Claude Sonnet 5.5 launches: 30% faster than Sonnet 5, up to 30% cheaper in practice
ClaudeDevs · x · 2026-09-29
Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family, along with a developer guide. It is smarter and 30% faster than Sonnet 5 at unchanged per-token prices, costing up to 30% less in practice since it needs fewer tokens. Because it thinks by default, responses can start with a thinking block, breaking code that reads content[0].text. Guidance: use Sonnet 5.5 for well-scoped everyday coding and polished documents; Opus 5.5 for complex judgment-heavy work; Haiku 5.5 arrives in weeks for high-volume, low-latency workloads. Effort is tunable via outputconfig.
Related event: Anthropic Launches Claude Sonnet 5.5: Over 30% Faster, Up to 30% Cheaper(58 posts)→
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