Choosing Models

Billix gives you access to 40+ AI models from different providers. Each model has unique strengths, so choosing the right one can significantly improve your results.

Quick Model Selector

Click the model dropdown near the input area to see all available models. You can switch models at any time, even in the middle of a conversation.

Model Categories

General Purpose (Everyday Tasks)

Best for: Writing, answering questions, brainstorming, general help

Premium (Complex Tasks)

Best for: Deep analysis, complex reasoning, important work

Coding & Technical

Best for: Writing code, debugging, technical explanations

Creative & Writing

Best for: Stories, marketing copy, creative content

Fast & Efficient

Best for: Quick answers, simple tasks, when speed matters

How to Choose

Ask Yourself

1. How complex is my task?

   • Simple question → Use a fast model (GPT-4o Mini, Gemini Flash)
   • Complex analysis → Use a premium model (GPT-5, Claude Opus)

2. What type of content?

   • Code → GPT-4.1, Claude Sonnet, or Qwen Coder
   • Writing → Claude Opus or GPT-4o
   • Research → Gemini Pro with web search

3. How important is speed?

   • Need it fast → GPT-4o Mini, Gemini Flash
   • Quality matters more → Premium models

4. Do I need to see reasoning?

   • Yes → Use reasoning models (o3, DeepSeek R1)
   • No → Standard models are fine

Model Switching

You can switch models anytime during a conversation:

Reasoning Models

Some models can show you their "thinking process":

• o3 (OpenAI) - Step-by-step reasoning
• Claude 4 Opus (Anthropic) - Detailed thought process
• DeepSeek R1 - Open reasoning model
• Gemini 2.5 Flash Thinking - Reasoning with speed

With reasoning models, you'll see the AI's thought process before the final answer. This is useful for:

• Understanding complex decisions
• Learning how the AI approaches problems
• Verifying the AI's logic

Credits and Pricing

Different models cost different amounts of credits:

See How Credits Work for details.

Managing Your Models

Favorite Models

Star models you use often:

1. Open the model selector
2. Click the star icon next to a model
3. Starred models appear at the top

Disable Models

Hide models you never use:

1. Go to Settings → Models
2. Toggle off models you want to hide
3. They won't appear in your model selector

Set Default Model

Choose which model new chats use:

1. Go to Settings → Models
2. Set your preferred default model
3. All new chats will start with this model

Common Questions

Next Steps

• Learn about attachments to include files in your chats
• Explore the full AI Models guide for detailed model information
• See credit usage to understand costs