openai/o1

OpenAI's first o-series reasoning model

Capabilities

Reference Images System Prompt

Cost

Community model (estimated from hardware time)

Input Parameters

Name	Type	Description	Default	Constraints
`image_input`	array	List of images to send to the model		—
`max_completion_tokens`	integer	Maximum number of completion tokens to generate	`4096`	—
`messages`	array	A JSON string representing a list of messages. For example: [{"role": "user", "content": "Hello, how are you?"}]. If provided, prompt and system_prompt are ignored.		—
`prompt`	string	The prompt to send to the model. Do not use if using messages.	`—`	—
`reasoning_effort`	string	Constrains effort on reasoning for reasoning models. Currently supported values are low, medium, and high. Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.	`"medium"`	low medium high
`system_prompt`	string	System prompt to set the assistant's behavior	`—`	—

image_input array

List of images to send to the model

Default:

max_completion_tokens integer

Maximum number of completion tokens to generate

Default: 4096

messages array

A JSON string representing a list of messages. For example: [{"role": "user", "content": "Hello, how are you?"}]. If provided, prompt and system_prompt are ignored.

Default:

prompt string

The prompt to send to the model. Do not use if using messages.

reasoning_effort string

Constrains effort on reasoning for reasoning models. Currently supported values are low, medium, and high. Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.

Default: "medium"

low medium high

system_prompt string

System prompt to set the assistant's behavior

Version: 729043ff117d Updated: 2/26/2026 16.4K runs