Nemotron 3 Ultra 550B A55B API
About
Build advanced reasoning agents with Nemotron 3 Ultra 550B A55B, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support, open weights architecture. Access Nemotron 3 Ultra 550B A55B via the UnoRouter API with up to 128K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
128K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
Nemotron 3 Ultra 550B A55B by UnoRouter costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
nemotron-3-ultra-550b-a55b:free
Provider
UnoRouterFamily
nemotron
Release Date
Jun 4, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
UNOROUTER_API_KEY
API Base URL
https://api.unorouter.com/v1