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Mistral: Mistral Small 3.1 24B (2503)

mistralai-small-3.1-24b-instruct

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Mistral Small 3.1 24B (2503) costs $0.130 per million input tokens and $0.390 per million output tokens, supports 128K context, and is available through the OpenAI-compatible API.

Building upon Mistral Small 3 (2501), Mistral Small 3.1 (2503) adds state-of-the-art vision understanding and enhances long context capabilities up to 128k tokens without compromising text performance. With 24 billion parameters, this model achieves top-tier capabilities in both text and vision tasks.

Modalities

Text + Image → Text

Input / output price

$0.130 / $0.390 per 1M

Context

128K · max output 102K

Capabilities

VisionOpen weights

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$0.130
Output$0.390
Cached input$0.065

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00070
Per day
$0.3510
Per month (30 days)
$10.53

Mistral Small 3.1 24B (2503): input $0.13/M · output $0.39/M · cached input $0.065/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "mistralai-small-3.1-24b-instruct", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to mistralai-small-3.1-24b-instruct.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mistralai-small-3.1-24b-instruct",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is Mistral Small 3.1 24B (2503) billed?
Input is $0.130 and output is $0.390 per million tokens; cached input is $0.065. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
128K tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
Mistral Small 3.1 24B (2503) API pricing · GeniusRelay