One extra input token can change the price of an entire Haiku request. The more useful question is what happens after that request: does its answer pass, require another attempt, or send the workflow to a larger model? Claude Haiku 5.5, released October 7, has a one-million-token context window and a separate pricing boundary at 100,000 prompt tokens. A large window is capacity, not a promise of the lowest cost for every workload. Anthropic model overview .
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