Post-Cutoff
Search For AI agents

Mistral AIMistral Small familyCurrentReasoning modelReleased 16 Mar 2026

Mistral Small 4

Cheap, fast open model for most production workloads, with optional reasoning.

Model idmistral-small-2603

Price$0.15 in, $0.60 out per 1M tokens

Checked29 September 2026

No published training cutoff

At least1,906events since its release on 16 March 2026

85 historic, 435 major. 242 days of news.

Mistral AI doesn’t publish a training cutoff, so we count from its release date. The real gap is larger.

Five things it has never heard of

How to call it

4 ways to use Mistral Small 4, with the model id each provider expects.

Providers, model ids, endpoints and docs for Mistral Small 4
ProviderModel idEndpointDocs
Mistral API mistral-small-2603 https://api.mistral.ai/v1/chat/completions docs.mistral.ai
OpenRouter mistralai/mistral-small-2603 openrouter.ai
Hugging Face huggingface.co
Web app chat.mistral.ai

Pricing

Prices for Mistral Small 4
Input$0.15 per 1M tokens
Output$0.60 per 1M tokens

As published: “per 1M tokens (USD)”.

Source: docs.mistral.ai, checked 29 September 2026.

Specs

Input
Text and images
Output
Text
Context window
256,000 tokens
Max output
Not published
Open weights
Yes
Licence
Apache-2.0
Training cutoff
Not published
Released
16 March 2026
Status
Current
Type
Reasoning model

What stands out

What its maker marketed at launch, and what people found later, each with its source.

  • Instruct + reasoning + coding unified

    First Mistral model unifying Magistral (reasoning), Pixtral (multimodal) and Devstral (agentic coding) in one model; reasoning_effort none/high per request.

    Source: mistral.ai

  • 119B MoE with ~6.5B active

    119B total / 6.5B active parameters, vision input, 256K context at $0.15/$0.6.

    Source: docs.mistral.ai

Notes

Alias mistral-small-latest (v26.03). Announced Mar 16, 2026.

curl https://api.mistral.ai/v1/chat/completions -H "Authorization: Bearer $MISTRAL_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"mistral-small-latest","messages":[{"role":"user","content":"Hello"}]}'

Sources: https://docs.mistral.ai/models/model-cards/mistral-small-4-0-26-03 , https://mistral.ai/news/mistral-small-4/