GPT-5.3 Codex

Name: GPT-5.3 Codex
Author: OpenAI

Coding-optimized GPT model for repository edits, reviews, and agentic software work

Live

Open / InstallLast updated August 5, 2026

Description

Coding-optimized GPT model for repository edits, reviews, and agentic software work. Supports a context window of 400,000 tokens. Supports extended reasoning. Supports tool calling. Input priced at $1.75 per million tokens. Weights are not publicly released; access is via the provider API.

Author

OpenAI

Platform

api

Pricing model

paid

Capabilities

Text generation
400,000 token context
Extended reasoning
Tool calling
File attachments
Image input

Benchmarks

No benchmark results have been added yet.