Act on this, mostly signal

Claude Haiku 5.5 launches at $0.10 input per million tokens

What to do

Recheck your Haiku budget, since the tokenizer runs about 1.25x heavier than Haiku 4.5.

Why

Pricing rises to $0.50 and $2.50 beyond 100k tokens, and reasoning cannot be disabled.

What the research found

Simon Willison's Oct 7 2026 post says Claude Haiku 5.5 costs $0.10/$0.50 per million tokens up to 100k tokens, uses a tokenizer about 1.25x heavier than Haiku 4.5, and cannot disable reasoning.

Claims and how well the evidence supports them

Claude Haiku 5.5 is priced at $0.10/$0.50 per million tokens up to 100k tokens, rising to $0.50/$2.50 beyond 83%
Claude Haiku 5.5 uses a tokenizer about 1.25x heavier than Haiku 4.5 96%
Claude Haiku 5.5 cannot disable reasoning 98%
Anthropic is halving the price of Sonnet 5.5 cache reads 98%

Evidence

simonwillison.net https://simonwillison.net/2026/Oct/7/claude-haiku-5-5

Actionability rated high.