Report
Haiku 5.5 (max) reportedly beats Sonnet 5 by 13 points on BuildingBench
EnactraAI reports a cost of $1.34 per building for Haiku 5.5 (max), versus $15.03 for Sonnet 5.
TLDR
EnactraAI says Haiku 5.5 (max) scored 67.1 on BuildingBench, up from its predecessor’s 26.7, and beat Sonnet 5 by 13 points at $1.34 versus $15.03 per building. It puts Mistral Large 4 (max) at 52.0 using the Claude Code harness, at $33.21 per building. EnactraAI says Haiku narrowly missed the Pareto frontier because SWE-2 scored almost identically and was still free during its promotion.
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