GPT-5.3-Codex
OpenAI · Multimodal · Released Feb 2026
GPT-5.3-Codex is OpenAI's coding-specialized model from the GPT-5.3 generation with a 400k token context window.
- Strengths
- It handles software development tasks including code generation, debugging, and analysis across large codebases.
- Best for
- Projects requiring code-focused reasoning over extended contexts, such as refactoring large files or understanding complex multi-file systems.
- Limitations
- It is superseded by GPT-5.2-Codex from a later release date, making it the older model in OpenAI's coding lineage.
Input / 1M
$1.75
Output / 1M
$14.00
Cached input / 1M
$0.175
Context window
400K
Price history
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 11 Jun 2026 | $1.75 | $14.00 | $0.175 | Imported from OpenRouter | openrouter.ai |