Machine Heart

Sep 28, 2026 · Artificial Intelligence

Claude Sonnet 5.5 Launches at Half Opus 5.5 Price, Nears Its Performance

Anthropic released Claude Sonnet 5.5, which runs over 30% faster and costs up to 30% less than its predecessor, while matching Opus 5.5 on many benchmarks at half the price; it excels in coding, long-horizon tasks, and image understanding, with improved safety alignments and new distillation protections.