Model Tracker
GPT-5.1-Codex Mini
GPT-5.1-Codex Mini is an AI model made by OpenAI. OpenAI released it on 13 November 2025. OpenAI retired it on 23 July 2026.
GPT-5.1-Codex Mini is an AI model made by OpenAI. OpenAI released it on 13 November 2025. OpenAI retired it on 23 July 2026. It takes text, image and returns text. Its context window is 400,000 tokens. Its longest answer is 128,000 tokens. Its knowledge cutoff is 30 September 2024.
- Released
- 13 November 2025 — developers.openai.com, read 16 October 2026
- Status
- Not confirmed: two readings disagree: retired and deprecated
- Takes
- Text, Image — developers.openai.com, read 16 October 2026
- Returns
- Text — developers.openai.com, read 16 October 2026
- Open weights
- Not confirmed: OpenAI's model page and the linked official model materials do not state whether this model's weights are open or downloadable.
- Licence
- Not confirmed: The official model materials do not name a licence for this model.
- 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
- Not confirmed: The current official API pricing page does not list this retired model, so a current standard input price cannot be confirmed.
- API price, output
- Not confirmed: The current official API pricing page does not list this retired model, so a current standard output price cannot be confirmed.
- Where
- API — developers.openai.com, read 16 October 2026
- Parameters
- Not confirmed: OpenAI's official model materials do not publish a parameter count for this model.
- Model card
- Not confirmed: two readings disagree: https://developers.openai.com/api/docs/models/gpt-5.1-codex-mini and https://developers.openai.com/api/docs/models/gpt-5.1-codex-mini.md
Benchmarks
Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.
Arena
- Code Arena (WebDev), GPT-5.1-Codex-Mini: 1,244 (1,222–1,266, 1,154 votes), published 18 October 2026
Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0
Questions
When was GPT-5.1-Codex Mini released?
OpenAI released GPT-5.1-Codex Mini on 13 November 2025.
What is the context window of GPT-5.1-Codex Mini?
The context window of GPT-5.1-Codex Mini is 400,000 tokens, as OpenAI prints it.
What does GPT-5.1-Codex Mini take and return?
GPT-5.1-Codex Mini takes text, image and returns text.
What is the knowledge cutoff of GPT-5.1-Codex Mini?
The knowledge cutoff of GPT-5.1-Codex Mini is 30 September 2024.
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Sources
- GPT-5.1-Codex Mini Model | OpenAI API (read 16 October 2026)
- Changelog | OpenAI API (read 16 October 2026)
- Deprecations | OpenAI API (read 16 October 2026)