FINALLY: Fable 5 Destroys GPT 5.5 + Way Cheaper

[00:00:00]This thing is, of course, state-of-the-art in crushing benchmarks.

[00:00:03]In agentic coding, it leaves GPT-5.5 in the dust. There isn't a single benchmark it isn't winning on, and that should tell you something. This model does seem to have more serious safeguards in place. Like, if you ask it to do cybersecurity-related work, it can give you a denial and reroute to Opus 4.8.

[00:00:22]But, there seems to be a lot of false positives. Cybersecurity, biology, chemistry, distillation. There are a lot of non-malicious tasks that fall in those buckets. But, let's talk about the cost real quick. I think it is very likely this is the most powerful language model we've ever had our hands on, and that comes at a price. Claude 5 Fable uses two times the usage of Opus.

[00:00:45]So, it's two times the price. That puts it at $10 per million input tokens and $50 per million output tokens. Highly, highly expensive, but not nearly as bad as we were thinking. Originally, the predicted cost of the Mythos models was estimated to be like 80 to 120 dollars per million output tokens. That's astronomical and like twice what it actually turned out to be.