Claude Opus 4.8
Claude Opus 4.8, released May 28, 2026, is a major refresh focused on codebase-scale migrations and sharper agentic judgment, featuring a dynamic workflows research preview that runs hundreds of parallel sub-agents in a single session, plus a manual effort-control panel. It offers a 3× cheaper Fast mode at the same $5/$25 per million input/output tokens, is available on Anthropic native, Amazon Bedrock, AWS Claude Platform, Google Cloud, and Microsoft Foundry, and teases an upcoming Mythos-class model series for limited organizations.