mistral-medium-3.5

mistral-medium-3.5 is a efficient-tier language model from Mistral. mistral-medium-3.5 is a proprietary model available exclusively through Mistral's API. Mistral's model family is known for strong performance per parameter, with the 7B model punching well above its weight class and the Mixtral MoE variants delivering near-frontier quality at efficient inference cost.

mistral-medium-3.5 is priced at $1.5/1M input tokens and $7.5/1M output tokens. Output tokens are 5× more expensive than input tokens — this ratio reflects the sequential nature of autoregressive generation, which requires a separate forward pass per output token versus parallel processing of all input tokens simultaneously. At a typical usage pattern of 1,000 input tokens and 500 output tokens per call, mistral-medium-3.5 costs approximately $5.25 per 1,000 API calls. Mistral does not publish a prompt caching rate for this model, so repeated long contexts are billed at the standard $1.5/1M input rate.

Its 131K-token context window handles most long-document tasks — roughly 75,000 words or a full novel — without requiring chunking or retrieval augmentation. Median latency (P50 time-to-first-token) is approximately 380ms — suitable for interactive applications where sub-second response is acceptable. Throughput is approximately 185 tokens/second — fast enough to stream responses at reading speed with headroom for concurrent requests. Maximum output length is 8K tokens — adequate for most generation tasks including essays, code functions, and detailed responses.

mistral-medium-3.5 is best suited to chat, coding, cost. Supported capabilities include vision inputs (images alongside text), function calling / tool use for agentic workflows, streaming token output for real-time UIs. Vision support enables document analysis, screenshot understanding, diagram interpretation, and visual question answering — images are converted to tokens at the standard input rate based on resolution. Function calling support makes it suitable for building AI agents, structured data extraction pipelines, and any workflow requiring the model to invoke external APIs or return typed JSON. When evaluating this model for a specific workload, the most important factors are: context window (does your input fit?), output price (how long are your generations?), and latency (is this interactive or batch?). The pricing table above shows how mistral-medium-3.5 compares to similar models across these dimensions.

mistral-medium-3.5 sits in the efficient tier — optimized for speed and cost while maintaining solid quality, ideal for high-volume or latency-sensitive workloads. Unlike open-weights alternatives, mistral-medium-3.5 is only available via Mistral's API — there is no self-hosted option, which simplifies deployment but creates vendor dependency. When comparing mistral-medium-3.5 to alternatives, use the similar models section on this page to find models at comparable price points with different capability tradeoffs. The intelligence score (68/100) reflects aggregate benchmark performance — a useful proxy for general capability, though real-world performance varies significantly by task type. Always test with your specific prompts and use case before committing to a model for production.