free-ai-api-keys

mistralai/mistral-small-2603

Mistral: Mistral Small 4

Context length
262K
Input / 1M tokens
$0.15
Output / 1M tokens
$0.60
Released
2026-03-16
Modality
text+image->text

About Mistral: Mistral Small 4

Mistral Small 4 is the next major release in the Mistral Small family, unifying the capabilities of several flagship Mistral models into a single system. It combines strong reasoning from...

Call Mistral: Mistral Small 4

Via OpenRouter: one base URL for every provider.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mistralai/mistral-small-2603",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Direct on Mistral AI:

curl https://api.mistral.ai/v1/chat/completions \
  -H "Authorization: Bearer $MISTRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mistral-small-2603",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Mistral AI keys

OpenRouter keys

OpenRouter keys work for mistralai/mistral-small-2603 regardless of the upstream provider.