Get The Haiku 5.5 Switch Checklist

The companion to "BREAKING: Claude Haiku 5.5 Is 90% Cheaper and 4x Faster (Tested)" (Oct 7, 2026). PAGE 1 — the price: Haiku 4.5 at $1 / $5 per million tokens vs Haiku 5.5 at $0.10 / $0.50 up to 100K-token prompts and $0.50 / $2.50 above, the new tokenizer (about 30% more tokens for the same text), thinking billed as output, and a worked example. PAGE 2 — the five things that break when you switch, with before and after code: sampling parameters, assistant prefill, thinking budgets, the answer not always being block 0, and thinking counting toward max_tokens; plus computer use, refusals and append-only conversations. PAGE 3 — which effort level for which job, the /claude-api migrate shortcut in Claude Code and what it changed on our ticket router, and a 10-item switch checklist. PAGE 4 — our test so you can rerun it: results for Haiku 4.5 vs 5.5, the ticket and routing prompts with answer keys, and the one-line routing fix. PAGE 5 — sources. Facts from Anthropic’s announcement and the platform.claude.com docs, checked October 7, 2026; benchmarks are vendor-reported. Independent guide from Hyperautomation Labs — not affiliated with Anthropic.

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