OpenAI

GPT-5.3 Codex

OpenAI•Documentation

gpt-5.3-codex

OpenAI's most capable agentic coding model. Combines Codex and GPT-5 training stacks for best-in-class code generation, reasoning, and general-purpose intelligence. 25% faster than its predecessor. Optimized for long-running agentic coding tasks.

Use this model with Aisle

Have natural conversations with the model in a familiar interface

Automate tasks, share with your team, and deploy to chat

Test prompt variants, model settings, and compare models side by side

Chain prompts together for complex automation and outcomes

Context Window

400K

tokens

Max Output

128,000

tokens

Web Search

Available

Structured Output

Available

Supported File Formats

Images

WEBP(20 MB)PNG(20 MB)JPEG(20 MB)GIF(20 MB)

Documents

pdftextdocxlsrtfdocxxlsxpptxpptodtodpods