Claude Mythos Preview
Our most capable frontier model to date.
A preview Claude model release from Anthropic described in the discovery context as having restricted access for defensive security work through Project Glasswing.
Pricing
Official site · Sep 23, 2026, 9:10 AM
Input / 1M
$25.00
Output / 1M
$125.00
Gated research preview pricing: $25/$125 per million input/output tokens. Anthropic also committed usage credits during the research preview.
Anthropic's official Project Glasswing page explicitly lists Claude Mythos Preview at $25 per million input tokens and $125 per million output tokens for Project Glasswing participants, accessible through the Claude API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry. Access is a gated research preview; no separate cached-input price is stated.
Model Intelligence
Benchmarkable
Yes
Model level
release
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