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Chatting with AI Models

Select from premium AI models and start chatting instantly.

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Selecting a Model

Available models in the tabs:
  • GPT-5.2 - OpenAI’s best model ($0.020/1K tokens)
  • GPT-3.5 Turbo - Fast, general-purpose ($0.002/1K tokens)
  • GPT-4 Turbo - Complex reasoning ($0.040/1K tokens)
  • Claude 4.5 Sonnet - Analysis, long-form ($0.018/1K tokens)
  • Gemini 2.5 Flash - Cost-effective ($0.003/1K tokens)
  • Grok - xAI’s latest ($0.001/1K tokens)
  • DeepSeek Chat - Code generation ($0.001/1K tokens)
  • Synth - Query all models at once (combined pricing)

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Sending Messages

  1. Type your message in the input box
  2. Press Send or hit Enter
  3. See the AI’s response with cost breakdown
  4. Continue the conversation

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Cost Tracking

Each response shows:
  • Token count (input/output)
  • Total cost in USD
  • Model used
Your total balance is displayed in the header.

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Special Features

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Synthesizer Mode

The Synth tab queries multiple AI models simultaneously and synthesizes their responses into one comprehensive answer. How it works:
  1. Your question is sent to multiple models (GPT-4, Claude, Gemini, etc.)
  2. All responses are combined and synthesized
  3. You get the best combined answer from all models
Best for:
  • Complex questions that benefit from multiple perspectives
  • Research and analysis tasks
  • Getting more comprehensive answers

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LaTeX / Math Rendering

Chat402 supports LaTeX math notation. AI responses containing mathematical formulas are automatically rendered. Supported formats:
  • Inline math: $E = mc^2$ renders as inline formula
  • Display math: $$\int_0^\infty e^{-x^2} dx = \frac{\sqrt{\pi}}{2}$$ renders as block formula
  • Alternative: \(inline\) and \[display\] also work
Use cases:
  • Ask for mathematical explanations
  • Get step-by-step equation solutions
  • Physics and engineering calculations
  • Statistics and probability formulas

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Markdown Support

Responses are rendered with full Markdown support:
  • Bold and italic text
  • Code blocks with syntax highlighting
  • Tables
  • Lists and numbered items
  • Links and images

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Image Uploads

For vision-capable models (GPT-4 Vision):
  1. Click the image upload button
  2. Select an image file
  3. Ask questions about the image
  4. Get detailed visual analysis