Faster models typically cost more. But "faster is better" isn't always true—the right choice depends on your application.
When Speed Matters
Real-Time User Interfaces
Chat interfaces, autocomplete, and interactive tools need fast responses. Users perceive delays over 300ms as sluggish. For these cases, invest in low-latency models.
High-Volume Streaming
When you're showing tokens as they generate, throughput (tokens per second) determines how fluid the experience feels. Aim for 50+ tokens/second for smooth streaming.
Time-Sensitive Workflows
If your pipeline has humans waiting—like AI-assisted customer support—delays compound. Fast models keep humans productive.
When Cost Matters More
Batch Processing
Processing 10,000 documents overnight? Nobody's watching. Use the cheapest model that meets quality requirements. A 10x cheaper model saves significant money at scale.
Background Tasks
Email categorization, content moderation, data extraction—if users don't see it happening, optimize for cost.
Development and Testing
You'll run thousands of test queries while building. Use cheap models for development, expensive ones for production.
Sort by what matters to you
Filter models by throughput for speed or by price for cost efficiency.
Compare ModelsThe Hybrid Approach
Smart systems use multiple models:
- Router pattern: Classify incoming requests, route simple ones to cheap models, complex ones to capable models.
- Cascade pattern: Try the cheap model first. If confidence is low, escalate to the expensive one.
- Task-specific: Different endpoints for different tasks, each using an appropriate model.
These patterns can reduce costs 50-80% while maintaining quality where it matters.