AI Model Watch
Models / Anthropic

Claude Mythos Preview

Deprecated

Invitation-only research preview model for defensive cybersecurity workflows under Project Glasswing (no self-serve sign-up). Will be RETIRED on June 30, 2026; recommended migration to Claude Mythos 5 (claude-mythos-5). Standalone per-model pricing not published on the pricing page (Long context note groups it with the 1M-context models at standard pricing, but no $ figures listed) -> prices null. Included in 1M-token context group. Max output / knowledge cutoff not published (null). As of 2026-06-28 the doc lists it as still functional pending the June 30, 2026 retirement; marked 'deprecated'

Lifecycle warning

This model is deprecated. Scheduled shutdown: 30 Jun 2026. Recommended migration: Claude Mythos 5.

Provider
Anthropic
Status
Deprecated
Input price
—
Output price
—
Cached input
—
Blended price
—
Context window
1,000,000 tokens (1M)
Max output
—
Modality
text, image, vision
Knowledge cutoff
—
Released
—
API string
claude-mythos-preview

Source: Anthropic official documentation ↗

See also

Compare Claude Mythos Preview with…

Claude Mythos Preview vs Claude Opus 4.8→

— vs $10 blended /M

Claude Mythos Preview vs Claude Opus 4.7→

— vs $10 blended /M

Claude Mythos Preview vs Claude Opus 4.6→

— vs $10 blended /M

Claude Mythos Preview vs Claude Opus 4.5→

— vs $10 blended /M