Alex FinnMay 28, 202612m

Claude Opus 4.8 actually blew my mind...

TL;DR

Alex says Opus 4.8 is a major leap without a price hike — he calls the release a “smash home run,” says it beats GPT-5.5 on coding and benchmarks, and emphasizes that Anthropic kept pricing flat versus Opus 4.7.
Fast mode just got materially more usable — Claude’s fast mode was previously about 6x the cost of regular mode, but Alex says it’s now 3x cheaper and lands at roughly 2x regular pricing, making it realistic again for $200/month users.
The biggest hidden upgrade is multi-agent work via dynamic workflows — instead of one agent plodding through a task, Opus 4.8 can spin up tens to thousands of sub-agents to research, edit code, test, and run regressions in parallel.
Alex thinks this is basically ‘Mythos lite’ — his evidence is the reported 4x hallucination reduction and Anthropic’s note that Mythos-class models are coming to customers in the next few weeks.
His practical setup advice is conservative on context and aggressive on switching — he recommends moving normal Claude Code work to Opus 4.8 immediately, using regular context over the 1M-token mode, and defaulting effort to High before bumping to Extra or Max only when needed.
The real bottleneck is focus, not model quality — Alex’s strongest non-product point is that people waste the gains by prompting an AI and then doom-scrolling, and he argues focus will be the key differentiator for builders in 2026.

The Breakdown

Claude Opus 4.8 is so much better than 4.7 that Alex Finn thinks it may be a watered-down version of Anthropic’s teased “Mythos” model: same price, cheaper fast mode, far fewer hallucinations, and new multi-agent workflows that he says can compress months of work into an afternoon. He walks through exactly how to use it, why most people should switch immediately, and then puts it through his signature game-building benchmark where it edges past Opus 4.7 with the best first-person shooter result he’s seen yet.