Model Tracker
GPT-5.1 Chat
GPT-5.1 Chat is an AI model made by OpenAI. OpenAI released it on 12 November 2025. OpenAI retired it on 23 July 2026. It takes text, image and returns text.
GPT-5.1 Chat is an AI model made by OpenAI. OpenAI released it on 12 November 2025. OpenAI retired it on 23 July 2026. It takes text, image and returns text. Its context window is 128,000 tokens. Its longest answer is 16,384 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
- 12 November 2025 — help.openai.com, read 19 October 2026
- Status
- Not confirmed: two readings disagree: retired and deprecated
- Takes
- Text, Image — developers.openai.com, read 19 October 2026
- Returns
- Text — developers.openai.com, read 19 October 2026
- Open weights
- Not confirmed: OpenAI's pages do not state whether GPT-5.1 Chat has open weights.
- Licence
- Not confirmed: OpenAI's pages do not publish a licence for GPT-5.1 Chat.
- Context window
- 128,000 tokens — developers.openai.com, read 19 October 2026
- Longest answer
- 16,384 tokens — developers.openai.com, read 19 October 2026
- Knowledge cutoff
- 30 September 2024 — developers.openai.com, read 19 October 2026
- API price, input
- $1.25 per 1M tokens — developers.openai.com, read 19 October 2026
- API price, output
- $10.00 per 1M tokens — developers.openai.com, read 19 October 2026
- Where
- Not confirmed: two readings disagree: api, app and api
- Parameters
- Not confirmed: OpenAI's pages do not publish a parameter count for GPT-5.1 Chat.
- Model card
- Not confirmed: two readings disagree: https://cdn.openai.com/pdf/4173ec8d-1229-47db-96de-06d87147e07e/5_1_system_card.pdf and https://developers.openai.com/api/docs/models/gpt-5.1-chat-latest
Questions
When was GPT-5.1 Chat released?
OpenAI released GPT-5.1 Chat on 12 November 2025.
What is the context window of GPT-5.1 Chat?
The context window of GPT-5.1 Chat is 128,000 tokens, as OpenAI prints it.
How much does the GPT-5.1 Chat API cost?
On the standard tier, GPT-5.1 Chat costs $1.25 per 1M tokens for input and $10.00 per 1M tokens for output, as OpenAI lists it.
What does GPT-5.1 Chat take and return?
GPT-5.1 Chat takes text, image and returns text.
What is the knowledge cutoff of GPT-5.1 Chat?
The knowledge cutoff of GPT-5.1 Chat is 30 September 2024.
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Sources
- GPT-5.1 Chat Model | OpenAI API (read 19 October 2026)
- Changelog | OpenAI API (read 19 October 2026)
- Deprecations | OpenAI API (read 19 October 2026)
- Pricing | OpenAI API (read 19 October 2026)
- ChatGPT release notes | OpenAI Help Center (read 19 October 2026)
- GPT-5.1 Instant and GPT-5.1 Thinking System Card Addendum (read 19 October 2026)