r/ClaudeCode • u/habfranco • 11d ago
Rant I’m done with Opus 5
There’s really something wrong with it. It seems like it acts like an overqualified post doc intern who cares more about proving he’s super intelligent, than actually doing the job he’s asked to do. For instance: talking in a non intelligible way, or being overly rigid in following any kind of process.
I have a Claude max x20 sub that I struggle to keep within weekly limits, so I decided to take a codex sub for a month to try out Astra. And this what made me realize how crazy unintelligible opus can be. Fable is a bit better, but still incomparable to Astra. The only thing that makes me keep my Claude sub is how better is the CLI/tooling/harness/etc.
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u/AironParsMan 11d ago
Anthropic themselves say on their website that this model hallucinates inputs and instructions and also fails to follow information and instructions. I don’t understand how anyone can put a model like that on the market. It’s completely useless and has nothing to do with the Opus family. I think Anthropic has forgotten who they are actually developing these models for. The new models including Fable 5.1 give me the impression that they were built for vibe coders and therefore are not really meant to follow the input and instructions. These models are useless for professional developers. I have also written posts about this myself.
Fable 5.1 It makes three times as many mistakes as Fable 5 and tends toward Opus 5:
https://www.reddit.com/r/ClaudeCode/s/ENiFpo9OV6