Claude Haiku 5.5 Guide: Tiered API Pricing, Differences from Haiku 4.5, and Migration
Anthropic released Claude Haiku 5.5 on 2026-10-07. For prompts up to 100,000 tokens it costs just $0.10/$0.50 per million tokens, one tenth of Haiku 4.5. But a request whose prompt is over 100,000 tokens is billed at $0.50/$2.50 in full, and the new tokenizer counts the same text as roughly 30% more tokens. This guide covers official specs, both price tiers, cost math that accounts for both traps, and the changes that break or alter behavior when migrating from Haiku 4.5.