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Anthropic releases Claude Sonnet 5.5 with updated knowledge, breaking changes

By PulseAugur Editorial · [1 sources] ·

Anthropic has released Claude Sonnet 5.5, which offers a more recent knowledge cutoff of June 2026 and maintains its previous pricing structure. This new model introduces five breaking changes for developers using Sonnet 5, affecting functionalities like disabling upfront thinking and forced tool use. While Sonnet 5 will remain available as a legacy option, developers are advised to migrate to Sonnet 5.5 to leverage the updated knowledge base and adapt to the new API behaviors. AI

IMPACT Developers must update their code to accommodate breaking changes in Sonnet 5.5, while benefiting from a more recent knowledge cutoff.

RANK_REASON Frontier-lab model release with system card [lever_c_demoted from frontier_release: ic=1 ai=1.0]

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic releases Claude Sonnet 5.5 with updated knowledge, breaking changes

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Frontier-lab model release with system card [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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model release, product
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COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · RAXXO Studios ·

    Claude Sonnet 5.5 Ships Faster and Breaks Five Things

    <ul> <li><p>Anthropic released Claude Sonnet 5.5 on September 28, priced identically to Sonnet 5 on every rate</p></li> <li><p>The reliable knowledge cutoff jumps five months, from January to June 2026, while default effort stays at high</p></li> <li><p>Five breaking changes hit …

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