Model profile
GPT-5.3 Codex
ActiveLatest OpenAI coding model with enhanced reasoning capabilities.
Everything you need to evaluate this model before wiring it into production.
gpt-5.3-codexProvider
OpenAI
Launch status
Active
Context window
1.0M
Prompt caching
Supported
Capabilities
Check context size, supported modalities, and output limits before you integrate.
Context window
1.0M
Max output
32.8K
Input modalities
Text, Image
Output modalities
Text
Prompt caching
Supported