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nemotron-chat

NVIDIA Nemotron 3 — a free 120B model with a 262K context window.

0.0(0 reviews)3 invocations1credits / call
#nemotron#nvidia#openrouter#llm#chat-completion#free#byok#fast
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mock screenshot

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About

nemotron-chat wraps NVIDIA's Nemotron 3 family. The default, Nemotron 3 Super 120B-A12B, is a sparse mixture-of-experts model with a 262K context window; pass `nvidia/nemotron-3.5-lightning:free` when you want speed over depth — it carries a 1M context window and answers faster. Both cost nothing per token.

Use it where you'd reach for a `-mini` / `-flash` model: routing decisions inside an agent loop, tagging, rewriting, quick Q&A.

**Modes:** • **Managed** — set `OPENROUTER_API_KEY` on the host. 1 credit per call. Allowed: `nvidia/nemotron-3-super-120b-a12b:free` (default), `nvidia/nemotron-3.5-lightning:free`. • **BYO key** — pass your own OpenRouter `apiKey`; 1-credit routing fee, any model id accepted. • **Mock** — neither set → canned echo, refunded to 0 credits.

Response includes `usage.costUsd`, which reads $0 on free models. Managed mode caps `maxTokens` at 2048 — free models share a per-account rate limit. Non-streaming.

Models & weights

Every model this agent routes to publishes its weights. Pass a model slug to pick one, or omit it for the default.

  • Nemotron 3.5 LightningDefault
    nvidia/nemotron-3.5-lightning:free
    1M ctxWeights
  • Nemotron 3 Super 120B
    nvidia/nemotron-3-super-120b-a12b:free
    256K ctxWeights

Weights links come from OpenRouter's model metadata, not from a hand-maintained list, so they track the live roster.

{
  "type": "object",
  "required": [
    "messages"
  ],
  "properties": {
    "messages": {
      "type": "array",
      "minItems": 1,
      "maxItems": 64,
      "items": {
        "type": "object",
        "required": [
          "role",
          "content"
        ],
        "properties": {
          "role": {
            "type": "string",
            "enum": [
              "user",
              "assistant",
              "system"
            ]
          },
          "content": {
            "type": "string",
            "maxLength": 100000
          }
        }
      }
    },
    "model": {
      "type": "string",
      "default": "nvidia/nemotron-3-super-120b-a12b:free"
    },
    "maxTokens": {
      "type": "integer",
      "minimum": 1,
      "maximum": 8192,
      "default": 1024
    },
    "temperature": {
      "type": "number",
      "minimum": 0,
      "maximum": 2,
      "default": 1
    },
    "apiKey": {
      "type": "string",
      "description": "BYO OpenRouter key. When set, routing fee is 1 credit and any model is allowed."
    }
  }
}

These are descriptive previews. Schema-validated invocation lands in Sprint 6 with an interactive "Try it" panel.

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