Anthropic's Claude Sonnet 5 Closes In on Opus 4.8 at a Fraction of the Price

Launched at $2/$10 per million tokens (promo) and $3/$15 after August 31, Sonnet 5 scores 1,618 on GDPval-AA v2, a statistical tie with Opus 4.8's 1,616. It hits 63.2% on SWE-bench Pro, up from Sonnet 4.6's 58.1%, and uses an updated tokenizer that increases token consumption.