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Anthropic Launches Claude Sonnet 5: First Sonnet-Class Model to Outscore Opus 4.8

Anthropic releases Claude Sonnet 5 as the new default model for Free and Pro users, featuring a 1-million-token context window. Sonnet 5 scores 1,618 on GDPval-AA v2, becoming the first Sonnet-class model to outscore the concurrent Opus flagship.

Tuesday June 30, 2026
Anthropic Launches Claude Sonnet 5: First Sonnet-Class Model to Outscore Opus 4.8

Summary

Anthropic releases Claude Sonnet 5 as the new default model for Free and Pro users, featuring a 1-million-token context window. Sonnet 5 scores 1,618 on GDPval-AA v2, becoming the first Sonnet-class model to outscore the concurrent Opus flagship.

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Q: What is this story about? A: Anthropic releases Claude Sonnet 5 as the new default model for Free and Pro users, featuring a 1-million-token context window. Sonnet 5 scores 1,618 on GDPval-AA v2, becoming the first Sonnet-class m…

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