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Building Multi-Model Apps

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Why Use Multiple Models?

The right tool for each job

No single AI is best at everything.

**When to use Claude:** - Complex reasoning and analysis - Long document processing (200K context!) - Tasks requiring careful instruction following - Safety-critical applications

**When to use GPT:** - Creative writing and brainstorming - Function calling and tool use - When you need JSON mode - Image generation (DALL-E)

**When to use Gemini:** - Image/video analysis - When budget matters (free tier!) - Google ecosystem integration - Fast, simple tasks (Flash model)

**Real-world pattern:** ``` User uploads photo → Gemini analyzes image (cheap, multimodal) → Claude processes analysis (reasoning) → GPT generates creative response (creative) ```

This is how production apps work!