Claude Mythos Preview
DeprecatedAn Anthropic model with a 1M-token context window, image input and tool calling. On the Anthropic API since April 7, 2026, now deprecated.
Access details: Anthropic API
The model ID to use in API requests.
claude-mythos-previewUpdated Sep 23, 2026
Capabilities & limits
- Context window
- 1M
- Maximum output
- 128K
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- $25.00
- Output
- $125.00
Standard rates per million tokens. Discounts and long-context rates, where offered, are on Anthropic's pricing page.
Full rate card 2 rates
All prices in USD.
Base input tokens
$25.00 per 1M tokens- Project Glasswing participants
- after the research-preview usage credits
Output tokens
$125.00 per 1M tokens- Project Glasswing participants
- after the research-preview usage credits
Anthropic committed $100M in usage credits to cover Project Glasswing participants during the research preview; afterward the model is priced at $25/$125 per million input/output tokens. Cache and batch rates are not published, and the Claude pricing page does not list this model.
Price history
Sep 23, 2026
Input $25.00 per million tokens
Sep 23, 2026
Output $125.00 per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Not published
- Input modalities
- Text, image
- Output modalities
- Text
From Anthropic
Official announcement ↗Release & lifecycle
- First available
- Apr 7, 2026
- deprecated
- As of Sep 13, 2026