⚠️ This article is about the state of access to the full o1 and o3-mini models in the API and does not cover o1 / o3-mini access in ChatGPT.
What is my usage tier and what models can I use?
Navigate to the Limits menu in the API Platform dashboard to see your usage tier and what models you have access to.
Who has access to o1, o1-preview, o1-mini, and o3-mini in the API currently?
o1 (includes o1 and o1‐2024‐12‐17)
A subset of API users on usage tiers 3, 4, and 5 (not all Tier 3–5 users have access yet).
Now also available on the Assistants API and in our Batch API (alongside other o‐series models).
o1‐preview
API users on usage tiers 1+
Now included with other o‐series models in our Batch API.
o1‐mini
API users on usage tiers 1+
Now available on Assistants and in our Batch API (first time reasoning models are on these endpoints).
o3‐mini (including o3‐mini‐2025‐01‐31)
Access to o3-mini is rolling out to select API users across trust tiers 3 through 5. We hope to rapidly expand access in the days and weeks ahead.
Supports function calling, Structured Outputs, reasoning effort, streaming, and developer messages.
Available on Chat Completions, Assistants, and our Batch API.
When will I get access to o1 or o3-mini in the API if I don’t have it yet?
While we don’t have specific dates for users who haven’t been included in the rollout yet, we’re working to expand access as quickly as possible. We plan to notify users via email when access is granted.