Ministral 3B API — pricing & specs

Mistral AI's Ministral 3B — the smallest, ultra-light edge-class model for high-throughput, low-cost text tasks. On KeepRouter, Ministral 3B costs $0.10 per 1M input tokens and $0.10 per 1M output tokens, billed at cost with no markup and no monthly fee. Call it through the OpenAI- or Anthropic-compatible API with the model id ministral-3b-latest.

How pricing works for Ministral 3B

Ministral 3B is billed per token — $0.10 per 1M input tokens and $0.10 per 1M output tokens. As a worked example, a 1,000-token prompt with a 500-token reply costs about $0.0001. All prices are at cost (a 0% markup) with no monthly fee.

Calling Ministral 3B on KeepRouter

Point your OpenAI- or Anthropic-compatible client at KeepRouter, set the model to ministral-3b-latest, and keep the rest of your code unchanged. Streaming and tool calling work over both APIs.

cURL

curl https://keeprouter.com/v1/chat/completions \
  -H "Authorization: Bearer $KEEPROUTER_KEY" -H "Content-Type: application/json" \
  -d '{"model":"ministral-3b-latest","messages":[{"role":"user","content":"Hello"}]}'

Python

from openai import OpenAI
client = OpenAI(base_url="https://keeprouter.com/v1", api_key="$KEEPROUTER_KEY")
r = client.chat.completions.create(model="ministral-3b-latest", messages=[{"role":"user","content":"Hello"}])

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://keeprouter.com/v1", apiKey: process.env.KEEPROUTER_KEY });
const r = await client.chat.completions.create({ model: "ministral-3b-latest", messages: [{ role: "user", content: "Hello" }] });

Frequently asked questions

How much does Ministral 3B cost on KeepRouter?

Ministral 3B is $0.10 per 1M input tokens and $0.10 per 1M output tokens, billed at cost with no markup and no monthly fee.

How much does a typical Ministral 3B request cost?

On KeepRouter, a 1,000-token prompt with a 500-token reply costs about $0.0001 — billed at cost with no markup.

Who makes Ministral 3B?

Ministral 3B is made by Mistral AI. KeepRouter provides it through one OpenAI- and Anthropic-compatible API.

How do I call Ministral 3B via API?

Point your OpenAI- or Anthropic-compatible client at KeepRouter and set the model to "ministral-3b-latest". It works with the OpenAI SDK, the Anthropic SDK, and Claude Code — no provider-specific SDK needed.

Does Ministral 3B support streaming?

Yes. KeepRouter streams Ministral 3B responses over both the OpenAI and Anthropic APIs.

Does Ministral 3B support tool (function) calling?

Yes. KeepRouter passes tool calls through to Ministral 3B and translates them between the OpenAI and Anthropic formats.

Guides

• Call Ministral 3B with the OpenAI SDK
• Use Ministral 3B in Claude Code

Related models from Mistral AI

• Codestral — $0.30 per 1M input tokens and $0.90 per 1M output tokens
• Devstral Medium — $0.40 per 1M input tokens and $2 per 1M output tokens
• Magistral Medium — $2 per 1M input tokens and $5 per 1M output tokens
• Magistral Small — $0.50 per 1M input tokens and $1.50 per 1M output tokens
• Ministral 14B — $0.20 per 1M input tokens and $0.20 per 1M output tokens
• Ministral 8B — $0.15 per 1M input tokens and $0.15 per 1M output tokens

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Prices as of 2026-07-05.