Nemotron 3 Ultra
A 550B parameter (55B active) open reasoning model from NVIDIA, built for long-running agent workflows. It uses a hybrid Mamba-Transformer MoE architecture and supports a 1M token context window.
ReasoningTool UseImplicit Caching
index.ts
import { streamText } from 'ai'
const result = streamText({ model: 'nvidia/nemotron-3-ultra-550b-a55b', prompt: 'Why is the sky blue?'})Providers
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
| Provider |
|---|
 Together AI | 1M | 0.2s | 214tps | $0.60/M | $3.60/M | Read:$0.2/M Write:— | — | — | +1 | 06/04/2026 | ||
 DeepInfra | 262K | 0.5s | 263tps | $0.50/M | $2.50/M | Read:$0.15/M Write:— | — | — | +1 | 06/04/2026 | ||
 Blackbox | 1M | $0.37/M | $1.08/M | Read:$0.14/M Write:— | — | — | +1 | 06/04/2026 | ||||
 Baseten | 1M | 0.2s | $0.60/M | $2.40/M | Read:$0.12/M Write:— | — | — | +1 | 06/04/2026 |