New model: Claude Opus 4.8

Thursday, 28 May 2026

AI summary

Written by AI from the official notes. Check them for exact details.

Claude Opus 4.8 has been released with enhanced token support.

Supports a 1M token context window by default
Allows up to 128k max output tokens
Includes same tools and features as Claude Opus 4.7

Why it matters: Users needing extensive context handling and output capabilities should consider upgrading to Claude Opus 4.8.

Official notes on platform.claude.com Introducing Claude Opus 4.8

Full release notes

We've launched Claude Opus 4.8 (claude-opus-4-8), our most capable widely released model. Claude Opus 4.8 supports a 1M token context window by default on the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry, 128k max output tokens, and the same set of tools and platform features as Claude Opus 4.7. See the migration guide for baseline settings, features, and migration guidance.