I'll be the first to tell you I love the open models, the fact they exist and my ability to use them. However I doubt K3 is "~Fable" any more that any of the past ones have been Open 4.8 or similar claims. I've tried many of these (not K3 yet, I do want to) and they don't at all feel equivalent to what they score on benchmarks.
I want them to get better, I look forward to each new release, I play around with open models (often quants, but I've used full versions via OpenRouter), but they aren't the same as the offerings from Anthropic/OpenAI in my opinion (yet!).
This is the best side-by-side comparison I've seen so far, we're still waiting for it to become available for download, then we should get much better analyses.
https://news.ycombinator.com/item?id=48999291
I do agree that the benchmarks do not tell much of the story, but this applies to the closed models as well ime.