Sonnet 5.5 did this. Opus 5.5 quality with half price.

A 30-second, 1080p, 60 fps video featuring Snoo, kinetic type, a subreddit marquee, and various Reddit-themed animations was created using Sonnet 5.5. The project involved 14 sub-agents and consumed 739k tokens, 101.6M cache reads, and 3.07M cache writes, costing $35.40 with Sonnet 5.5. This was approximately 43% cheaper than if Opus 5.5 had been used for the same tokens, primarily because cache reads, which constitute most of the token usage, cost the same for both models.

This report uniquely details the cost breakdown, showing Sonnet 5.5 achieved Opus 5.5-level quality for 43% less due to cache read pricing, unlike general performance claims.