A very interesting test here, the same exact settings were run with Fable 5 against our Gold Standard which is run with Grok 4.3. We've tested just about every model in trading and Grok 4.3 always performs best, but we haven't tested Fable until now. The results:
Grok 4.3 - 131.89% profit over a 6 week period, this is the mean of 5 identical backtests, so a very robust result.
Fable 5 - 19% profit, same settings same timeframe... exact same test.
However, that doesn't tell the full story. Using
@Shekel_Agentic MCP tools we drilled down into the Fable test and discovered that it was actually more directionally correct than Grok, also it had a 79% win rate, which is fantastic. Fable however was very cautious with size and put lots of thought managing exits, he was banking profits while Grok was YOLOing the $VVV parabola.
In any case, the results are very interesting and worth some more testing with Fable to see if we can craft some adjustments to the prompt to improve his sizing and conviction. If so, the results could be explosive, definitely a thread worth pulling, and all made possible with Shekel's tools.