OpenAI: GPT-5.3-Codex
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...
Specifications
| Attribute | Value |
|---|---|
| Lab | OpenAI |
| Tags | Coding Agentic |
| Release Date | 2026-02 |
| Context Window | 400,000 tokens |
| Input Price / 1M | $1.75 |
| Output Price / 1M | $14.00 |
| Input Modalities | Text, Image, File |
| Output Modalities | Text |
Strengths
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Best For
In Depth: GPT-5.3-Codex
Summary
GPT-5.3-Codex is an AI model from OpenAI.
Released 2026-02. It currently appears in the Overall category on LMRank and 1 other category. It supports Text, Image, File input and produces Text output, with a context window of 400,000 tokens. Input pricing is $1.75 per 1M tokens and output is $14.00 per 1M tokens on OpenRouter.