GPT-5.3-Codex

GPT-5.3-Codex

Developer	OpenAI
Release date	February 5, 2026
Family	GPT
Generation	GPT-5.3
Level
Context window	400K tokens
Max output	128K tokens
Input	Text, image, file
Output	Text
Knowledge cutoff	2025-08-31
Weights	Closed
Predecessor	GPT-5.2-Codex
Website	openai.com

Part of a series on

input: $1.75
cached: $0.175
output: $14.00
Context: 400Ktokens
Released: 9mo ago

Specifications

Model

Developer: OpenAI
Family: GPT GPT-5.3
Type: Language model
Released: February 5, 2026
Model ID: openai/gpt-5.3-codex

Capabilities

Input → output: Text, image, file → Text
Max output: 128K tokens
Tokenizer: GPT
Knowledge cutoff: 2025-08-31

Weights

Openness: Closed

Sources:models.devOpenRouter

Metadata synced Nov 12, 2026, 12:17 PM UTC

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