anthropic's early-access program. There is no public API endpoint or general availability date confirmed. 📝Polymarket hosts active prediction markets on the release window.

For the full release timeline, see 📝Claude Mythos Release Date and What We Know So Far.

What Makes It Different

Claude Mythos extends the Claude architecture along three axes:

  1. Deeper reasoning — sustained logical coherence across long, multi-step tasks
  2. Software engineering — top-tier reported results on SWE-bench and code generation benchmarks
  3. Agentic capability — enhanced tool use and autonomous task completion through 📝Model Context Protocol (MCP)

For a builder's read on what the numbers mean, see 📝Claude Mythos Benchmarks.

Not the Same as MythOS

If you arrived here searching for "Mythos AI" and you're looking for an AI knowledge platform — not a model — you want 📝MythOS. MythOS is a platform where your memos, connections, and thinking become a living graph that AI can reason over. It has been operating at mythos.one since 2018. See 📝What is MythOS.

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