Company

OpenAI

Primary category

AI Research Tools

Best for

Researchers, developers, technical operators, and teams working on problems that benefit from deeper reasoning rather than fast chat alone.

Pricing

Available through eligible ChatGPT plans and OpenAI API access; pricing and limits are set by OpenAI plan and API pages.

Free plan

API

yes

Open source/open weight

Linked launches

Latest launch date

September 12, 2024

Last verified

2026-06-08

Verification & Sources

Official site

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What It Does

OpenAI released the first o1 reasoning model preview, designed to spend more time on hard problems in science, coding, and math.

Official site Latest launch profile Company profile

AI Research Tools September 12, 2024

OpenAI released the first o1 reasoning model preview, designed to spend more time on hard problems in science, coding, and math.

Free: No API: Yes Open: No

Clear use caseBeginner-friendlyBusiness-friendlyDeveloper-friendly

Important because it marked OpenAI moving from general chat models toward models optimized for deliberate problem solving.

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