Claude Haiku 5.5 vs Haiku 4.5: Novedades y cambios incompatibles prioritarios a solucionar

Launched on October 7, 2026, Claude Haiku 5.5 reduces costs by 90% for prompts up to 100K tokens, pricing at $0.10/$0.50 per million input/output tokens. It expands the context window from 200K to 1M tokens and achieves higher benchmark scores than Haiku 4.5. However, five request formats from version 4.5 now trigger 400 errors, and other silent changes affect responses and costs. Apidog provides tools to manage these breaking changes and migration testing.