OpenAI Responses
gpt-5.3-codex
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.
👁Vision🧠Reasoning🔧Tool calling⚡Caching
Pricing per 1M tokens
Input
$1.75
Output
$14.00
Cache write
$14.00
Cache read
$0.17
Specifications
Context window400K tokens
Max output128K tokens
API typechat
AddedFeb 25, 2026
Model IDopenai-responses/gpt-5.3-codex
Privacy & data
Data retentionYes (30 days)
Used for trainingNo
Provider location🇺🇸 US
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