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Magistral Small 2509

mistral/magistral-small

Magistral Small 2509 is a 24B open-source reasoning model under Apache 2.0 with 70.7% on AIME 2024. It's Mistral AI's compact reasoning option in the Magistral family.

ReasoningVision (Image)
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'mistral/magistral-small',
  prompt: 'Why is the sky blue?'
})

What To Consider When Choosing a Provider

  • Zero Data Retention

    AI Gateway supports Zero Data Retention for this model via direct gateway requests (BYOK is not included). To configure this, check the documentation.

    Authentication

    AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.

Magistral Small 2509's Apache 2.0 license makes it the only reasoning model in the Magistral family that can be freely incorporated into commercial products without a separate licensing agreement.

When to Use Magistral Small 2509

Best For

  • Apache 2.0 commercial products:

    Need this license for reasoning model integration

  • Cost-sensitive reasoning workloads:

    Applications where the 70.7% AIME 2024 score is sufficient

  • Research and educational use:

    Cases requiring transparent, auditable reasoning

Consider Alternatives When

  • Highest reasoning accuracy:

    You need the top option (consider Magistral Medium at 73.6%)

  • No structured reasoning needed:

    The task does not require multi-step reasoning at all

Conclusion

Magistral Small 2509 reaches 70.7% on AIME 2024 with transparent chain-of-thought and Apache 2.0 licensing. Access it through AI Gateway for reasoning workloads without proprietary model lock-in.

FAQ

70.7% on AIME 2024 and 83.3% with majority voting.

24B parameters under Apache 2.0, available for download from Hugging Face.

Yes. Like Magistral Medium, Magistral Small 2509 exposes step-by-step reasoning traces for each response.

English, French, Spanish, German, Italian, Arabic, Russian, and Simplified Chinese, the same set as Magistral Medium.

Magistral Small 2509 is 24B parameters and open-source. Magistral Medium is the larger, API-first release. On AIME 2024, Small is 70.7% single-sample versus Medium at 73.6%; the gap is most visible on heavy math, less on typical business prompts.

Yes. You can access Magistral Small 2509 through AI Gateway.