GPT-5.3 Codex costs $5.40 per million words.
OpenAI lists it at $1.75 per million input tokens and $14 per million output tokens on OpenAI’s pricing page, read 4:40 PM Eastern, Oct 7, 2026. It bills about 1,123 tokens for a thousand English words, so a million words, three in for every one out, costs $5.40.
- Maker
- OpenAI
- Input
- $1.75 per million tokens
- Output
- $14 per million tokens
- Cached input
- $0.17 per million tokens
- Tokens for 1,000 words
- 1,123, measured by Brass on Oct 7, 2026
- Source
- OpenAI’s pricing page
Brass does not offer GPT-5.3 Codex in its chat. The nearest model it offers from OpenAI is GPT-6.1 Sol: $4.49 per million words at OpenAI’s price, $5.61 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 | $5.40 | $1.75 / $14 |
We began tracking GPT-5.3 Codex on Oct 7, 2026.