Grok 4.20 Multi Agent 0309 costs $1.76 per million words.
xAI lists it at $1.25 per million input tokens and $2.50 per million output tokens on xAI’s pricing page, read 4:40 PM Eastern, Oct 7, 2026. It bills about 1,129 tokens for a thousand English words, so a million words, three in for every one out, costs $1.76.
- Maker
- xAI
- Input
- $1.25 per million tokens
- Output
- $2.50 per million tokens
- Cached input
- $0.20 per million tokens
- Tokens for 1,000 words
- 1,129, estimated from xAI’s other measured models, since we have not been able to measure this one
- Source
- xAI’s pricing page
Brass does not offer Grok 4.20 Multi Agent 0309 in its chat. The only xAI model in the Brass chat is Grok 4.7: $3.39 per million words at xAI’s price, $4.23 in the Brass chat. The lowest-priced model in the Brass chat is DeepSeek V4.1 Flash, at $0.74 per million words.
To use the models Brass offers, buy a pack.
Price history
| From | Per million words | Per million tokens, in / out |
|---|---|---|
| Oct 7, 2026 | $1.76 | $1.25 / $2.50 |
We began tracking Grok 4.20 Multi Agent 0309 on Oct 7, 2026.