"Cost per task" is such a terrible metric/benchmark if your use case is non-automated coding tasks. What a lower cost-per-task metric for an LLM means in practice, for coding, means writing unintelligible code, which while technically "correct" is barely readable slop to humans
At its default effort setting, Opus 5.5 delivers frontier results for a fraction of the cost per task, often beating other models running at their highest settings.
It also generates output more than 30% faster than Opus 5.