JSON mode

Users have the option to set response_format to {"type": "json_object"} to enable JSON mode. It's important to explicitly ask the model to generate JSON output in your message. Currently, JSON mode is available for all of our models through API.

python

from mistralai.client import MistralClient
from mistralai.models.chat_completion import ChatMessage

api_key = os.environ["MISTRAL_API_KEY"]
model = "mistral-large-latest"

client = MistralClient(api_key=api_key)

messages = [
    ChatMessage(role="user", content="What is the best French cheese? Return the product and produce location in JSON format")
]

chat_response = client.chat(
    model=model,
    response_format={"type": "json_object"},
    messages=messages,
)

print(chat_response.choices[0].message.content)

javascript

import MistralClient from '@mistralai/mistralai';

const apiKey = process.env.MISTRAL_API_KEY;

const client = new MistralClient(apiKey);

const chatResponse = await client.chat({
  model: 'mistral-large-latest',
  response_format: {'type': 'json_object'},
  messages: [{role: 'user', content: 'What is the best French cheese? Return the product and produce location in JSON format'}],
});

console.log('Chat:', chatResponse.choices[0].message.content);

curl

curl --location "https://api.mistral.ai/v1/chat/completions" \
     --header 'Content-Type: application/json' \
     --header 'Accept: application/json' \
     --header "Authorization: Bearer $MISTRAL_API_KEY" \
     --data '{
    "model": "mistral-large-latest",
    "messages": [
     {
        "role": "user",
        "content": "What is the best French cheese? Return the product and produce location in JSON format"
      }
    ],
    "response_format": {"type": "json_object"}
  }'