Anthropic releases Claude Opus 4.8

Background

On 28 May 2026 Anthropic released Claude Opus 4.8. Anthropic described it as a modest improvement on Opus 4.7 at the same price. ^[1]

What happened

Fast mode became three times cheaper, at $10 per million input tokens and $50 per million output tokens. ^[1]

Claude Code gained dynamic workflows, which run hundreds of parallel subagents. The feature was offered as a research preview for Enterprise, Team and Max customers. ^[1]

An effort selector came to claude.ai and Cowork on all plans. ^[1]

Key details

Anthropic said the model was four times less likely than Opus 4.7 to let flaws in its own code pass unremarked. ^[1]

Anthropic also said Mythos-class models would come to all customers in the coming weeks. ^[1]

Fast mode is an option that makes a model produce output faster, at a higher price. An effort selector is a control that lets a user choose how much reasoning a response should use. A subagent is a smaller agent started by a larger agent to handle one part of a task, and parallel subagents work on separate parts at the same time.

Impact

The price cut for fast mode and the effort selector on all plans widened access to those features. ^[1]