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GPT 5.3 Codex

At a glance

OpenAI's most advanced agentic coding model with 400K context.

87400K ctx$1.75/$14.00 per M#8/92
Agent Demos
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AI Output
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Benchmarks
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Reasoning
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI87.0
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks78.4%Task Horizon5.8h
Specs
400K
Context
128K
Max output
Feb 2026
Released
Capabilities
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$1.75/M tokens
Output$14.00/M tokens
Cache read$0.17/M tokens
Web search$0.01/search
Chat with GPT 5.3 CodexGo to model