Moving from Claude Haiku 4.5 to 5.5: what changed on the same 100 prompts

Automated excerpt

For reference, Haiku 4. 5 runs at temperature 0, while Haiku 5. 5 runs with its defaults, since it won't accept anything else. At temperature 0, Haiku 4. 5 gave identical answers on both calls for 95 to 100 of the 100 prompts every day. Not occasionally, either: every time, every day.

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