When was o1-preview released?

o1-preview was released by OpenAI on Thursday, Sep 12 2024.

o1-preview was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

How much does o1-preview cost?

o1-preview costs $15.00 per million input tokens and $60.00 per million output tokens through the OpenAI API. Cached input is $7.50 per million tokens. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.

What benchmark scores did o1-preview get?

o1-preview reports 1 tracked benchmark score — GPQA Diamond: 73.3%. Scores are the figures published at release by OpenAI.

What is the context window of o1-preview?

o1-preview has a context window of 128k. That is the maximum amount of input plus output the model can hold in a single request.

Is o1-preview open source?

No. o1-preview is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

What came before and after o1-preview?

OpenAI's previous tracked release was GPT-4o mini on Jul 18 2024, 56 days earlier. It was followed by o1-mini on Sep 12 2024.

o1-preview

Released Sep 12 2024

o1-preview is an AI model released by OpenAI on Thursday, Sep 12 2024, 56 days after GPT-4o mini. It has a 128k token context window. Benchmark results (shown below) cover GPQA Diamond.

API pricing

Input: $15.00
Cached input: $7.50
Output: $60.00

Reasoning or thinking is supported.

USD per 1M tokens

Benchmarks

GPQA Diamond

73.3%

#45 of 59

Compare o1-preview with

o1-preview

Suggested comparisons

o1-previewvsGPT-6 Astra o1-previewvsClaude Fable 5.1 o1-previewvsGemini 3.8 Flash o1-previewvsMuse Spark 1.3 o1-previewvsGrok 4.6 o1-previewvsDeepSeek-V4.1-Flash o1-previewvsMistral Medium 3.5 o1-previewvsKimi K3 o1-previewvsGLM-5.3-Flash o1-previewvsQwen3.8-Max-0902 o1-previewvsNemotron 3.5 Lightning

Frequently asked questions

: o1-preview was released by OpenAI on Thursday, Sep 12 2024.
: o1-preview was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
: o1-preview costs $15.00 per million input tokens and $60.00 per million output tokens through the OpenAI API. Cached input is $7.50 per million tokens. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.
: o1-preview reports 1 tracked benchmark score — GPQA Diamond: 73.3%. Scores are the figures published at release by OpenAI.
: o1-preview has a context window of 128k. That is the maximum amount of input plus output the model can hold in a single request.
: No. o1-preview is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
: OpenAI's previous tracked release was GPT-4o mini on Jul 18 2024, 56 days earlier. It was followed by o1-mini on Sep 12 2024.