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Create assistant (v1)
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post https://api.openai.com/v1/assistants

Create an assistant with a model and instructions.source

Request body

model

stringsource

Required

ID of the model to use. You can use the List models API to see all of your available models, or see our Model overview for descriptions of them. type: stringsource

name

string or nullsource

Optional

The name of the assistant. The maximum length is 256 characters.source

description

string or nullsource

Optional

The description of the assistant. The maximum length is 512 characters.source

instructions

string or nullsource

Optional

The system instructions that the assistant uses. The maximum length is 256,000 characters.source

tools

arraysource

Optional
Defaults to []

A list of tool enabled on the assistant. There can be a maximum of 128 tools per assistant. Tools can be of types code_interpreter, retrieval, or function.source

file_ids

arraysource

Optional
Defaults to []

A list of file IDs attached to this assistant. There can be a maximum of 20 files attached to the assistant. Files are ordered by their creation date in ascending order.source

metadata

mapsource

Optional

Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format. Keys can be a maximum of 64 characters long and values can be a maxium of 512 characters long.source

temperature

number or nullsource

Optional
Defaults to 1

What sampling temperature to use, between 0 and 2. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic.source

top_p

number or nullsource

Optional
Defaults to 1

An alternative to sampling with temperature, called nucleus sampling, where the model considers the results of the tokens with top_p probability mass. So 0.1 means only the tokens comprising the top 10% probability mass are considered.source

We generally recommend altering this or temperature but not both.source

response_format

string or objectsource

Optional

Specifies the format that the model must output. Compatible with GPT-4o, GPT-4 Turbo, and all GPT-3.5 Turbo models since gpt-3.5-turbo-1106.source

Setting to { "type": "json_object" } enables JSON mode, which guarantees the message the model generates is valid JSON.source

Important: when using JSON mode, you must also instruct the model to produce JSON yourself via a system or user message. Without this, the model may generate an unending stream of whitespace until the generation reaches the token limit, resulting in a long-running and seemingly "stuck" request. Also note that the message content may be partially cut off if finish_reason="length", which indicates the generation exceeded max_tokens or the conversation exceeded the max context length.source

Returns

An assistant object.source

Example request
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curl "https://api.openai.com/v1/assistants" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "OpenAI-Beta: assistants=v1" \
  -d '{
    "instructions": "You are a personal math tutor. When asked a question, write and run Python code to answer the question.",
    "name": "Math Tutor",
    "tools": [{"type": "code_interpreter"}],
    "model": "gpt-4-turbo"
  }'
Response
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{
  "id": "asst_abc123",
  "object": "assistant",
  "created_at": 1698984975,
  "name": "Math Tutor",
  "description": null,
  "model": "gpt-4-turbo",
  "instructions": "You are a personal math tutor. When asked a question, write and run Python code to answer the question.",
  "tools": [
    {
      "type": "code_interpreter"
    }
  ],
  "file_ids": [],
  "metadata": {},
  "top_p": 1.0,
  "temperature": 1.0,
  "response_format": "auto"
}