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Claude Fable 5.1 and Claude Mythos 5.1

anthropic.com

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Re: Claude Fable 5.1 and Claude Mythos 5.1

#11

Has anyone been able to get anything substantial done with Fable in the first place? I more or less had totally given up on using it since the alignment checks were so sensitive that it pretty much always threw me back to Opus.

It's probably a good model for folks doing basic software stuff, or humanities related tasks, but I work in cybersecurity on the defense/detections side and I haven't been able to use it for anything even with being in the CVP. It downgrades to Opus every time.

Re: Claude Fable 5.1 and Claude Mythos 5.1

#13

Has anyone been able to get anything substantial done with Fable in the first place? I more or less had totally given up on using it since the alignment checks were so sensitive that it pretty much always threw me back to Opus.

I hear this a lot and I believe it because I've heard it from so many people, but I have never run into this in my work, and neither has anyone I know in real life.

I don't use Fable for a ton of implementation work, but I use it a lot for planning, so maybe that's related to it. For planning though, I've had a very good experience with Fable and implementing with Opus.

Re: Claude Fable 5.1 and Claude Mythos 5.1

#15

Has anyone been able to get anything substantial done with Fable in the first place? I more or less had totally given up on using it since the alignment checks were so sensitive that it pretty much always threw me back to Opus.

Same. Both times I tried it was adamant that I can only use opus. I was reworking my company content (financial services) and it was not helpful.

Re: Claude Fable 5.1 and Claude Mythos 5.1

#17
post #6

Tbh with that price , not even willing to try . What are the benefits for a regular coding agent ? I barely have any errors already with 4.8 level , eg grok 4.6 , gpt 5.6 sol/terra behind router . Why do I need to pay so much money for this ? Any reason ?

Maybe you don't! It is very possible that your problems don't actually need frontier-level artificial intelligence.

Re: Claude Fable 5.1 and Claude Mythos 5.1

#20
post #4

Bit of a discount if you're using caching: > same input and output prices, with cache reads at a quarter of the cost This should impact any long-running agent since subsequent calls can benefit from cached reads for previous transcripts.

~30% reduction in real-world task cost vs. Fable 5 in our evals at viktor.com ! Caching goes a looong way
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