Ollama Python Library

The Ollama Python library provides the easiest way to integrate Python 3.8+ projects with Ollama.

Prerequisites

• Ollama should be installed and running
• Pull a model to use with the library: ollama pull <model> e.g. ollama pull gemma3
  • See Ollama.com for more information on the models available.

Install

pip install ollama

Usage

from ollama import chat
from ollama import ChatResponse

response: ChatResponse = chat(model='gemma3', messages=[
  {
    'role': 'user',
    'content': 'Why is the sky blue?',
  },
])
print(response['message']['content'])
# or access fields directly from the response object
print(response.message.content)

See _types.py for more information on the response types.

Streaming responses

Response streaming can be enabled by setting stream=True.

from ollama import chat

stream = chat(
    model='gemma3',
    messages=[{'role': 'user', 'content': 'Why is the sky blue?'}],
    stream=True,
)

for chunk in stream:
  print(chunk['message']['content'], end='', flush=True)

Cloud Models

Run larger models by offloading to Ollama’s cloud while keeping your local workflow.

• Supported models: deepseek-v3.1:671b-cloud, gpt-oss:20b-cloud, gpt-oss:120b-cloud, kimi-k2:1t-cloud, qwen3-coder:480b-cloud, kimi-k2-thinking See Ollama Models - Cloud for more information

Run via local Ollama

1. Sign in (one-time):

ollama signin

2. Pull a cloud model:

ollama pull gpt-oss:120b-cloud

3. Make a request:

from ollama import Client

client = Client()

messages = [
  {
    'role': 'user',
    'content': 'Why is the sky blue?',
  },
]

for part in client.chat('gpt-oss:120b-cloud', messages=messages, stream=True):
  print(part.message.content, end='', flush=True)

Cloud API (ollama.com)

Access cloud models directly by pointing the client at https://ollama.com.

1. Create an API key from ollama.com , then set:

export OLLAMA_API_KEY=your_api_key

2. (Optional) List models available via the API:

curl https://ollama.com/api/tags

3. Generate a response via the cloud API:

import os
from ollama import Client

client = Client(
    host='https://ollama.com',
    headers={'Authorization': 'Bearer ' + os.environ.get('OLLAMA_API_KEY')}
)

messages = [
  {
    'role': 'user',
    'content': 'Why is the sky blue?',
  },
]

for part in client.chat('gpt-oss:120b', messages=messages, stream=True):
  print(part.message.content, end='', flush=True)

Custom client

A custom client can be created by instantiating Client or AsyncClient from ollama.

All extra keyword arguments are passed into the httpx.Client.

from ollama import Client
client = Client(
  host='http://localhost:11434',
  headers={'x-some-header': 'some-value'}
)
response = client.chat(model='gemma3', messages=[
  {
    'role': 'user',
    'content': 'Why is the sky blue?',
  },
])

Async client

The AsyncClient class is used to make asynchronous requests. It can be configured with the same fields as the Client class.

import asyncio
from ollama import AsyncClient

async def chat():
  message = {'role': 'user', 'content': 'Why is the sky blue?'}
  response = await AsyncClient().chat(model='gemma3', messages=[message])

asyncio.run(chat())

Setting stream=True modifies functions to return a Python asynchronous generator:

import asyncio
from ollama import AsyncClient

async def chat():
  message = {'role': 'user', 'content': 'Why is the sky blue?'}
  async for part in await AsyncClient().chat(model='gemma3', messages=[message], stream=True):
    print(part['message']['content'], end='', flush=True)

asyncio.run(chat())