I spent hours testing Claude Opus 4.8 — these are the 5 biggest upgrades

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Claude Opus 4.8 arrived about a week ago, promising quite a few upgrades over its predecessor. Of course, we heard the same things about Opus 4.7 when it arrived, and yet the reality wasn’t as simple as that.

Early on, many Opus 4.7 users felt it was a pretty noticeable downgrade in certain aspects. While Opus 4.7 has arguably addressed many of its early issues, it’s not surprising that some users were nervous about what the next version might bring. Although I’ve certainly seen my share of complaints about Opus 4.8 on Reddit and other user communities , I’ve been pleasantly surprised by it.

Below, let’s take a look at five things Opus 4.8 does noticeably better than Opus 4.7 in my roughly 10-15 hours of combined use so far. After that, we’ll also look at areas where it has mostly stayed the same or even potentially slid backward a bit.

One of my least favorite things about Opus 4.7 is that it tends to be too agreeable, no matter how often I tell it I value constructive feedback and realism on my creative projects. For example, I love alternate timeline scenarios as a source of entertainment. I sometimes push the boundaries of realism here, so I appreciate being called out when my premise just doesn’t work.

That made Opus 4.7 frustrating most of the time, but the good news is that Opus 4.8 is a real step forward.

I spent many hours running both models through many of the same questions, and a few responses stood out. I asked each model what would happen if the Black Plague had wiped out all of Europe completely. This was a trick question, of course. Unless the Black Plague was an entirely different event caused by a different disease, the scenario isn’t possible. Bubonic plague simply isn’t capable of that complete an apocalypse, and frankly, neither is any disease outside of fringe bioweapon scenarios.

Despite the impossibility, Opus 4.7 only described this as a “more radical counterfactual than the historical 30 to 50 percent mortality” before jumping into the consequences with no further caution.