Claude Sonnet 4 costs $9.65 per million words.
Anthropic lists it at $3 per million input tokens and $15 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 $9.65.
- Maker
- Anthropic
- Input
- $3 per million tokens
- Output
- $15 per million tokens
- Cached input
- $0.30 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 Sonnet 4 in its chat. The nearest model it offers from Anthropic is Claude Sonnet 5.5: $6.43 per million words at Anthropic’s price, $8.04 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 | $9.65 | $3 / $15 |
We began tracking Claude Sonnet 4 on Oct 7, 2026.