Model Tracker
o1-preview
o1-preview is an AI model made by OpenAI. OpenAI released it on 12 September 2024. It is retired. OpenAI retired it on 28 July 2025.
In inglese
o1-preview is an AI model made by OpenAI. OpenAI released it on 12 September 2024. It is retired. OpenAI retired it on 28 July 2025. It takes text and returns text. Its context window is 128,000 tokens. Its longest answer is 32,768 tokens. Its knowledge cutoff is 1 October 2023.
- Released
- 12 September 2024 — openai.com, read 16 October 2026
- Status
- Retired — openai.com, read 16 October 2026
- Retired
- 28 July 2025 — developers.openai.com, read 16 October 2026
- Takes
- Text — developers.openai.com, read 16 October 2026
- Returns
- Text — developers.openai.com, read 16 October 2026
- Open weights
- Not confirmed: The maker's cited pages do not state whether o1-preview has open weights or publish downloadable weights.
- Licence
- Not confirmed: The maker's cited pages do not name a licence for o1-preview.
- Context window
- 128,000 tokens — developers.openai.com, read 16 October 2026
- Longest answer
- 32,768 tokens — developers.openai.com, read 16 October 2026
- Knowledge cutoff
- 1 October 2023 — developers.openai.com, read 16 October 2026
- API price, input
- Not confirmed: The current OpenAI API pricing page does not list o1-preview, so its standard input price cannot be confirmed there.
- API price, output
- Not confirmed: The current OpenAI API pricing page does not list o1-preview, so its standard output price cannot be confirmed there.
- Where
- Not confirmed: The maker documents historical availability in ChatGPT and the API, and confirms API retirement, but the cited pages do not confirm any current serving location for this retired model.
- Parameters
- Not confirmed: The maker's cited pages do not publish the parameter count for o1-preview.
- Model card
- Not confirmed: two readings disagree: https://cdn.openai.com/o1-preview-system-card-20240917.pdf and https://openai.com/index/openai-o1-system-card/
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
- Text Arena, o1-preview: 1,389 (1,384–1,394, 31,122 votes), published 15 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
Epoch AI
- Epoch Capabilities Index, o1-preview: 134.8 (131.1–138.4), as of 19 October 2026
- GPQA Diamond, o1-preview-2024-09-12: 50.3% (± 2.8), run 27 January 2025
- OTIS Mock AIME 2024–2025, o1-preview-2024-09-12: 31.1% (± 7.0), run 7 March 2025
Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0
Questions
When was o1-preview released?
OpenAI released o1-preview on 12 September 2024.
Is o1-preview still available?
No: OpenAI retired o1-preview on 28 July 2025.
What is the context window of o1-preview?
The context window of o1-preview is 128,000 tokens, as OpenAI prints it.
What does o1-preview take and return?
o1-preview takes text and returns text.
What is the knowledge cutoff of o1-preview?
The knowledge cutoff of o1-preview is 1 October 2023.
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
- Deprecations | OpenAI API (read 16 October 2026)
- o1 Preview Model | OpenAI API (read 16 October 2026)
- Introducing OpenAI o1 | OpenAI (read 16 October 2026)
- OpenAI o1 System Card (read 16 October 2026)