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Fable is strongly believed to be around 10T. The most conservative estimate I've seen is 8T. Eg: https://www.reuters.com/technology/bytedance-targets-mega-ai-m

by nl 2mo ago

Fable is strongly believed to be around 10T. The most conservative estimate I've seen is 8T. Eg: https://www.reuters.com/technology/bytedance-targets-mega-ai-model-nearing-anthropics-mythos-ft-reports-2026-08-07/ https://www.reuters.com/technology/bytedance-targets-mega-ai... That reports Mythos as 8T and Fable as 5T, but I think they mean Opus as 5T, which is widely known, eg: https://eu.36kr.com/en/p/3760679047267075?ref=explainx https://eu.36kr.com/en/p/3760679047267075?ref=explainx Both Grok and Bytedance are training 10T models.

andai 2mo ago
Wasn't Opus ~1.5T and Fable is about twice that?
stymaar 2mo ago
The fact that Musk claims Opus is 5T to justify why Grok is far behind should be taken with a massive grain of salt given he's a recidivist mythomaniac. Honestly if Opus is 5T parameters while being matched by the biggest open models that are at least twice smaller, it would mean that the US is already behind China in the AI race, despite a significant edge in compute.
- WinstonSmith84 2mo ago
  Yes. And Opus goes a very long way compared to Fable, Anthropic isn't doing any favour, it's clearly just 2 models with a very different amount of parameters.
- nl 2mo ago
  The open models don't really match Opus. For example I regularly do Fable+Opus agentic coding runs over 24 hours without intervention. I think I've had GLM do a run that was a few hours. That's the closest I've had an open model come on that kind of work.
  - stymaar 2mo ago
    Even if they don't match current-day Opus in everything, they do beat 6 month old Opus, which we have no reason to believe it was smaller than the latest version.
johnnyApplePRNG 2mo ago
If Fable is seriously around 10T and Kimi K3 sidles up to it at 2.4T That would be extremely surprising and a massive blunder by Anthropic in model design architecture ... which I highly doubt to be the case.
- nl 2mo ago
  In real world comparisons K3 is somewhere between Sonnet and Opus. Fable is just a completely different (higher) level. The long tail of tasks and queries is where you see the difference.

by nl 2mo ago

andai 2mo ago

Wasn't Opus ~1.5T and Fable is about twice that?

stymaar 2mo ago

The fact that Musk claims Opus is 5T to justify why Grok is far behind should be taken with a massive grain of salt given he's a recidivist mythomaniac. Honestly if Opus is 5T parameters while being matched by the biggest open models that are at least twice smaller, it would mean that the US is already behind China in the AI race, despite a significant edge in compute.

WinstonSmith84 2mo ago
Yes. And Opus goes a very long way compared to Fable, Anthropic isn't doing any favour, it's clearly just 2 models with a very different amount of parameters.
nl 2mo ago
The open models don't really match Opus. For example I regularly do Fable+Opus agentic coding runs over 24 hours without intervention. I think I've had GLM do a run that was a few hours. That's the closest I've had an open model come on that kind of work.
- stymaar 2mo ago
  Even if they don't match current-day Opus in everything, they do beat 6 month old Opus, which we have no reason to believe it was smaller than the latest version.

johnnyApplePRNG 2mo ago

If Fable is seriously around 10T and Kimi K3 sidles up to it at 2.4T That would be extremely surprising and a massive blunder by Anthropic in model design architecture ... which I highly doubt to be the case.

nl 2mo ago
In real world comparisons K3 is somewhere between Sonnet and Opus. Fable is just a completely different (higher) level. The long tail of tasks and queries is where you see the difference.