Mistral: Mistral Medium 3.5

Mistral Medium 3.5 is a dense 128B instruction-following model from Mistral AI. It supports text and image inputs with text output, and is designed for agentic workflows, coding, and complex multi-step reasoning. It is particularly strong at reliable multi-tool calling and long-horizon tasks, with a 256K context window, configurable reasoning effort per request, and a custom vision encoder that handles variable image sizes and aspect ratios. Self-hostable on as few as four GPUs and available under open weights.

• Context window: 262,144 tokens
• Input: text, image, file
• Output: text
• Pricing: $1.5/M input tokens, $7.5/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.