Am I falling into the hype train or is Fable 5.1 really this better compared to everything else? Thinking of upgrading to x20 from x5 just for Fable

So I was a Pro user until last week I have subscriptions to all 3 American frontier labs - all base $20 until last week I’ve been working with LLMs since before Claude Code or even the VS Code extension even existed. I kind of self learned how to code on the job as a necessity (founder in an early stage startup, new hire bailed at last moment, backup guy was incompetent, product kept pivoting too fast to hire someone else). I had some prior experience from college but nothing close to actually useful for real world product dev Being that early I had to develop some processes around working with LLMs and I had assumed LLMs won’t be able to do anything end to end. Before Antigravity, Codex and CC, cursor did not seem to make sense so I used ChatGPT in chat to write code, learn patterns and call it out in chat itself and then copy paste. Antigravity launch in December — and it being included in my monthly Google plan made my try actual harnesses for the first time because they gave this IDE you could see agents building in. The terminal only or chat only paradigm simply didn’t make sense to me because I didn’t trust LLMs blindly So I developed all my processes around brainstorming every tiny algorithm details with a very smart LLM in a chat and then treating the actual LLM like a dumb pseudocode to python translation machine — and even then I wrote a lot of guardrails around it IDE extensions just didn’t feel as good as a full Agentic IDE where Antigravity shined. Then comes AG 2.0 and the IDE becomes an afterthought. I realize I have to try the chat first interfaces now. So that is when I starting using AG 2.0 — and then I realized it works. And Google Gemini had a generous allowance so I kinda got used to working with flash — remember I was not trusting the LLMs fully Comes August. Now we are stable since our last pivot. We were alone in the market we are in right now so no sense of urgency. And then we smell competition on horizon. And that forces urgency. I have to rollout features quickly. I have to integrate some big ass APIs. I have $120 in CC promo credits. And I blow them on Fable + Sonnet within my included allowance — and it one shots the API integration. I am blown away I switch to CC slowly. And then the official Desktop app comes in. I migrate full time. Sonnet inclusion is generous on pro, and I go back to my old ways, handholding it and switching to AG to intermittently. But then I start using Opus. And it requires less planning on my behalf (yes, the Opus 5 this sub hates) So I upgrade to x5 for Opus. Now I don’t get bottlenecked. But then I get a taste of Fable. It is not like an intern. It is a fucking SWE. That is what it feels like. Now maybe it is due to me changing my style recently. Maybe because I didn’t give the same problem to Opus. IDK. But it feels smart. It solves problems which I would have to otherwise painstakingly — and with a lot of back and forth. Its first draft is good enough that I can’t break it (and my team hates me for being able to break every fucking thing). It is a genie. But an expensive one Now obviously it is not unlimited on 5x. So here’s my question: to people who have actually tested Fable 5.1 and Opus (4.8 or 5, whichever you like) on similar real tasks — am I hallucinating or is it really this good? To people on 20x: would you recommend upgrading specifically for Fable 5.1?