Here is the guide for using Fireworks models in 16x Prompt:
- Go to Fireworks
 - Top up your account to be able to use the API
 - Go to API Keys page
 - Create a new API key and copy it
 - Open 16x Prompt and click on the API model settings button in the bottom right corner
 - Go to "3rd Party API / Ollama Configuration" tab
 
- Paste the API key into the "API Key" field
 - Enter 
https://api.fireworks.ai/inference/v1into the "API Endpoint / Base URL" field - Enter model ID, for example 
accounts/fireworks/models/deepseek-r1oraccounts/fireworks/models/deepseek-v3into the "Model ID" field. 
Refer to Fireworks Models for more information.
- Click on "Close"