--- title: NVIDIA: Nemotron 3 Ultra (free) | Text Generation | ModelsLab description: Build with NVIDIA: Nemotron 3 Ultra (free) API by Nvidia. Text generation, chat, code, and reasoning. Pay-per-use. Free tier. url: https://modelslab.com/models/nvidia/nvidia-nemotron-3-ultra-550b-a55b-free.md canonical: https://modelslab.com/models/nvidia/nvidia-nemotron-3-ultra-550b-a55b-free.md type: product component: Playground/LLM/Index generated_at: 2026-06-04T23:32:06.740376Z --- NVIDIA: Nemotron 3 Ultra (free) --- [LLMs.txt](https://modelslab.com/models/open_router/nvidia-nemotron-3-ultra-550b-a55b-free/llms.txt) [.md](https://modelslab.com/models/nvidia/nvidia-nemotron-3-ultra-550b-a55b-free.md) NVIDIA: Nemotron 3 Ultra (free) --- Choose a prompt below to get started or type your own message Explain quantum computing in simple terms Write a Python function to sort a list Create a marketing email for a SaaS product Compare REST vs GraphQL APIs Send ### NVIDIA: Nemotron 3 Ultra (free) nvidia nvidia-nemotron-3-ultra-550b-a55b-free Copy model ID PricingInput $0.00 / 1M tokens Output $0.00 / 1M tokens API EndpointsOpenAI Compatible `https://modelslab.com/api/v7/llm/chat/completions`Endpoint Anthropic Compatible `https://modelslab.com/api/v7/llm/v1/messages`Messages `https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens `https://modelslab.com/api/v7/llm/v1/models`Models Use with Claude Code cURL Example ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses. Temperature0.7 Max Tokens1000 Top P0.9 Frequency Penalty0 Presence Penalty0 Model Info Support Related Models --- Discover similar models you might be interested in [View all LLM Models](https://modelslab.com/models?feature=llmaster) [#### open\_router/OpenAI: GPT-4o (2024-05-13) openai-gpt-4o-2024-05-13 From $10.00/M tokens](https://modelslab.com/models/open_router/openai-gpt-4o-2024-05-13) [#### open\_router/Tencent: Hy3 preview tencent-hy3-preview From $0.14/M tokens](https://modelslab.com/models/open_router/tencent-hy3-preview) [#### open\_router/Morph: Morph V3 Large morph-morph-v3-large From $1.40/M tokens](https://modelslab.com/models/open_router/morph-morph-v3-large) [#### together\_ai/Qwen3 235B A22B Instruct 2507 FP8 Throughput Qwen-Qwen3-235B-A22B-Instruct-2507-tput From $0.40/M tokens](https://modelslab.com/models/together_ai/Qwen-Qwen3-235B-A22B-Instruct-2507-tput) [#### open\_router/MiniMax: MiniMax M2.5 minimax-minimax-m2.5 From $0.65/M tokens](https://modelslab.com/models/open_router/minimax-minimax-m2.5) [#### google/Gemini 2.5 Flash gemini-2.5-flash From $1.40/M tokens](https://modelslab.com/models/google/gemini-2.5-flash) [#### open\_router/Google: Gemma 4 31B google-gemma-4-31b-it From $0.24/M tokens](https://modelslab.com/models/open_router/google-gemma-4-31b-it) [#### open\_router/Qwen: Qwen3.5-27B qwen-qwen3.5-27b From $0.88/M tokens](https://modelslab.com/models/open_router/qwen-qwen3.5-27b) [#### open\_router/Google: Gemini 3.5 Flash google-gemini-3.5-flash From $5.25/M tokens](https://modelslab.com/models/open_router/google-gemini-3.5-flash) [#### open\_router/Mistral: Voxtral Small 24B 2507 mistralai-voxtral-small-24b-2507 From $0.20/M tokens](https://modelslab.com/models/open_router/mistralai-voxtral-small-24b-2507) [#### open\_router/Mistral: Mistral Nemo mistralai-mistral-nemo From $0.03/M tokens](https://modelslab.com/models/open_router/mistralai-mistral-nemo) [#### open\_router/Amazon: Nova Lite 1.0 amazon-nova-lite-v1 From $0.15/M tokens](https://modelslab.com/models/open_router/amazon-nova-lite-v1) [#### open\_router/Mistral: Mistral Medium 3.5 mistralai-mistral-medium-3-5 From $4.50/M tokens](https://modelslab.com/models/open_router/mistralai-mistral-medium-3-5) [#### arcee\_ai/Arcee AI Spotlight arcee\_ai-arcee-spotlight From $0.22/M tokens](https://modelslab.com/models/arcee_ai/arcee_ai-arcee-spotlight) [#### open\_router/Switchpoint