OpenAI o1 API
OpenAI's most advanced model, o1 API to third-party devs
OpenAI o1 API launched on December 20, 2024 with 458 votes, #43 of 5,365 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
OpenAI's o1 API gives developers access to the company's most advanced reasoning model through an API. Designed for complex, multi-step reasoning tasks, it improves upon the earlier o1-preview version with better accuracy, efficiency, and flexibility. The model is intended for developers building applications that require sophisticated problem-solving capabilities.
written from the facts on this page · September 2026
From the sources
The full o1 model is now available to developers through OpenAI’s API, designed to excel at complex, multi-step reasoning tasks. Compared to the earlier o1-preview version, this release improves accuracy, efficiency, and flexibility.
Explore all available models on the OpenAI Platform.
If you're not sure where to start, use GPT-6 Astra , our flagship model for complex reasoning and coding. Choose GPT-5.6 Terra to balance intelligence and cost, or GPT-5.6 Luna for cost-sensitive, high-volume workloads. All latest OpenAI models support text and image input, text output, multilingual capabilities, and vision. Models are available via the Responses API and our Client SDKsfrom developers.openai.com
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Source: Product Hunt launch ↗
