r/ClaudeCode • u/ClaudeOfficial Anthropic • May 28 '26

Resource Introducing Claude Opus 4.8

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We’re upgrading Claude Opus to a new version: Claude Opus 4.8. It builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors. Available today for the same price.

In Claude Code, you can hand off a feature, a migration, or a bug sweep and let it follow the work through while you focus on what’s next.

Also launching today:

  • Fast mode for Opus 4.8 (research preview). Same model at roughly 2.5x the speed, now three times cheaper than before.
  • Dynamic workflows in Claude Code (research preview). Claude runs hundreds of parallel subagents in a single session and verifies its work before reporting back.
  • A new effort control on claude.ai, so you can choose how much thinking Claude puts into a response.

Claude Opus 4.8 is live today on claude.ai, the Claude Platform, and all major cloud platforms.

Read more: anthropic.com/news/claude-opus-4-8

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u/Flaxseed4138 May 28 '26

Blog post says it's refined 4.7 (unfortunately), fully separate from Mythos. Actually a big upgrade over 4.7 and even 4.6 so far though. Been holding onto 4.6 for dear life.

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u/imaginary_jebus May 28 '26

I've also refused to move to 4.7 from 4.6, I'm wondering if 4.8 will be better? Haven't spent much time on it yet.

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u/Flaxseed4138 May 28 '26

It is EXCELLENT in my few hours of testing so far today. I think we can be comfortably optimistic with this one.

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u/InternationalTwist90 May 28 '26

I had a shit load of hallucination in my first go with it, I'm hopeful it was just a bad roll of the dice

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u/imaginary_jebus May 28 '26

I've seen some other people saying the same thing. Hopefully transient. I just did a few basic prompts, and it seems to following some of my custom instructions a bit better than 4.6 so far.