OpenAI: GPT-5.3-Codexopenai
OpenAI: GPT-5.3-Codex: $1.75/1M input, $14.00/1M output, 400K context, CPS grade B. GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
API Pricing (per 1M tokens)
| Input | $1.75 |
| Output | $14.00 |
| Cache Read | — |
| Cache Write | — |
| Blended (3:1) | $4.81 |
Specs & Performance
| Context Length | 400K |
| Max Output | 128K |
| Intelligence | 33 |
| Coding | 53 |
| Math | — |
| Speed | 79 tok/s |
| TTFT | 42.47s |
| CPS Grade | B |
| Input / Output Modalities | text, image, file → text |
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FAQ
How much does the OpenAI: GPT-5.3-Codex API cost?
OpenAI: GPT-5.3-Codex costs $1.75/1M input tokens and $14.00/1M output tokens. Blended cost at a 3:1 ratio is about $4.81/1M tokens.
What is the context window of OpenAI: GPT-5.3-Codex?
OpenAI: GPT-5.3-Codex supports a 400K token context window with up to 128K output tokens.
Is OpenAI: GPT-5.3-Codex worth it?
OpenAI: GPT-5.3-Codex has a CPS grade of B (score 59), intelligence index 33, coding index 53. Use the compare page to benchmark against rivals.