Modelpeers

Claude Opus 4.8 changelog

Every change to Claude Opus 4.8 that Modelpeers has recorded, newest first, each with the source it came from. The record starts May 28, 2026.

All (4)Releases (1)Retiring (2)Breaking changes (1)

May 2026

Claude Opus 4.8 character

Claude Opus 4.8

Model at Anthropic

New release

Claude Opus 4.8 released

Claude Opus 4.8 launched with a 1M token context window by default and 128k max output, priced at $5 / $25 per million tokens like Opus 4.7. Fast mode costs $10 / $50.

Who is affected:
Developers and subscribers using Claude Opus 4.7.
What to do:
Test claude-opus-4-8 and note that effort now defaults to high.

3 incidents are listed on the Claude Opus 4.8 page. Get this changelog in a feed reader with the RSS feed.