Mistral Small 4 vs Mistral Small 3.1

Mistral Small 4 vs Mistral Small 3.1 at a glance

Mistral Small 4 and Mistral Small 3.1 are both Mistral AI models in the Text Generation category, available through the EmpirioLabs API.

Key differences

• Mistral Small 4 is the newer release (Mar 16, 2026); Mistral Small 3.1 was released on Mar 17, 2025.
• Mistral Small 4 has the larger context window: 256K tokens, against 89.6K for Mistral Small 3.1.
• Mistral Small 4 returns up to 65,536 output tokens per response, Mistral Small 3.1 up to 32,768.
• Capabilities listed only for Mistral Small 4: web search.

Mistral Small 4 vs Mistral Small 3.1: specs

Mistral Small 4 vs Mistral Small 3.1: API pricing

Live rates from the EmpirioLabs catalog for both models. Each rate card always matches what the API charges.

Mistral Small 4 vs Mistral Small 3.1: API parameters

Request parameters each model lists on EmpirioLabs, with the allowed values or range where one applies. A dash marks a parameter the model does not list.

Mistral Small 4 vs Mistral Small 3.1: limits and notes

Mistral Small 4

Tools (web search, code interpreter, image generation) are billed only when actually invoked. Requests that include your own function tools use standard function calling, and the built-in tools are unavailable on those requests: a request cannot combine both at once. With a built-in tool turned on, input is limited to about 235,000 tokens per request.

Mistral Small 3.1

Input is limited to about 500,000 characters per request.

How to call Mistral Small 4 and Mistral Small 3.1

Mistral Small 4 serves the OpenAI-compatible Chat Completions API. Point any OpenAI SDK at https://api.empiriolabs.ai/v1 with your EmpirioLabs API key and use the model id mistral-small-4. Both models are called through the same endpoint. Set model to mistral-small-4 or mistral-small-3-1. Get an API key from the EmpirioLabs dashboard.

curl https://api.empiriolabs.ai/v1/chat/completions \
  -H "Authorization: Bearer $EMPIRIOLABS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mistral-small-4",
    "messages": [
      {"role": "user", "content": "Write a haiku about the ocean."}
    ]
  }'

Mistral Small 4 vs Mistral Small 3.1: common questions

What is the difference between Mistral Small 4 and Mistral Small 3.1?

Mistral Small 4 is the newer release (Mar 16, 2026); Mistral Small 3.1 was released on Mar 17, 2025. Mistral Small 4 has the larger context window: 256K tokens, against 89.6K for Mistral Small 3.1. Mistral Small 4 returns up to 65,536 output tokens per response, Mistral Small 3.1 up to 32,768. The specs, rate cards, and parameters on this page come from the live EmpirioLabs catalog.

Which is newer, Mistral Small 4 or Mistral Small 3.1?

Mistral Small 4 is the newer release (Mar 16, 2026); Mistral Small 3.1 was released on Mar 17, 2025.

Which has the lower rate, Mistral Small 4 or Mistral Small 3.1?

The two models are priced on different units or tiers, so compare the live rate cards on this page. They always match what the API charges.

Can I switch between Mistral Small 4 and Mistral Small 3.1 without rebuilding my integration?

Yes. Both models use POST /v1/chat/completions with the same EmpirioLabs API key, so most integrations switch by changing the model value. Check the parameters table on this page first if you rely on a model-specific parameter.

Can I try Mistral Small 4 and Mistral Small 3.1 in the browser before integrating?

Yes. Open each model in the EmpirioLabs playground and run the same prompt on both, with the parameters the API exposes.