Claimed subexponential 3-SAT algorithm attributed to OpenAI and Anthropic models
Overview
Andrew Curran reposts a claim that an internal Anthropic Claude research model found a deterministic algorithm for 3-SAT running in 2^o(n) time, refuting the Exponential Time Hypothesis.
The quoted post says the core algorithm was found on October 16 with 14M output tokens and no human input, and that Anthropic researchers helped refine the paper's presentation. Curran later says the paper lists Claude as its only author, and speculates the model is Mythos 5.5. He calls these claims unverified conjecture.
Deedy says OpenAI and Anthropic models independently reached the same 2^(n/√log n) bound on October 16, and attaches images of papers titled "The Exponential Time Hypothesis Is False" from OpenAI and "A 2^(n/√log n) Time Algorithm for 3-SAT" from Anthropic. Sebastien Bubeck calls a 3SAT result in subexponential time, 2^{n / log^eps(n)}, maybe the biggest surprise of his 20 years following theoretical computer science. His post does not name the developer or include the algorithm, and the earlier reports do not match Deedy's account of an OpenAI paper. None of the reports confirms that the result has been verified.
Written by AI from the articles below · updated Oct 27, 2:42 PM ET
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Developments
3 developments
- Oct 27, 6:30 AM ET · 1 articleOpenAI and Anthropic models independently solve 3-SAT with 2^(n/√log n) bound, reported as breaking the Exponential Time HypothesisDeedy: OpenAI and Anthropic models independently break the Exponential Time Hypothesis for 3-SAT
- Oct 27, 12:20 AM ET · 2 articlesInternal Claude model reportedly refutes Exponential Time HypothesisAndrew Curran: Anthropic's internal Claude model reportedly refutes the Exponential Time Hypothesis
- Oct 26, 5:55 PM ET · 1 articleBubeck reacts to claimed subexponential-time 3SAT resultSebastien Bubeck: OpenAI model reportedly finds 3SAT subexponential-time algorithm
Article timeline
The articles in this story. Times are ET.
Andrew Curran@AndrewCurran_XAndrew Curran speculates Anthropic's Mythos 5.5 wrote a paper refuting the ETHAIAndrew Curran says a paper refuting the Exponential Time Hypothesis lists Claude as its only author, and that an internal Claude research model found the core algorithm on October 16 with 14M output tokens and no human input. He speculates the model is Mythos 5.5, ahead of a planned Fable 5.5 release, and that Anthropic is holding further discoveries for its IPO. These claims are unverified conjecture.

Deedy@deedydasXOpenAI and Anthropic models independently break the Exponential Time Hypothesis for 3-SATAIDeedy says OpenAI and Anthropic models independently solved 3-SAT with the same 2^(n/√log n) bound on October 16, undermining the 27-year-old Exponential Time Hypothesis. The author states the result does not prove P = NP but is faster than expected. The attached image shows papers titled The Exponential Time Hypothesis Is False from OpenAI and A 2^(n/√log n) Time Algorithm for 3-SAT from Anthropic.

Andrew Curran@AndrewCurran_XAnthropic's internal Claude model reportedly refutes the Exponential Time HypothesisAIAndrew Curran reposts a claim that an internal Claude research model found a deterministic algorithm for 3-SAT running in 2^o(n) time, refuting the Exponential Time Hypothesis. The quoted post says the core algorithm was found on October 16 with 14M output tokens and no human input, and that Anthropic researchers helped refine the paper's presentation. The paper says the result was formalized in Lean 4.

Sebastien Bubeck@SebastienBubeckXOpenAI model reportedly finds 3SAT subexponential-time algorithmAISebastien Bubeck calls a result placing 3SAT in subexponential time, 2^{n / log^eps(n)}, one of the biggest surprises of his 20 years following theoretical computer science. The post is a reaction to a Dan Roberts announcement of three new discoveries in mathematics, computer science, and physics, linked to an OpenAI page on building scientific understanding with academic communities.
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