Claude Mythos 5.1 costs $32.17 per million words.
Anthropic lists it at $10 per million input tokens and $50 per million output tokens on Anthropic’s pricing page, read 4:40 PM Eastern, Oct 7, 2026. It bills about 1,608 tokens for a thousand English words, so a million words, three in for every one out, costs $32.17.
- Maker
- Anthropic
- Input
- $10 per million tokens
- Output
- $50 per million tokens
- Cached input
- $0.25 per million tokens
- Tokens for 1,000 words
- 1,608, estimated from Anthropic’s other measured models, since we have not been able to measure this one
- Source
- Anthropic’s pricing page
Brass does not offer Claude Mythos 5.1 in its chat. The nearest model it offers from Anthropic is Claude Fable 5.1: $32.17 per million words at Anthropic’s price, $40.21 in the Brass chat.
To use the models Brass offers, buy a pack.
Price history
| From | Per million words | Per million tokens, in / out |
|---|---|---|
| Oct 7, 2026 | $32.17 | $10 / $50 |
We began tracking Claude Mythos 5.1 on Oct 7, 2026.