Magistral Small API — pricing & specs
Mistral AI's Magistral reasoning model, small tier — step-by-step reasoning at lower cost than the medium tier. On KeepRouter, Magistral Small costs $0.50 per 1M input tokens and $1.50 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 magistral-small-latest.
| Maker | Mistral AI |
|---|---|
| Modality | Text |
| Input price | $0.50 per 1M tokens |
| Output price | $1.50 per 1M tokens |
| Capabilities | Streaming, Tool / function calling |
| APIs | OpenAI-compatible & Anthropic-compatible |
| Model id | magistral-small-latest |
How pricing works for Magistral Small
Magistral Small is billed per token — $0.50 per 1M input tokens and $1.50 per 1M output tokens. As a worked example, a 1,000-token prompt with a 500-token reply costs about $0.0013. All prices are at cost (a 0% markup) with no monthly fee.
Calling Magistral Small on KeepRouter
Point your OpenAI- or Anthropic-compatible client at KeepRouter, set the model to magistral-small-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 $KEEPROUTER_KEY" -H "Content-Type: application/json" \
-d '{"model":"magistral-small-latest","messages":[{"role":"user","content":"Hello"}]}'Python
from openai import OpenAI
client = OpenAI(base_url="https://keeprouter.com/v1", api_key="$KEEPROUTER_KEY")
r = client.chat.completions.create(model="magistral-small-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: "magistral-small-latest", messages: [{ role: "user", content: "Hello" }] });Frequently asked questions
How much does Magistral Small cost on KeepRouter?
Magistral Small is $0.50 per 1M input tokens and $1.50 per 1M output tokens, billed at cost with no markup and no monthly fee.
How much does a typical Magistral Small request cost?
On KeepRouter, a 1,000-token prompt with a 500-token reply costs about $0.0013 — billed at cost with no markup.
Who makes Magistral Small?
Magistral Small is made by Mistral AI. KeepRouter provides it through one OpenAI- and Anthropic-compatible API.
How do I call Magistral Small via API?
Point your OpenAI- or Anthropic-compatible client at KeepRouter and set the model to "magistral-small-latest". It works with the OpenAI SDK, the Anthropic SDK, and Claude Code — no provider-specific SDK needed.
Does Magistral Small support streaming?
Yes. KeepRouter streams Magistral Small responses over both the OpenAI and Anthropic APIs.
Does Magistral Small support tool (function) calling?
Yes. KeepRouter passes tool calls through to Magistral Small and translates them between the OpenAI and Anthropic formats.
Guides
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
- Ministral 14B — $0.20 per 1M input tokens and $0.20 per 1M output tokens
- Ministral 3B — $0.10 per 1M input tokens and $0.10 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.