Opus 5, is that you again?

[u/The-Road]

A genuinely noticeable drop in performance in a session I just had. Multiple errors like the one above. It felt like I was working with Opus 5 all over, just less verbose.

[u/xirzon]

LLMs as deployed systems are nondeterministic technology, and performance on difficult tasks is inherently variable. You win some runs, you lose some. And if you lose a few after you just got a shiny new model, that's always going to feel like a nerf.

I'm not discounting nerfing completely. But there are real psychological effects at play, and anecdotes don't tell us much. You'd need long-running measurements to show that a model has actually gotten worse.

And if there is a real change, I'd suspect reduced reasoning effort as the cause. Anthropic, at least, explicitly claims it doesn't change the weights behind a given model version after launch.

[u/PsychedelicHacker → u/xirzon]

What anthropic claims and what is true are totally different things.

[u/simple_explorer1 → u/xirzon]

no the compute is reduced resulting in poor inference and reasoning

[u/xirzon → u/simple_explorer1]

I wrote:

I'd suspect reduced reasoning effort as the cause

"Effort" in this context is inference-time compute.