OpenAI is bringing o1, its “reasoning” AI model, to its API — but only for certain developers, to start. Starting Tuesday, o1 will begin rolling out to devs in OpenAI’s “tier 5” usage category, the company said. To qualify for tier 5, developers have to spend at least $1,000 with OpenAI and have an account that’s older than 30 days since their first successful payment. O1 replaces the o1-preview model that was already available in the API. Unlike most AI, reasoning models like o1 effectively fac...