Router switchpoint-router From $2.13/M tokens](https://modelslab.com/models/open_router/switchpoint-router) [#### open\_router/Meta: Llama 3.2 11B Vision Instruct meta-llama-llama-3.2-11b-vision-instruct From $0.24/M tokens](https://modelslab.com/models/open_router/meta-llama-llama-3.2-11b-vision-instruct) [#### meta/Meta Llama 3.2 11B Vision Instruct Turbo meta-llama-Llama-3.2-11B-Vision-Instruct-Turbo From $0.05/M tokens](https://modelslab.com/models/meta/meta-llama-Llama-3.2-11B-Vision-Instruct-Turbo) [#### open\_router/DeepSeek: DeepSeek V3.1 Terminus deepseek-deepseek-v3.1-terminus From $0.61/M tokens](https://modelslab.com/models/open_router/deepseek-deepseek-v3.1-terminus) Open Source Alternatives --- Explore open-source models that offer similar capabilities with full transparency and flexibility [View all open source models](https://modelslab.com/models?feature=llm&provider=open-source-models) [MU](https://modelslab.com/models/modelslab/uncensored-chat)[ModelsLab](https://modelslab.com/models/modelslab) [Modelslab: Uncensored Chat Open Source Model](https://modelslab.com/models/modelslab/uncensored-chat) About NVIDIA: Nemotron 3 Ultra (Free) --- NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it... ### Technical Specifications Model IDnvidia-nemotron-3-ultra-550b-a55b-free CategoryLLM Models TaskText Generation AddedJune 4, 2026 ### Key Features - Chat completion and multi-turn conversation API - Streaming response with token-by-token output - Function calling and tool use support - System prompts and role-based messaging - JSON mode and structured output ### Quick Start Integrate NVIDIA: Nemotron 3 Ultra (Free) into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started. PythonJavaScriptcURLPHP ``` import requests import json url = "https://modelslab.com/api/v7/llm/chat/completions" headers = { "Content-Type": "application/json" } data = { "model_id": "nvidia-nemotron-3-ultra-550b-a55b-free", "messages": [ { "role": "user", "content": "Hello!" } ], "max_tokens": 1000, "key": "YOUR_API_KEY" } try: response = requests.post(url, headers=headers, json=data) response.raise_for_status() # Raises an HTTPError for bad responses (4XX or 5XX) result = response.json() print("API Response:") print(json.dumps(result, indent=2)) except requests.exceptions.HTTPError as http_err: print(f"HTTP error occurred: {http_err} - {response.text}") except Exception as err: print(f"Other error occurred: {err}") ``` ### Use Cases - AI chatbots and virtual assistants - Code generation and developer tools - Content writing and copywriting automation - Data analysis, summarization, and extraction [Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Nvidia](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing) NVIDIA: Nemotron 3 Ultra (Free) FAQ --- ### What is NVIDIA: Nemotron 3 Ultra (Free)? NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it... ### How do I use the NVIDIA: Nemotron 3 Ultra (Free) API? You can integrate NVIDIA: Nemotron 3 Ultra (Free) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "nvidia-nemotron-3-ultra-550b-a55b-free" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### What is the NVIDIA: Nemotron 3 Ultra (Free) model ID? The model ID for NVIDIA: Nemotron 3 Ultra (Free) is "nvidia-nemotron-3-ultra-550b-a55b-free". Use this ID in your API requests to specify this model. ### Does NVIDIA: Nemotron 3 Ultra (Free) have a free tier? Yes, ModelsLab offers a free tier that lets you try NVIDIA: Nemotron 3 Ultra (Free) and other AI models. Sign up to get free API credits and start building immediately. --- *This markdown version is optimized for AI agents and LLMs.* **Links:** - [Website](https://modelslab.com) - [API Documentation](https://docs.modelslab.com) - [Blog](https://modelslab.com/blog) --- *Generated by ModelsLab - 2026-06-05*