GPT 5.3 Codex

GPT-5.3-Codex advances both the frontier coding performance of GPT‑5.2-Codex and the reasoning and professional knowledge capabilities of GPT‑5.2, together in one model, which is also 25% faster. This enables it to take on long-running tasks that involve research, tool use, and complex execution.

Model overview

Model ID: openai/gpt-5.3-codex
Provider: openai
Type: language
Context window: 400,000 tokens
Max output tokens: 128,000

Tags: reasoning, tool-use, file-input, vision, implicit-caching

Model pricing

Metric	Value
`Input tokens (/1M)`	`$1.75`
`Output tokens (/1M)`	`$14.00`
`Image generation`	`n/a`
`Cached input read (/1M)`	`$0.17`
`Cached input write (/1M)`	`n/a`
`Pricing source`	`gateway`

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