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OpenRouter

Nemotron 3 Ultra 550B A55B API

OpenRouter
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 cost-effective pricing at $0.50/1M input and $2.20/1M output tokens, native tool calling support, open weights architecture. Access Nemotron 3 Ultra 550B A55B via the OpenRouter API with up to 16K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
262K

Tokens

Input Limit
262K

Tokens

Max Output
16K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.50
Output
$2.20

Caching (per 1M tokens)

Read
$0.10
Frequently Asked Questions

Nemotron 3 Ultra 550B A55B by OpenRouter costs $0.50 per 1M input tokens and $2.20 per 1M output tokens. Cached reads cost $0.10 per 1M tokens.

Model Details
ID
nvidia/nemotron-3-ultra-550b-a55b
Provider
OpenRouter
Family
nemotron
Release Date
Jun 4, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1
Documentation