--- title: NVIDIA: Nemotron 3 Ultra API | Text Generation | ModelsLab description: Build with NVIDIA: Nemotron 3 Ultra 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.md canonical: https://modelslab.com/models/nvidia/nvidia-nemotron-3-ultra-550b-a55b.md type: product component: Playground/LLM/Index generated_at: 2026-06-04T23:31:33.710947Z --- NVIDIA: Nemotron 3 Ultra --- [LLMs.txt](https://modelslab.com/models/open_router/nvidia-nemotron-3-ultra-550b-a55b/llms.txt) [.md](https://modelslab.com/models/nvidia/nvidia-nemotron-3-ultra-550b-a55b.md) NVIDIA: Nemotron 3 Ultra --- 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 nvidia nvidia-nemotron-3-ultra-550b-a55b Copy model ID PricingInput $0.50 / 1M tokens Output $2.50 / 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/Mistral: Ministral 3 8B 2512 mistralai-ministral-8b-2512 From $0.15/M tokens](https://modelslab.com/models/open_router/mistralai-ministral-8b-2512) [#### google/Gemini 2.0 Flash gemini-2.0-flash-001 From $0.25/M tokens](https://modelslab.com/models/google/gemini-2.0-flash-001) [#### open\_router/Anthropic: Claude Opus 4 anthropic-claude-opus-4 From $45.00/M tokens](https://modelslab.com/models/open_router/anthropic-claude-opus-4) [#### open\_router/Qwen: Qwen3.6 35B A3B qwen-qwen3.6-35b-a3b From $0.57/M tokens](https://modelslab.com/models/open_router/qwen-qwen3.6-35b-a3b) [#### open\_router/Meta: Llama 4 Maverick meta-llama-llama-4-maverick From $0.38/M tokens](https://modelslab.com/models/open_router/meta-llama-llama-4-maverick) [#### open\_router/Google: Gemini 2.5 Flash Lite google-gemini-2.5-flash-lite From $0.25/M tokens](https://modelslab.com/models/open_router/google-gemini-2.5-flash-lite) [#### openai/GPT-5.1-Codex-Max gpt-5.1-codex-max From $5.63/M tokens](https://modelslab.com/models/openai/gpt-5.1-codex-max) [#### open\_router/Poolside: Laguna XS.2 (free) poolside-laguna-xs.2-free Free](https://modelslab.com/models/open_router/poolside-laguna-xs.2-free) [#### open\_router/Cohere: Command R+ (08-2024) cohere-command-r-plus-08-2024 From $6.25/M tokens](https://modelslab.com/models/open_router/cohere-command-r-plus-08-2024) [#### open\_router/Arcee AI: Trinity Mini arcee-ai-trinity-mini From $0.10/M tokens](https://modelslab.com/models/open_router/arcee-ai-trinity-mini) [#### mistral\_ai/Mistral Small (24B) Instruct 25.01 mistralai-Mistral-Small-24B-Instruct-2501 From $0.20/M tokens](https://modelslab.com/models/mistral_ai/mistralai-Mistral-Small-24B-Instruct-2501) [#### open\_router/Cohere: Command A cohere-command-a From $6.25/M tokens](https://modelslab.com/models/open_router/cohere-command-a) [#### open\_router/MiniMax: MiniMax M2.7 minimax-minimax-m2.7 From $0.74/M tokens](https://modelslab.com/models/open_router/minimax-minimax-m2.7) [#### open\_router/EssentialAI: Rnj 1 Instruct essentialai-rnj-1-instruct From $0.15/M tokens](https://modelslab.com/models/open_router/essentialai-rnj-1-instruct) [#### perplexity\_ai/R1 1776 perplexity-ai-r1-1776 From $8.40/M tokens](https://modelslab.com/models/perplexity_ai/perplexity-ai-r1-1776) [#### open\_router/OpenAI: GPT-4o-mini openai-gpt-4o-mini From $0.38/M tokens](https://modelslab.com/models/open_router/openai-gpt-4o-mini) [#### open\_router/Relace: Relace Search relace-relace-search From $2.00/M tokens](https://modelslab.com/models/open_router/relace-relace-search) [#### qwen/Qwen2.5-VL (72B) Instruct Qwen-Qwen2.5-VL-72B-Instruct From $4.97/M tokens](https://modelslab.com/models/qwen/Qwen-Qwen2.5-VL-72B-Instruct) 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 --- 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 CategoryLLM Models TaskText Generation Price$1.5 per million tokens 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 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", "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}") ``` ### Pricing NVIDIA: Nemotron 3 Ultra API costs $1.500000 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing) ### 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 FAQ --- ### What is NVIDIA: Nemotron 3 Ultra? 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 API? You can integrate NVIDIA: Nemotron 3 Ultra 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" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation. ### How much does NVIDIA: Nemotron 3 Ultra cost? NVIDIA: Nemotron 3 Ultra costs $1.500000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started. ### What is the NVIDIA: Nemotron 3 Ultra model ID? The model ID for NVIDIA: Nemotron 3 Ultra is "nvidia-nemotron-3-ultra-550b-a55b". Use this ID in your API requests to specify this model. ### Does NVIDIA: Nemotron 3 Ultra have a free tier? Yes, ModelsLab offers a free tier that lets you try NVIDIA: Nemotron 3 Ultra 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*