nemotron-3-5-lightning-free
Nemotron 3.5 Lightning (free) is an open mixture-of-experts model from NVIDIA with 3B active out of 30B total parameters, suited for high-throughput agentic workloads. This is the free tier served through OpenRouter: requests are rate-limited, the free version may be withdrawn at any time, and free providers may log prompts — use the paid version for production.
Pricing: Input 0 credits / 1M tokens (≈ $0.00), Output 0 credits / 1M tokens (≈ $0.00).
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This demo page does not include the full memory features of the client. For the complete experience, please use the client or the CLI.
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Nemotron 3.5 Lightning (free) is an open mixture-of-experts model from NVIDIA with 3B active out of 30B total parameters, suited for high-throughput agentic workloads. This is the free tier served through OpenRouter: requests are rate-limited, the free version may be withdrawn at any time, and free providers may log prompts — use the paid version for production.
Nemotron 3.5 Lightning (free) at a glance
Nemotron 3.5 Lightning (free) is a chat model from NVIDIA. It accepts text as input and returns text, with a context window of up to 1M tokens.
Use it without hosting anything
The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Nemotron 3.5 Lightning (free)
Up to 1M tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Function calling
Nemotron 3.5 Lightning (free) supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Reasoning mode
Nemotron 3.5 Lightning (free) can produce reasoning before its final answer; in the Playground you can switch reasoning on or off to compare results.
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Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Nemotron 3.5 Lightning (free) responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
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Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "nemotron-3-5-lightning-free" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
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Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
Low-latency experiences
Power chat interfaces, autocomplete and interactive tools where users expect fast responses.
Autonomous agents
Build agents that plan multi-step tasks, call your tools and APIs, and keep working toward a goal across long sessions.
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
Frequently Asked Questions
What is Nemotron 3.5 Lightning (free)?⌄
Nemotron 3.5 Lightning (free) is an open mixture-of-experts model from NVIDIA with 3B active out of 30B total parameters, suited for high-throughput agentic workloads. This is the free tier served through OpenRouter: requests are rate-limited, the free version may be withdrawn at any time, and free providers may log prompts — use the paid version for production.
Which inputs does Nemotron 3.5 Lightning (free) support?⌄
Nemotron 3.5 Lightning (free) accepts text and returns text. Through ModelFold you send text messages; documents attached in the Playground are converted to text.
How long is the context window of Nemotron 3.5 Lightning (free)?⌄
Up to 1M tokens, shared between your input and the model’s output.
Does Nemotron 3.5 Lightning (free) support function calling?⌄
Yes. Nemotron 3.5 Lightning (free) supports tools / function calling through the standard tools parameter of the chat completions API.
How is Nemotron 3.5 Lightning (free) billed on ModelFold?⌄
This is the free version served through OpenRouter: calls are not charged, but they are rate-limited and the free version may be withdrawn at any time. Use the paid version of the model for production traffic.
| Input | 0 credits 1M tokens≈ $0.00 |
| Output | 0 credits 1M tokens≈ $0.00 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"nemotron-3-5-lightning-free","messages":[{"role":"user","content":"Hello"}]}'