NVIDIA: Nemotron 3 Ultra (free) API
About
Build advanced reasoning agents with NVIDIA: Nemotron 3 Ultra (free), 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 NVIDIA: Nemotron 3 Ultra (free) via the Kilo Gateway API with up to 66K 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
66K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Frequently Asked Questions
NVIDIA: Nemotron 3 Ultra (free) by Kilo Gateway costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
nvidia/nemotron-3-ultra-550b-a55b:free
Provider
Kilo GatewayFamily
nemotron
Release Date
Jun 4, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
KILO_API_KEY
API Base URL
https://api.kilo.ai/api/gateway