Claude Haiku 4.5 Complete Guide 2026
What - Anthropic's fastest model - $0.80/$4 per M tokens - Sub-second latency - 200K context Use Cases - Classification - Extraction - Simple chatbot - Real-time apps - Mobile vs Sonnet - 4x cheaper - Faster - Less capable When Haiku Wins - Volume work - Low-latency required - Simple tasks - Cost-sensitive When to Upgrade - Complex reasoning needed - Multi-step tasks - Subtle nuance Common Mistak…