Claude Sonnet 5.5 nears Opus 5.5 at half the price
Anthropic released Claude Sonnet 5.5 on September 28, 2026, a mid-priced model that scores 70.6% on Terminal-Bench 4.0 — ahead of the flagship Opus 5.5's 66.4% — at half the price of Opus at $2 per mi…