Claude API changelog

Every change to Claude API that Modelpeers has recorded, newest first, each with the source it came from. The record starts Sep 17, 2025.

All (13)Releases (3)Breaking changes (2)Prices/limits (7)Quality (1)

September 2025

Claude API

API at Anthropic

Quality report · Confirmed by the labSep 17, 2025

Anthropic postmortem: three infrastructure bugs degraded Claude responses

Anthropic confirmed that three infrastructure bugs intermittently degraded Claude response quality between August and early September 2025, and said it never reduces model quality because of demand or load.

41 incidents are listed on the Claude API page. Get this changelog in a feed reader with the RSS feed.