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Claude Sonnet 5.5 and Haiku 5.5 in Python: Two SDKs, Prompt Caching and Haiku's 100K Pricing Cliff

This story is from 2026-10-17. It is preserved in the archive; the latest stories are on the live feed.

Short answer: call claude-haiku-5-5 for classification, extraction, routing and summaries, and claude-sonnet-5-5 for multi-step coding and long tool loops. Both work through the Anthropic SDK and, via a gateway, the OpenAI SDK. Keep each Haiku 5.5 prompt at or under 100,000 tokens, because above th…

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  1. 2026-10-17 15:24 · DEV Community — AI
    Claude Sonnet 5.5 and Haiku 5.5 in Python: Two SDKs, Prompt Caching and Haiku's 100K Pricing Cliff

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