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Anthropic releases Sonnet 5.5, breaking compatibility with Sonnet 5 code

By PulseAugur Editorial · [1 sources] ·

Anthropic has released Sonnet 5.5, a new iteration of its language model, on September 28th. This update introduces changes that may break compatibility with existing Sonnet 5 code, particularly concerning forced tool choices and thinking blocks. The pricing for Sonnet 5.5 remains the same as its predecessor at $2 per million input tokens and $10 per million output tokens. AI

IMPACT This release may require developers to update their existing codebases to maintain compatibility with the new model.

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

Read on Medium — Claude tag →

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

Anthropic releases Sonnet 5.5, breaking compatibility with Sonnet 5 code

How we ranked this

Signal score
44 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Significant
Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
model release, product
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. Medium — Claude tag TIER_1 English(EN) · Automation Labs ·

    Sonnet 5.5 Landed Sept 28. 5 Ways It Breaks Your Sonnet 5 Code.

    <div class="medium-feed-item"><p class="medium-feed-image"><a href="https://medium.com/@automation.labs/sonnet-5-5-landed-sept-28-5-ways-it-breaks-your-sonnet-5-code-2fbf25fdee97?source=rss------claude-5"><img src="https://cdn-images-1.medium.com/max/2600/0*geiYnUrBbY7Dldre" widt…

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