Claude Haiku 5.5's 100K line: one extra token can make the whole request 5x

Automated excerpt

Claude Haiku 5.5 is cheap at $0.10 input and $0.50 output per 1M tokens, and it has a 1M-token context window. The price sheet also has a step at 100K prompt tokens, and it applies to the whole request. The Batch API is half price. 99K prompt: 9.9K x $0.10 + 89.1K x $0.01 + 4K x $0.50 = about $0.0039 101K prompt: 10.1K x $0.50 + 90.9K x $0.05 + 4K x $2.50 = about $0.0196 2% more prompt, about 5x the cost of the turn.

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