Model Tracker
GPT-5-Codex
GPT-5-Codex is an AI model made by OpenAI. OpenAI released it on 15 September 2025. OpenAI retired it on 23 July 2026. Its context window is 400,000 tokens.
In inglese
GPT-5-Codex is an AI model made by OpenAI. OpenAI released it on 15 September 2025. OpenAI retired it on 23 July 2026. Its context window is 400,000 tokens. Its longest answer is 128,000 tokens. Through the API it costs $1.25 per 1M tokens for input and $10.00 per 1M tokens for output. Its knowledge cutoff is 30 September 2024.
- Released
- 15 September 2025 — openai.com, read 16 October 2026
- Status
- Not confirmed: two readings disagree: retired and ga
- Takes
- Text, Image — developers.openai.com, read 16 October 2026
- Returns
- Not confirmed: two readings disagree: text and text, code
- Open weights
- Not confirmed: The cited maker pages do not state whether GPT-5-Codex weights are open or downloadable.
- Licence
- Not confirmed: The cited maker pages do not name a licence for GPT-5-Codex.
- Context window
- 400,000 tokens — developers.openai.com, read 16 October 2026
- Longest answer
- 128,000 tokens — developers.openai.com, read 16 October 2026
- Knowledge cutoff
- 30 September 2024 — developers.openai.com, read 16 October 2026
- API price, input
- $1.25 per 1M tokens — developers.openai.com, read 16 October 2026
- API price, output
- $10.00 per 1M tokens — developers.openai.com, read 16 October 2026
- Where
- Not confirmed: two readings disagree: api and api, app
- Parameters
- Not confirmed: The cited maker pages do not publish a parameter count for GPT-5-Codex.
- Model card
- https://cdn.openai.com/pdf/97cc5669-7a25-4e63-b15f-5fd5bdc4d149/gpt-5-codex-system-card.pdf — cdn.openai.com, read 16 October 2026
Questions
When was GPT-5-Codex released?
OpenAI released GPT-5-Codex on 15 September 2025.
What is the context window of GPT-5-Codex?
The context window of GPT-5-Codex is 400,000 tokens, as OpenAI prints it.
How much does the GPT-5-Codex API cost?
On the standard tier, GPT-5-Codex costs $1.25 per 1M tokens for input and $10.00 per 1M tokens for output, as OpenAI lists it.
What is the knowledge cutoff of GPT-5-Codex?
The knowledge cutoff of GPT-5-Codex is 30 September 2024.
More from OpenAI
- ada
- babbage
- babbage-002
- code-davinci-002
- computer-use-preview
- curie
- dall-e-3
- DALL·E
- DALL·E 2
- davinci
- davinci-002
- GPT-3.5 Turbo
- GPT-3.5 Turbo Instruct
- GPT-4
- GPT-4 Turbo
- GPT-4.1
- GPT-4.1 mini
- GPT-4.1 nano
- GPT-4.5
- GPT-4.5 Preview
- GPT-4o
- GPT-4o mini
- GPT-4o Mini Search Preview
- GPT-4o Mini Transcribe
Sources
- Introducing upgrades to Codex (read 16 October 2026)
- GPT-5-Codex Model | OpenAI API (read 16 October 2026)
- Deprecations | OpenAI API (read 16 October 2026)
- Addendum to GPT-5 system card: GPT-5-Codex (read 16 October 2026)