Nemotron 3.5 Lightning (free) API
About
Build advanced reasoning agents with Nemotron 3.5 Lightning (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 Nemotron 3.5 Lightning (free) via the OpenRouter 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
Nemotron 3.5 Lightning (free) by OpenRouter costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
ID
nvidia/nemotron-3.5-lightning:free
Provider
OpenRouterFamily
nemotron
Release Date
Aug 11, 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