LLM Reference
OpenRouter

Using Mistral Small 4 on OpenRouter

Implementation guide · Mistral Small · MistralAI

ServerlessOpen Source

OpenRouter exposes Mistral Small 4 through model ID mistralai/mistral-small-2603. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-15. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenRouter and generate an API key.
  2. 2
    Use the OpenRouter SDK or REST API to call mistralai/mistral-small-2603 — see the documentation for request format.
  3. 3
    You'll be billed $0.15/1M input, $0.60/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$0.15
Output tokens$0.60

Capabilities

VisionMultimodalJSON / Tool use

About Mistral Small 4

Mistral Small 4 is a hybrid 119B MoE model unifying instruct, reasoning, and coding capabilities. Features configurable reasoning effort per request and native function calling with JSON output support.

Full model details →

Model Specs

Released2026-03-16
Parameters119B (6.5B active)
Context256k
ArchitectureMixture of Experts
Knowledge cutoff2025-06

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Also available on(2)

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Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA