Fable 5 is the biggest step up I've felt in our models since Opus 4.5 back in November. After 4.5 came out I uninstalled my IDE when I realized that I'd been doing 100% of my coding in a terminal for a few weeks. With Fable， it's felt like Claude has stepped up from being a coding agent to a thought and design partner in building the product. Fable has judgement， taste， and dimensionality in a way that previous models didn't， leading me to trust it more with the most complex work.

I think the first time I had this realization was when I asked Fable to debug something. It is the first model I have used that was so methodical and precise， taking measurements and adding logs then verifying that it truly fixed the issue before declaring victory.