Model Tracker

o1

o1 is an AI model made by OpenAI. It is deprecated. It takes text, image and returns text. Its context window is 200,000 tokens.

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OpenAI

o1 is an AI model made by OpenAI. It is deprecated. It takes text, image and returns text. Its context window is 200,000 tokens. Its longest answer is 100,000 tokens. Through the API it costs $15.00 per 1M tokens for input and $60.00 per 1M tokens for output. Its knowledge cutoff is 1 October 2023.

Released: Not confirmed: two readings disagree: 2024-12-05 and 2024-12-17
Status: Deprecated — developers.openai.com, read 16 October 2026
Takes: Text, Image — developers.openai.com, read 16 October 2026
Returns: Text — developers.openai.com, read 16 October 2026
Open weights: Not confirmed: The cited official model and system-card pages do not state whether o1's weights are open or downloadable.
Licence: Not confirmed: The cited official model and system-card pages do not name a licence for o1.
Context window: 200,000 tokens — developers.openai.com, read 16 October 2026
Longest answer: 100,000 tokens — developers.openai.com, read 16 October 2026
Knowledge cutoff: 1 October 2023 — developers.openai.com, read 16 October 2026
API price, input: $15.00 per 1M tokens — developers.openai.com, read 16 October 2026
API price, output: $60.00 per 1M tokens — developers.openai.com, read 16 October 2026
Where: API — developers.openai.com, read 16 October 2026
Parameters: Not confirmed: The cited official model and system-card pages do not publish a parameter count for o1.
Model card: Not confirmed: two readings disagree: https://cdn.openai.com/o1-system-card.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, o1-2024-12-17: 1,402 (1,398–1,407, 27,807 votes), published 15 October 2026
Vision Arena, o1-2024-12-17: 1,193 (1,182–1,203, 3,694 votes), published 9 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: 141.8 (139.5–142.9), as of 19 October 2026
GPQA Diamond, o1-2024-12-17_high: 76.8% (± 3.0), run 13 February 2025
GPQA Diamond, o1-2024-12-17_medium: 75.8% (± 3.1), run 27 January 2025
GPQA Diamond, o1-2024-12-17_low: 74.2% (± 3.1), run 20 July 2026
FrontierMath, tiers 1–3, o1-2024-12-17_high: 14.7% (± 2.1), run 28 August 2026
FrontierMath, tiers 1–3, o1-2024-12-17_medium: 10.2% (± 1.8), run 27 August 2026
FrontierMath, tiers 1–3, o1-2024-12-17_low: 8.4% (± 1.6), run 27 August 2026
OTIS Mock AIME 2024–2025, o1-2024-12-17_high: 73.3% (± 6.7), run 15 July 2026
OTIS Mock AIME 2024–2025, o1-2024-12-17_medium: 73.3% (± 6.7), run 27 February 2025
OTIS Mock AIME 2024–2025, o1-2024-12-17_low: 53.3% (± 7.5), run 15 July 2026
SimpleQA Verified, o1-2024-12-17_high: 41.1% (± 1.6), run 31 August 2026

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

Is o1 still available?

It is deprecated: OpenAI has announced the date it will retire it.

What is the context window of o1?

The context window of o1 is 200,000 tokens, as OpenAI prints it.

How much does the o1 API cost?

On the standard tier, o1 costs $15.00 per 1M tokens for input and $60.00 per 1M tokens for output, as OpenAI lists it.

What does o1 take and return?

o1 takes text, image and returns text.

What is the knowledge cutoff of o1?

The knowledge cutoff of o1 is 1 October 2023.

Sources

o1 Model | OpenAI API (read 16 October 2026)
Deprecations | OpenAI API (read 16 October 2026)
Introducing ChatGPT Pro (read 16 October 2026)
OpenAI o1 System Card (read 16 October 2026)

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