Claude Opus 5 changelog

Every change to Claude Opus 5 that Modelpeers has recorded, newest first, each with the source it came from. The record starts Jul 24, 2026.

All (14)Releases (3)Retiring (1)Breaking changes (3)Quality (2)Benchmarks (5)

July 2026

Perplexity and Claude Opus 5

2 products from Perplexity AI and Anthropic

Now availableJul 27, 2026

Claude Opus 5 available in Perplexity Search and Computer

Claude Opus 5 went live across Perplexity Search and Computer. Perplexity says it beat every model it tested on its WANDR benchmark except Fable 5, at 57% lower cost per task.

Claude Opus 5

Model at Anthropic

New releaseJul 24, 2026

Claude Opus 5 released

Claude Opus 5 launched at $5 / $25 per million tokens, the same as Opus 4.8, with a 1M token context window and 128k max output. It became the default model on Claude Max.

Who is affected:: Developers and subscribers using Claude Opus 4.8.
What to do:: Test claude-opus-5. Disabling thinking now fails at xhigh or max effort.

Claude Opus 5 and GitHub Copilot

2 products from Anthropic and GitHub

Now availableJul 24, 2026

Claude Opus 5 available in GitHub Copilot

Claude Opus 5 is available on Copilot Pro+, Max, Business and Enterprise at provider API list price. GitHub notes its cyber safeguards may block some security-related requests.

Who is affected:: GitHub Copilot users on Pro+ and above.
What to do:: Copilot Business and Enterprise admins: enable the Claude Opus 5 policy if you want it.

8 incidents are listed on the Claude Opus 5 page. Get this changelog in a feed reader with the RSS feed.