Mistral: Mistral Small 4

mistralai/mistral-small-2603

Released Mar 16, 2026262,144 context

$0.15/M input tokens$0.60/M output tokens

Mistral Small 4 is the next major release in the Mistral Small family, unifying the capabilities of several flagship Mistral models into a single system. It combines strong reasoning from Magistral, multimodal understanding from Pixtral, and agentic coding capabilities from Devstral, enabling one model to handle complex analysis, software development, and visual tasks within the same workflow.

Providers for Mistral Small 4

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for Mistral Small 4

Compare different providers across OpenRouter

Effective Pricing for Mistral Small 4

Actual cost per million tokens across providers over the past hour

Apps using Mistral Small 4

Top public apps this month

Recent activity on Mistral Small 4

Total usage per day on OpenRouter

Prompt

85.1M

Reasoning

7.47M

Completion

3.46M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for Mistral Small 4

Uptime stats for Mistral Small 4 across all providers

Sample code and API for Mistral Small 4

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.