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UnoRouter

Nemotron 3 Ultra 550B A55B API

UnoRouter
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
Temperature
Adjustable
Attachment
Not Supported
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
UnoRouter
Family
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
Documentation