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Cosmos 3 Nano Reasoner

Cosmos
by NVIDIA

Vision language model that excels in understanding the physical world using structured reasoning on videos or images.

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Free EndpointDownloadableJun 1, 2026open license2K API calls / 30d

Specifications

Context Length
131K
131,072 tokens
Input Price
Free
per 1M tokens
Output Price
Free
per 1M tokens
Modalities
3
text→text, image+text→text, video→text

Capabilities

text generationchatvisionreasoning

Tags

video-understandingreasoningphysics-aware

API Usage

1Router is fully OpenAI-compatible. Just set the base URL and use this model ID:

nvidia/cosmos3-nano-reasoner
cURL
curl https://api.1router.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nvidia/cosmos3-nano-reasoner",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'