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GPT-5.3 Codex

Most advanced agentic coding model combining frontier coding performance with broader reasoning capabilities.

gpt-5.3-codex
STABLEGet Started
400,000 context
Starting at $1.75/M input tokens
Starting at $14.00/M output tokens
Streaming
Vision
Tools
Reasoning
JSON Output

Select Provider

All Providers for GPT-5.3 Codex

LLM Gateway routes requests to the best providers that are able to handle your prompt size and parameters.

OpenAI
Context: 400k
Input
$1.75
/M tokens
Cached
$0.175
/M tokens
Output
$14
/M tokens
+ $0.010 per search
Get Started
Azure
Context: 400k
Input
$1.75
/M tokens
Cached
$0.175
/M tokens
Output
$14
/M tokens
Get Started