The original chain-of-thought GPT—still strong in math.
Price per 1 million tokens
per 1M tokens you send
per 1M tokens you receive
Input tokens are what you send to the AI, output tokens are what the AI sends back. These rates are set by the provider and reflect the current OpenAI ChatGPT o1 API pricing. Price accurate as of June 2025.
per month
per month
per month
First reasoning model from OpenAI—same 200-K window as o3, but fewer parameters and slower planning.
The context window is the maximum amount of text the model can "see" at once. Larger windows allow for longer conversations or documents.
Join only me, who has switched to API.chat and is saving on AI expenses while enjoying a better experience.