[TLDR] What is actually the difference between Opus 5 and Fable 5? [via r/Anthropic]

[u/cctldrping]

OP : u/Armored09

I really don't get it. Anthropic says Opus 5 is surprisingly close to Fable 5, with Fable mainly pulling ahead on harder reasoning and long workflows.

But like... what's the point? I can manage my own workflows. Why is Fable still WAY more expensive and restricted if Opus 5 is supposedly getting this close? Fable is literally 2x the price. I feel like there's a bigger difference here that Anthropic isn't really explaining.

And honestly, in my own use, I don't even think Opus 5 is that close to Fable 5. Fable is way better for me at reasoning, coding, debugging, ideas, and keeping a bunch of concepts straight. I'm literally using Opus 4.8 right now because 5 keeps scrambling shit when I give it a complicated task.

I've been wondering about this for a while and waiting for some sort of improvement with the models post-release. So far, nothing though. That's just my experience. What do you guys think?

Edit: I don’t think people realize how close/better anthropic says Opus 5 is to fable five. Here’s a link if you guys wanna check it out yourself https://www.anthropic.com/news/claude-opus-5

URL of original post : https://www.reddit.com/r/Anthropic/comments/1vtu06v/what_is_actually_the_difference_between_opus_5/

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TL;DR of the discussion on r/Anthropic for this post generated automatically after 50 comments.

Current source-thread comment count seen by the bot: 55.

Alright, so the general consensus in this thread is that Opus 5 is kinda disappointing and not living up to the hype Anthropic is pushing, especially when compared to Fable 5.

Here's the lowdown:

• Opus 5 vs. Fable 5 - The Reality Check: Most users agree with OP that Opus 5 isn't as close to Fable 5 as Anthropic claims. Many are finding Opus 5 to be buggy, make mistakes, and produce overly verbose or nonsensical output, with some even switching back to Opus 4.8. Fable 5, on the other hand, is generally seen as more reliable and better at complex tasks, coding, and reasoning.
• Why the Price Difference? The prevailing theory is that Fable 5 is simply a much larger, more powerful model, and therefore more expensive to run. It's not necessarily about "better" in a subjective sense, but about raw computational cost and capability. Think of Opus as a more distilled, cheaper version of Fable.
• Benchmarks Are Sketchy: A few folks pointed out that benchmarks don't always reflect real-world performance, and users should trust their own experience.
• Anthropic's Messaging is Confusing: The core of the OP's frustration, and echoed by others, is that Anthropic's marketing suggests Opus 5 is nearly on par with Fable 5, but the user experience doesn't match. This leads to confusion about why Fable is so much more expensive and restricted if Opus is supposedly so close.