Claude Sonnet 5 called a useless flop by fans despite near-Opus benchmarks
Anthropic released Claude Sonnet 5 on June 30, 2026 as its most agentic mid-tier model, promising near Opus 4.8 performance at a lower price. The benchmarks look strong, but developers and power users flooded X calling it a flop, pointing to higher token use, heavier refusals, and safety limits. This is the full picture of the backlash.



