As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/mistral-small-4/

# Mistral Small 4

Mistral AI, Mistral Small family. Status: current. Type: reasoning model. Released: 2026-03-16. Training cutoff: not published.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Mistral API | `mistral-small-2603` | https://api.mistral.ai/v1/chat/completions | https://docs.mistral.ai/models/model-cards/mistral-small-4-0-26-03 |
| OpenRouter | `mistralai/mistral-small-2603` |  | https://openrouter.ai/mistralai/mistral-small-2603 |
| Hugging Face |  |  | https://huggingface.co/mistralai/Mistral-Small-4-119B-2603 |
| Web app |  |  | https://chat.mistral.ai |

## Pricing

- Input: $0.15 per 1M tokens
- Output: $0.60 per 1M tokens
- Unit as published: per 1M tokens (USD)
- Source: https://docs.mistral.ai/models/model-cards/mistral-small-4-0-26-03
- Last checked: 2026-09-29

## Specs

- Input: text, image
- Output: text
- Context window: 256,000 tokens
- Max output: not published
- Open weights: yes
- Licence: apache-2.0

## What it has not seen

- No published training cutoff. Counted from its release (2026-03-16): at least 1,906 AI events since (435 major, 85 historic), as of 2026-11-13.
- Everything since February 2026: https://postcutoff.com/since/2026-02/

## What stands out

- 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: https://mistral.ai/news/mistral-small-4/
- 119B MoE with ~6.5B active: 119B total / 6.5B active parameters, vision input, 256K context at $0.15/$0.6. Source: https://docs.mistral.ai/models/model-cards/mistral-small-4-0-26-03

## Notes

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

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

```bash
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/

Model page: https://postcutoff.com/m/mistral-small-4/