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NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it supports text input and output with a context window of up to 1M tokens. It is suited for long-running agentic workflows, including agent orchestration, coding agents, deep research, and complex enterprise tasks. It is particularly strong at multi-step reasoning and planning, with high-throughput inference designed for high-volume agent pipelines. It is part of the NVIDIA Nemotron family of open models for agentic AI.
from openai import OpenAI client = OpenAI( base_url="https://api.respan.ai/api/", api_key="YOUR_RESPAN_API_KEY",) response = client.chat.completions.create( model="perplexity/nemotron-3-ultra-550b-a55b", messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)from openai import OpenAI client = OpenAI( base_url="https://api.respan.ai/api/", api_key="YOUR_RESPAN_API_KEY",) response = client.chat.completions.create( model="perplexity/nemotron-3-ultra-550b-a55b", messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)Gateway routes for this model on the Respan gateway, including fallback routes when configured.
| Model | Capabilities | ||||||
|---|---|---|---|---|---|---|---|
| perplexity/nemotron-3-ultra-550b-a55b | 4K | $0.25/M | $2.50/M | Read:$0.25/MWrite:$0.00/M | — | — |
Other models from the same provider available through the gateway.
| Model | Capabilities | ||||||
|---|---|---|---|---|---|---|---|
| perplexity/anthropic/claude-fable-5 | 4K | $10.00/M | $50.00/M | Read:$1.00/MWrite:$12.50/M | — | — | |
| perplexity/anthropic/claude-fable-5-1 | 4K | $10.00/M | $50.00/M | Read:$0.25/MWrite:$12.50/M | — | — | |
| perplexity/anthropic/claude-haiku-4-5 | 4K | $1.00/M | $5.00/M | Read:$0.10/MWrite:$1.25/M | — | — | |
| perplexity/anthropic/claude-opus-4-5 | 4K | $5.00/M | $25.00/M | Read:$0.50/MWrite:$6.25/M | — | — | |
| perplexity/anthropic/claude-opus-4-6 | 4K | $5.00/M | $25.00/M | Read:$0.50/MWrite:$6.25/M | — | — | |
| perplexity/anthropic/claude-opus-4-7 | 4K | $5.00/M | $25.00/M | Read:$0.50/MWrite:$6.25/M | — | — | |
| perplexity/anthropic/claude-opus-4-8 | 4K | $5.00/M | $25.00/M | Read:$0.50/MWrite:$6.25/M | — | — | |
| perplexity/anthropic/claude-opus-5 | 4K | $5.00/M | $25.00/M | Read:$0.50/MWrite:$6.25/M | — | — | |
| perplexity/anthropic/claude-opus-5-5 | 4K | $4.00/M | $20.00/M | Read:$0.20/MWrite:$5.00/M | — | — | |
| perplexity/anthropic/claude-sonnet-4-5 | 4K | $3.00/M | $15.00/M | Read:$0.30/MWrite:$3.75/M | — | — | |
| perplexity/anthropic/claude-sonnet-4-6 | 4K | $3.00/M | $15.00/M | Read:$0.30/MWrite:$3.75/M | — | — | |
| perplexity/anthropic/claude-sonnet-5 | 4K | $2.00/M | $10.00/M | Read:$0.20/MWrite:$2.50/M | — | — |
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Use Respan with your favorite frameworks and tools.