All Models

OpenAI: GPT-5.3-Codex

Reasoning Tool Calling Attachments

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...

Providers 1
Released Feb 25, 2026
Input Modalities image, text
Output Modalities text
Tarsk Use coding

Benchmarks

53.6
Intelligence Index
53.1
Coding Index

Available Providers (1)

Provider Model ID Input Cost Output Cost Context Max Output Docs
Kilo Gateway openai/gpt-5.3-codex $1.75/MTok $14.00/MTok 400K 128K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output