It’s great. However, like all evals, the verdict depends on the tasks - so I’ll describe the tasks too.

Before GPT 5.6: Fable orchestrating GPT 5.5

Right before GPT 5.6 came out, Fable was available on Claude subscription plans. I already had a $100/month Codex subscription. For Claude, as I only had a $20/month subscription, I could only use Fable in the following way:

  • Fable set to low
  • Fable using this skill to actually use GPT 5.5 as a researcher & coder

I found this paradigm on Twitter. To figure out if this was better than just using GPT 5.5, I ran two evals:

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