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NVIDIA🇺🇸

Nemotron 3 Ultra

NVIDIA's largest Nemotron 3 model targets extended coding, scientific reasoning and multi-step tool use. Its sparse architecture activates 55 billion of 550 billion parameters, with an emphasis on retaining information across long tasks.

CONTEXT1M
MAX OUTPUT64K
LAST SCAN13 Nov 2026
🏆First observed free at Kilo, OpenRouter on .
Reasoning Open weights Text

Free aggregator routes

These are the aggregator routes recorded in the current or last published catalog. Each route keeps its exact model ID and thinking information.

Limits above: Kilo. Available gateway routes are listed below.

Preserved the established exact-model identity shared with the supplied Cline, OpenRouter and explicitly mapped OpenCode Ultra entries, supported by https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-BF16. Shared advertised identity does not establish identical serving configurations or pinned revisions.

Kilo
Info
Thinking
Supported
Model ID · Kilo APInvidia/nemotron-3-ultra-550b-a55b:free
OpenRouter
Info
Thinking
Supported
Effort levels
high · medium · none
Control
Can be toggled
Default
Enabled
Default effort
high
Token budget
Supported
Model ID · OpenRouter APInvidia/nemotron-3-ultra-550b-a55b:free
Cline
Info
Thinking
Not advertised by this API
Model ID · Cline APInvidia/nemotron-3-ultra-550b-a55b:free
NVIDIA
Info
Thinking
Not advertised by this API
Model ID · NVIDIA APInvidia/nemotron-3-ultra-550b-a55b
Context here
1M
Max output here
32K

Model sources

Use it through LiteLLM

Import the current LiteLLM-compatible YAML and use the exact model ID shown above. The catalog is generated from the same reviewed scan data as the download.

Download LiteLLM YAML

Sources & references