Mistral AI: Mistral Medium 3.5

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Mistral Medium 3.5 is Mistral AI's dense 128B instruction-following model, released 2026-04. Built for agentic workflows, coding, and complex multi-step reasoning, it is particularly strong at reliable multi-tool calling and long-horizon tasks. A custom vision encoder handles variable image sizes and aspect ratios, and the model is self-hostable on as few as four GPUs under open weights.

MirAPI doesn’t offer this model. The prices shown are the official list prices.

Modalities
inTextinImageinFileoutText
Price / 1M
$1.50 / $7.50
Context
262K
Released
Apr 30, 2026

Capabilities

ReasoningVisionTool useLong contextStructured output

Parameters

Request parameters this model accepts through the API.

frequency_penaltyinclude_reasoningmax_tokenspresence_penaltyreasoningreasoning_effortresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_p

Benchmarks

bar = score (0–100) · ▏ median

Scores come from vendor reports and public leaderboards, not private evals.

Intelligence Index
General ability
14.2
#103
Coding Index
Code
46.9
#47
Agentic Index
Agentic
7.0
#45

Showcase

Every chat model gets the same three fixed prompts. Outputs are archived verbatim, so you can copy a prompt and reproduce the result.

Task prompt · identical for all models
Build a single-file HTML page using three.js from a CDN: a low-poly planet with a tilted ring of ~200 orbiting particles, a soft key light plus rim light, slow auto-rotation, and drag-to-orbit controls. No build tools — one file only.
Archived output
Archive not published yet

Every model will run this exact prompt, and its output will appear here verbatim with token counts and the cost per run.

Quick start

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.mirapi.ai/v1",   # changed
    api_key=os.environ["MIRAPI_API_KEY"],   # changed
)

resp = client.chat.completions.create(
    model="",
    messages=[{"role": "user", "content": "Hello"}],
)
Wire Mistral Medium 3.5 into your product

1M free tokens to start, no card required. It’s OpenAI-compatible, so you only change the base URL.

Start free