Anthropic ships Claude Sonnet 5.5: 30% faster, up to 30% cheaper than Sonnet 5
rohanpaul_ai · x · 2026-09-29
Anthropic officially introduced Claude Sonnet 5.5, the second model in the Claude 5.5 family — a clear upgrade over Sonnet 5 that runs more than 30% faster and costs up to 30% less for most workloads. Developer Rohan Paul (158K followers) followed up praising Opus 5.5's "intelligence per token" as genuinely great.
Related event: Anthropic Launches Claude Sonnet 5.5: Over 30% Faster, Up to 30% Cheaper(58 posts)→
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