🚨BREAKING: Anthropic CEO Dario responds to Nvidia CEO Jensen’s open weights letter
“Anthropic has never advocated for a ban on open-weights models.”
What Anthropic DOES support:
>don’t sell powerful chips to China, crack down on smuggling
>crack down on industrial-scale distillation
>mandatory safety testing for all capable models, open AND closed
On Jensen’s letter:
Agrees:
>open weights expand access
>strengthen competition
>give customers control
Disagrees:
>that open weights necessarily help defenders more than attackers
>specifically worried about biology >“sufficiently capable models may be able to quickly weaponize pandemic-level viruses”
On distillation:
>“A blanket ban on open-weights models is neither the correct remedy nor something we have called for.”
The real target: "companies backed by an authoritarian state seeking to overtake the US at the frontier."
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GPT-5.6 Sol Ultra lost to GPT-5.5 on physics at 3× the cost!
We gave 4 models the same prompt: build three self-contained HTML5 canvas scenes with real physics demos
Prompts:
- A monster truck backflipping onto a parked car
- A stunt car jumping six buses into a brick wall
- A train derailing off a broken bridge into the water
Outputs:
GPT-5.6 Sol Ultra: 32.9K tokens, $0.33
Opus 4.8: 9.2K tokens, $0.24
GPT-5.5: 12.4K tokens, $0.11
Grok 4.5: 7.0K tokens, $0.08
Sol Ultra draws just like GPT-5.5, only with more detail and it shows clearest on the bus jump where the two look almost identical. In the other tests Sol Ultra came out worse than its predecessor and the physics really got weaker. We think GPT-5.5 took the truck flip and the train outright. With Sol Ultra you basically get GPT-5.5 with weaker physics and a nicer picture for 3x the price. Newborn Grok 4.5 failed two of the three tests and only came good on the train