OpenAI announced Tuesday that the company is bringing o1, its "reasoning" artificial intelligence (AI) model, to its application programming interface (API) for certain users.

Starting Tuesday, o1 will begin rolling out to the community of software developers in OpenAI's "tier 5" usage category, the company said.

To qualify for tier 5, developers have to spend at least 1,000 U.S. dollars with OpenAI and have an account that's older than 30 days since their first successful payment.

"We are rolling out access incrementally while working to expand access to additional usage tiers and ramping up rate limits," the company wrote in a blog post.

Unlike most AI, reasoning models like o1 can effectively fact-check themselves.

OpenAI said that the version of o1 in the API is a "new post-trained" version of o1. Compared to the o1 model released in ChatGPT two weeks ago, the new version makes improvements on "areas of model behavior based on feedback."

OpenAI on Tuesday also announced new versions of its GPT-4o and GPT-4o mini models as part of the Realtime API. The new versions, which boast improved data efficiency and reliability, are also cheaper to use, OpenAI said.

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