# GPT-5.3-Codex (slim)

> GPT-5.3-Codex, a family of models by OpenAI, listed from OpenRouter. Indexed, not reviewed: facts and our own checks, no score or ranking. GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex…

- Full: https://www.anchorterminal.com/tools/gpt-5-3-codex.md (~500 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/tools/gpt-5-3-codex.json · canonical https://www.anchorterminal.com/tools/gpt-5-3-codex
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

# GPT-5.3-Codex

> Indexed, not reviewed: facts from OpenRouter and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: model family, by OpenAI
- Category: Model APIs & inference (https://www.anchorterminal.com/categories/inference.md)
- Listed because: OpenRouter lists it, with prices from the providers that serve it.
- What OpenRouter says: 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...

## Models (1)

| Model | OpenRouter id | Released | Context | Input $/1M | Output $/1M | Supports |
| --- | --- | --- | --- | --- | --- | --- |
| GPT-5.3-Codex | `openai/gpt-5.3-codex` | 2026-02 | 400k | $1.75 | $14 | tools, structured output, reasoning, caching, file, image |

Prices and limits as OpenRouter lists them; a provider's own price can differ.

- JSON: https://www.anchorterminal.com/api/v1/tools/gpt-5-3-codex.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming