GPT-5-Codex

GPT-5-Codex

Developer	OpenAI
Release date	September 15, 2025
Family	GPT
Generation	GPT-5
Level
Context window	400K tokens
Max output	128K tokens
Input	Text, image
Output	Text
Knowledge cutoff	2024-09-30
Weights	Closed
Successor	GPT-5.1-Codex
Website	openai.com
Links	Docs

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OpenAI

No longer available

The publisher shut this model down on July 23, 2026. It can no longer be used from its own API. Recommended replacement: gpt-5.6-sol. Publisher notice

Context: 400Ktokens
Released: 1y ago

Specifications

Model

Developer: OpenAI
Family: GPT GPT-5
Type: Language model
Released: September 15, 2025
Model ID: openai/gpt-5-codex

Capabilities

Input → output: Text, image → Text
Max output: 128K tokens
Knowledge cutoff: 2024-09-30

Weights

Openness: Closed

Sources:models.dev

Metadata synced Nov 7, 2026, 3:00 PM UTC