Claude Mythos 5
Anthropic · Released 9 Jun 2026 · claude-mythos-5
$10.00
Input price / 1M tokens
$50.00
Output price / 1M tokens
1M
Context window
#29 of 71
–
Output tokens / second
Summary
Claude Mythos 5 is a proprietary model from Anthropic, released on 9 Jun 2026.
Its 1M-token context window ranks #29 of 71.
The Claude Fable 5 model without its safety classifiers, offered by invitation only through Project Glasswing for defensive cybersecurity work; Anthropic describes it as its most capable model for cybersecurity and biology research. Superseded by Claude Mythos 5.1.
Benchmarks · 0 reported
No benchmark score we could source for this model. We show scores only with a source link.
Sources
- price, cache prices, batch, limited availability: platform.claude.com/docs/en/about-claude/pricing, checked 2 Oct 2026
- context, max output, release, api id, knowledge cutoff, invite-only status, platforms: platform.claude.com/docs/en/models/mythos-5/overview, checked 2 Oct 2026
- status, retirement commitment (not sooner than 2027-06-09): platform.claude.com/docs/en/about-claude/model-deprecations, checked 2 Oct 2026
- difference from Fable 5 (no safety classifiers): platform.claude.com/docs/en/models/fable-5/introducing-claude-fable-5-and-claude, checked 2 Oct 2026
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