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Claude Opus 4.5

anthropic.com

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Re: Claude Opus 4.5

#101

Post by blurbleblurble »

unsupp0rted wrote: post #46

This is gonna be game-changing for the next 2-4 weeks before they nerf the model. Then for the next 2-3 months people complaining about the degradation will be labeled “skill issue”. Then a sacrificial Anthropic engineer will “discover” a couple obscure bugs that “in some cases” might have lead to less than optimal performance. Still largely a user skill issue though. Then a couple months later they’ll release Opus 4…

I fully agree that this is what's happening. I'm quite convinced after about a year of using all these tools via the "pro" plans that all these companies are throttling their models in sophisticated ways that have a poorly understood but significant impact on quality and consistency.

Gpt-5.1-* are fully nerfed for me at the moment. Maybe they're giving others the real juice but they're not giving it to me. Gpt-5-* gave me quite good results 2 weeks ago, now I'm just getting incoherent crap at 20 minute intervals.

Maybe I should just start paying via tokens for a hopefully more consistent experience.

Re: Claude Opus 4.5

#102

Post by losvedir »

llamasushi wrote: post #30

The burying of the lede here is insane. $5/$25 per MTok is a 3x price drop from Opus 4. At that price point, Opus stops being "the model you use for important things" and becomes actually viable for production workloads. Also notable: they're claiming SOTA prompt injection resistance. The industry has largely given up on solving this problem through training alone, so if the numbers in the system card hold up under a…

I almost scrolled past the "Safety" section, because in the past it always seemed sort of silly sci-fi scaremongering (IMO) or things that I would classify as "sharp tool dangerous in the wrong hands". But I'm glad I stopped, because it actually talked about real, practical issues like the prompt injections that you mention. I wonder if the industry term "safety" is pivoting to refer to other things now.

Re: Claude Opus 4.5

#103

Post by [deleted] »

stavros wrote: post #11

Did anyone else notice Sonnet 4.5 being much dumber recently? I tried it today and it was really struggling with some very simple CSS on a 100-line self-contained HTML page. This never used to happen before, and now I'm wondering if this release has something to do with it. On-topic, I love the fact that Opus is now three times cheaper. I hope it's available in Claude Code with the Pro subscription. EDIT: Apparently…

[deleted]

Re: Claude Opus 4.5

#104

Post by chinathrow »

gregable wrote: post #71
chinathrow wrote: post #42

Earlier quoted context omitted.

I gave Sonnet 4.5 a base64 encoded PHP serialize() json of an object dump and told him to extraxt the URL within. It gave me the Youtube-URL to Rick Astley.

it. Not him.

It's Claude. Where I live, that is a male name.

Re: Claude Opus 4.5

#108

Post by Robdel12 »

redfloatplane wrote: post #90

On my Max plan, Opus 4.5 is now the default model! Until now I used Sonnet 4.5 exclusively and never used Opus, even for planning - I'm shocked that this is so cheap (for them) that it can be the default now. I'm curious what this will mean for the daily/weekly limits. A short run at a small toy app makes me feel like Opus 4.5 is a bit slower than Sonnet 4.5 was, but that could also just be the day-one load it's pres…

Right! I thought this at the very bottom was super interesting

> For Claude and Claude Code users with access to Opus 4.5, we’ve removed Opus-specific caps. For Max and Team Premium users, we’ve increased overall usage limits, meaning you’ll have roughly the same number of Opus tokens as you previously had with Sonnet. We’re updating usage limits to make sure you’re able to use Opus 4.5 for daily work. These limits are specific to Opus 4.5. As future models surpass it, we expect to update limits as needed.

Re: Claude Opus 4.5

#109

Post by ximeng »

andai wrote: post #40

Why do they always cut off 70% of the y-axis? Sure it exaggerates the differences, but... it exaggerates the differences. And they left Haiku out of most of the comparisons! That's the most interesting model for me. Because for some tasks it's fine. And it's still not clear to me which ones those are. Because in my experience, Haiku sits at this weird middle point where, if you have a well defined task, you can use a…

It’s a pretty arbitrary y axis - arguably the only thing that matters is the differences.

Re: Claude Opus 4.5

#110

Post by easygenes »

config_yml wrote: post #53
vunderba wrote: post #36

Earlier quoted context omitted.

My workflow was usually to use Gemini 2.5 Pro (now 3.0) for high-level architecture and design. Then I would take the finished "spec" and have Sonnet 4.5 perform the actual implementation.

I use plan mode in claude code, then use gpt-5 in codex to review the plan and identify gaps and feed it back to claude. Results are amazing.

Yeah, I’ve used vatiations of the “get frontier models to cross-check and refine each others work” pattern for years now and it really is the path to the best outcomes in situations where you would otherwise hit a wall or miss important details.
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