GPT-5.3 Codex
OpenAIProprietary400k context
GPT-5.3 Codex is a proprietary model from OpenAI with a 400k-token context window. 2 providers list it, all at $1.75 per million input tokens and $14.00 per million output tokens.
- Maker
- OpenAI
- Licence
- Proprietary
- Context window
- 400k
- Providers listed
- 2
- Lowest input, per 1M
- $1.75
- Lowest output, per 1M
- $14.00
- OpenAI's own API, per 1M
- $1.75 in · $14.00 out
- Effort settings
- Xhigh
Providers serving GPT-5.3 Codex
Cheapest first, by the blended rate of three input tokens to one output token. Prices in US dollars per million tokens, as of 26 Oct 2026.
| Provider | Input | Output | Context | Tools | JSON mode | OpenAI-compatible | Model ID |
|---|---|---|---|---|---|---|---|
Microsoft Azure | $1.75 | $14.00 | 400k | Yes | Yes | No | gpt-5.3-codex |
OpenAI | $1.75 | $14.00 | 400k | Yes | Yes | Yes | gpt-5.3-codex |