Model Tracker
o1-mini
o1-mini is an AI model made by OpenAI. OpenAI released it on 12 September 2024. It is retired. OpenAI retired it on 27 October 2025.
o1-mini is an AI model made by OpenAI. OpenAI released it on 12 September 2024. It is retired. OpenAI retired it on 27 October 2025. It takes text and returns text. Its context window is 128,000 tokens. Its longest answer is 65,536 tokens. Through the API it costs $1.10 per 1M tokens for input and $4.40 per 1M tokens for output. Its knowledge cutoff is October 2023.
- Released
- 12 September 2024 — cdn.openai.com, read 16 October 2026
- Status
- Retired — developers.openai.com, read 16 October 2026
- Retired
- 27 October 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 pages reviewed do not state whether o1-mini's weights are open or downloadable.
- Licence
- Not confirmed: The maker's pages reviewed do not name a licence for o1-mini.
- Context window
- 128,000 tokens — developers.openai.com, read 16 October 2026
- Longest answer
- 65,536 tokens — developers.openai.com, read 16 October 2026
- Knowledge cutoff
- October 2023 — developers.openai.com, read 16 October 2026
- API price, input
- $1.10 per 1M tokens — developers.openai.com, read 16 October 2026
- API price, output
- $4.40 per 1M tokens — developers.openai.com, read 16 October 2026
- Where
- Not confirmed: two readings disagree: api, app and api
- Parameters
- Not confirmed: The maker's pages reviewed do not publish a parameter count for o1-mini.
- Model card
- Not confirmed: two readings disagree: https://cdn.openai.com/o1-system-card-20241205.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-mini: 1,337 (1,333–1,340, 51,981 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-mini: 135.8 (132.0–137.3), as of 19 October 2026
- GPQA Diamond, o1-mini-2024-09-12_high: 62.4% (± 2.7), run 13 February 2025
- GPQA Diamond, o1-mini-2024-09-12_medium: 59.5% (± 2.8), run 27 January 2025
- OTIS Mock AIME 2024–2025, o1-mini-2024-09-12_high: 46.9% (± 6.5), run 6 March 2025
- OTIS Mock AIME 2024–2025, o1-mini-2024-09-12_medium: 44.7% (± 6.3), run 6 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-mini released?
OpenAI released o1-mini on 12 September 2024.
Is o1-mini still available?
No: OpenAI retired o1-mini on 27 October 2025.
What is the context window of o1-mini?
The context window of o1-mini is 128,000 tokens, as OpenAI prints it.
How much does the o1-mini API cost?
On the standard tier, o1-mini costs $1.10 per 1M tokens for input and $4.40 per 1M tokens for output, as OpenAI lists it.
What does o1-mini take and return?
o1-mini takes text and returns text.
What is the knowledge cutoff of o1-mini?
The knowledge cutoff of o1-mini is October 2023.
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Sources
- o1-mini Model | OpenAI API (read 16 October 2026)
- Deprecations | OpenAI API (read 16 October 2026)
- OpenAI o1-mini (read 16 October 2026)
- OpenAI o1 System Card (read 16 October 2026)