/Tech4h ago

Brundage Finds Fable AI Gains Less Dramatic Than Expected

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Miles Brundage@Miles_Brundage#22inTech

Fable's very good, though the change is a bit less dramatic than I might have expected based on how it was described by Ants

Perhaps because of some combination of 1. They rarely use other companies' models (e.g. 5.5), 2. They never really used Opus 4.8 Max bc they had Mythos

10:38 PM · Jun 10, 2026 · 2.9K Views
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Miles Brundage@Miles_Brundage

(and, in turn, Opus 4.8 Max had a lot of Mythos's intelligence baked into it already)

Miles Brundage@Miles_Brundage

Fable's very good, though the change is a bit less dramatic than I might have expected based on how it was described by Ants

Perhaps because of some combination of 1. They rarely use other companies' models (e.g. 5.5), 2. They never really used Opus 4.8 Max bc they had Mythos

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Miles Brundage@Miles_Brundage

*I'm talking about vague subjective descriptions from individual Ants on social media, not saying the evals/misuse risks etc. were exaggerated in official blog posts/system cards etc.

Though I think officially framing it as a step change was maybe ill-advised given the Opus 4.8 thing

Miles Brundage@Miles_Brundage

(and, in turn, Opus 4.8 Max had a lot of Mythos's intelligence baked into it already)

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Hunter Gon@gonlenidefi

@Miles_Brundage wait so ur saying the jump from mythos wasnt that dramatic because they were already on something close to fable internally

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@Miles_Brundage interesting how being locked into one model can warp the whole reference frame

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Invincible@InvincibleEdge

@Miles_Brundage heard antidoto is a newer sphinx from model jump maybe that fits with it better

4h