GPT-5.3 Codex
GPT-5.3 Codex — OpenAI multimodal model with an Intelligence Index of 44, a 922K-token context window and a blended price of $1.05/1M tokens.
Key specifications
| Intelligence Index | 44 |
|---|---|
| Coding Index | — |
| Agentic Index | — |
| Arena Elo | 864 |
| Context window (K tokens) | 922 |
| Blended price ($/1M tokens) | 1.1 |
| Output speed (tokens/s) | 85 |
About GPT-5.3 Codex
The GPT-5.3 Codex is a multimodal model from OpenAI with an Intelligence Index of 44.0 and a 922K-token context window. It runs at a blended price of $1.05 per million tokens and generates about 85 tokens/s. It is proprietary api. Leaderboard indices are a strong signal but only part of real-world quality, which also depends on tool use, latency and task fit.
The comparisons below show how GPT-5.3 Codex stacks up against the alternatives people most often weigh against it, with the specific numbers laid out side by side.
Frequently asked questions
Is the GPT-5.3 Codex any good?
GPT-5.3 Codex — OpenAI multimodal model with an Intelligence Index of 44, a 922K-token context window and a blended price of $1.05/1M tokens.
What are the key specs of the GPT-5.3 Codex?
See the specification table above for the full breakdown.