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Claude Sonnet 4.5 upgrade breaks startup API, prompts rollback

A startup experienced significant issues when upgrading to Anthropic's Claude Sonnet 4.5, which caused their API system to malfunction. The model incorrectly processed parameters and responded with clarifying questions instead of the expected JSON output. Resolving this problem necessitated a rollback of all integrations and a thorough re-evaluation process. AI

IMPACT Highlights the critical need for robust testing and validation when integrating LLMs into production systems to prevent costly failures.

RANK_REASON A specific product integration issue with an existing model, not a new model release.

Read on Mastodon — fosstodon.org →

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COVERAGE [1]

  1. Mastodon — fosstodon.org TIER_1 English(EN) · [email protected] ·

    A startup's upgrade to Claude Sonnet 4.5 broke its API system. The model folded parameters into the wrong field and asked clarifying questions instead of return

    A startup's upgrade to Claude Sonnet 4.5 broke its API system. The model folded parameters into the wrong field and asked clarifying questions instead of returning JSON. The fix required rolling back and re-qualifying every integration. Lesson: treat evaluation suites as the spec…