I have a couple of decades of software development experience, mostly in what you could call arcane domain-specific scientific modeling. I have been highly skeptical about LLM industry hype, but try out LLMs every few months just to check the state of the art. Recently I’ve used Claude Code with the Fable model for intensive, 3-4 hour thorny software design and implementation discussions, and it’s unreal how good it is. I feel like I’m interacting with a whole different category of thing than Opus which I used last time. After I figured out how to tone down its register (no dev bravado or relentless appositives and analogies; prefer measured, cultivated discourse calibrated to scientific literature) I just cannot get over how intelligent and perceptive this thing seems. Due to model availability and pricing changes, I switched back and forth from Fable to Opus over the last two days and it’s night and day. After using Fable, Opus feels like a slowly decaying doom loop hopelessly confused by its own output. And after Opus, Fable is like having a discussion with all the most intelligent, reasonable, perceptive people I’ve ever met but much faster and clearer to communicate with. Like a room full of professors and PhD students hyper-specialized in every field from operations research to the sociology of religion, and able to catch and explain my every mistake even in complex abstract reasoning. It’s genuinely a bit shocking. Do we know specifically what has changed that explains this apparent step change in the experience of interacting with LLMs? submitted by /u/atonale
Originally posted by u/atonale on r/ClaudeCode
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