Why does a 3.4x price spread survive at comparable capability? Because this is a price war (not efficiency) and discounts built to buy market share expire the day the share is won.
Looking solely at benchmarks and considering the price-performance ratio, Fable 5.1 represents a significant leap forward.
In Cursor Bench, for example, Fable 5.1 High performs considerably better than Sol 5.6 Max and is also less expensive.
Similarly, Fable 5.1 shows a significant improvement in Artificial Analysis Benchmark compared to its predecessor.
If it's now less verbose, more efficient, and uses less red flagging, it could be a truly excellent release.