NVIDIA: Nemotron 3.5 Lightning (free)

Best for

Best for high-throughput agentic workloads; weak at general-purpose conversational tasks.

Pricing

Free via OpenRouter (subject to OpenRouter's rate limits)

How to access it

Available via OpenRouter: create a free account at openrouter.ai, generate an API key, then call this model as nvidia/nemotron-3.5-lightning:free through the OpenRouter API (or any OpenRouter-compatible app/client).