So, IMO, they have much better capability internally because they have 'unlimited' usage. I also suspect a lot of 'Fable' is just a shit ton of nested subagents doing necessary backend work with a very solid fine tuned LLM conversing with the user.

I worked recently for a German megacorp, for whatever reason they gave us unlimited access to a bunch of models, up to sonnet 4.5/Gpt o1 etc, so not the best or latest models. And no agentic tools.

So I built a custom Claude Code clone because they exposed the api from their custom 'LLM Chat' clone in the client and accepted my user credentials for access.

Essentially a frankenstein AI harness using various models for their strengths, including using the OpenAI best model for memory context consolidation and compaction + Sonnet as orchestrator, etc. I was able to spawn 20+ agents to do my work and basically automate my entire job at that corp. I think my internal bill was something like 5k euros per month and I was being careful to not abuse it...

It was better than the best you could get from claude at the time (about a year ago now I think), in terms of task performance completion.

So imagine what someone with essentially infinite spend can do with endless fable agents. AKA US government and Anthropic internal.