Ann NgAnn Ng
5 min read

How to use Nemotron 3 Ultra 550B A55B from Fireworks AI with API Key on TypingMind

Learn how to access and use Nemotron 3 Ultra 550B A55B with your Fireworks AI API key through TypingMind. Get started with this powerful AI model in minutes.

Fireworks.ai is a high-performance generative AI platform that provides the fastest inference for open-source LLMs and multimodal models through a developer-friendly API.

The platform features a proprietary FireAttention engine delivering 50% faster speed and 250% higher throughput than standard engines, with support for popular models like LLaMA, Mixtral, DeepSeek, and Falcon. Key capabilities include serverless inference, advanced fine-tuning (LoRA, RLHF), function calling, batch processing, on-demand GPU access (NVIDIA H100/H200, AMD MI300X), and OpenAI-compatible APIs.

Official Documentation: https://fireworks.ai/docs/

Nemotron 3 Ultra 550B A55B Overview

Model NameNemotron 3 Ultra 550B A55B
ProviderFireworks AI
Model IDaccounts/fireworks/models/nemotron-3-ultra-nvfp4
Release DateJun 4, 2026
Last UpdatedJun 4, 2026
Context Window262,144 tokens
Max Output128,000 tokens
Pricing /1M tokens$0.6 input
$2.4 output
$0.119 cache read
Input Modalitiestext
Output Modalitiestext
Capabilities
ReasoningTool CallingTemperature ControlOpen Weights

Complete Setup Guide

1

Get Your Fireworks AI API Key

First, you'll need to obtain an API key from Fireworks AI. This key allows you to access their AI models directly and pay only for what you use.

  1. Visit Fireworks AI's API console
  2. Sign up or log in to your account
  3. Navigate to the API keys section
  4. Generate a new API key (copy it immediately as some providers only show it once)
  5. Save your API key in a secure password manager or encrypted note

⚠️ Important: Keep your API key secure and never share it publicly. Store it safely as you'll need it to connect with TypingMind.

2

Configure TypingMind with Fireworks AI API Key

  1. Open TypingMind in your browser
  2. Click the "Settings" icon (gear symbol)
  3. Navigate to "Models" section
  4. Click "Add Custom Model"
  5. Fill in the model information:
    Name: accounts/fireworks/models/nemotron-3-ultra-nvfp4 via Fireworks AI (or your preferred name)
    Endpoint: https://api.fireworks.ai/inference/v1/chat/completions
    Model ID: accounts/fireworks/models/nemotron-3-ultra-nvfp4
    Context Length: Enter the model's context window (e.g., 262144 for accounts/fireworks/models/nemotron-3-ultra-nvfp4)
    Fireworks AI Endpoint URL input fieldaccounts/fireworks/models/nemotron-3-ultra-nvfp4https://api.fireworks.ai/inference/v1/chat/completionsaccounts/fireworks/models/nemotron-3-ultra-nvfp4 via Fireworks AIhttps://www.typingmind.com/model-logo.webp262144
  6. Add custom headers by clicking "Add Custom Headers" in the Advanced Settings section:
    Authorization: Bearer <API_KEY>:
    X-Title: typingmind.com
    HTTP-Referer: https://www.typingmind.com
  7. Enable "Support Plugins (via OpenAI Functions)" if the model supports the "functions" or "tool_calls" parameter, or enable "Support OpenAI Vision" if the model supports vision.
  8. Click "Test" to verify the configuration
  9. If you see "Nice, the endpoint is working!", click "Add Model"
3

Start chatting with Nemotron 3 Ultra 550B A55B

Now you can start chatting with Nemotron 3 Ultra 550B A55B through TypingMind:

  • Select Nemotron 3 Ultra 550B A55B from the model dropdown menu
  • Start typing your message in the chat input
  • Enjoy faster responses and better features than the official interface
  • Switch between different AI models as needed
The best frontend AI chat for accounts/fireworks/models/nemotron-3-ultra-nvfp4 via OpenRouter API KeyThe best frontend AI chat for accounts/fireworks/models/nemotron-3-ultra-nvfp4 via OpenRouter API Keyaccounts/fireworks/models/nemotron-3-ultra-nvfp4The best frontend AI chat for accounts/fireworks/models/nemotron-3-ultra-nvfp4 via OpenRouter API Key

💡 Pro tips for better results:

Frequently Asked Questions

Do I need a subscription to use Nemotron 3 Ultra 550B A55B?

No! With Fireworks AI API, you pay only for what you use with no monthly subscription. Add credits to your Fireworks AI account and pay as you go. TypingMind is also a one-time purchase, not a subscription.

How much will it cost to use Nemotron 3 Ultra 550B A55B?

Nemotron 3 Ultra 550B A55B costs $0.6/1M input tokens and $2.4/1M output tokens. A typical conversation might cost $0.01-0.10 depending on length.

Can I use other models besides Nemotron 3 Ultra 550B A55B?

Yes! With Fireworks AI API + TypingMind, you can access all Fireworks AI models. Switch between them instantly in TypingMind.

Is my data private and secure?

Yes! TypingMind stores conversations locally (web version in browser, desktop version on your device). Fireworks AI handles API calls securely. Check Fireworks AI's data policy for specifics.

Can I use Nemotron 3 Ultra 550B A55B for commercial projects?

Yes! Check Fireworks AI's terms of service for specific commercial use policies. TypingMind supports commercial use.