Amazon-Backed Anthropic Introduces Claude Sonnet 5.5 Model

02:42 PM EDT, 09/28/2026 (MT Newswires) -- Amazon-backed (AMZN) Anthropic said Monday it is introducing new Claude Sonnet 5.5 model that costs 30% less per task and generates output 30% faster when compared with its predecessor Sonnet 5. Sonnet 5.5 improves on Sonnet 5 across domains and even performs comparably to Opus 5.5 at Max effort on several evaluations, according to a statement. On the company's automated behavioral audit, Sonnet 5.5 improves on or matches Sonnet 5 on most measures of safety alignment and resistance to misuse, the company said. Price: 246.64, Change: -3.03, Percent Change: -1.21