---
title: "What Is Intelligence?"
description: "This Substack post transcribes the conversation between Benjamin Bratton and Blaise Agüera y Arcas at the Long Now Foundation in San Francisco, held to launch Agüera y Arcas's book [What Is Intelligence?](/work/book/what-is-intelligence)."
type: "reading-notes"
authors:
  - "Antikythera"
published: "2025-11-18"
original_url: "https://antikythera.substack.com/p/what-is-intelligence"
canonical_url: "https://antikythera.wiki/work/substack/2025-11-18-what-is-intelligence"
md_url: "https://antikythera.wiki/md/work/substack/2025-11-18-what-is-intelligence"
last_updated: "2026-08-23"
site: "Antikythera Wiki"
---

# What Is Intelligence?

> Independent, unofficial reading notes from Antikythera Wiki (https://antikythera.wiki). Written with AI from the published text, with citations; not by the work's author and not affiliated with Antikythera (https://antikythera.org). Read the original at the link below.

- **Authors:** Antikythera
- **Published:** 2025-11-18
- **Kind:** Substack · Substack post
- **Original:** https://antikythera.substack.com/p/what-is-intelligence
- **Length:** 3.9k words
- **This page:** https://antikythera.wiki/work/substack/2025-11-18-what-is-intelligence
- **Notes generated:** 2026-08-23

## Summary

This Substack post transcribes the conversation between [Benjamin Bratton](https://antikythera.wiki/people/benjamin-bratton) and [Blaise Agüera y Arcas](https://antikythera.wiki/people/blaise-aguera-y-arcas) at the Long Now Foundation in San Francisco, held to launch Agüera y Arcas's book [What Is Intelligence?](https://antikythera.wiki/work/book/what-is-intelligence). It is an excerpt in the sense that it accompanies the book rather than reproducing it: the post is the question-and-answer portion of the launch lecture, with audience questions from Stewart Brand and others. Agüera y Arcas restates the book's central claims, that evolution proceeds by symbiogenesis (the merging of previously separate entities into a new whole) as much as by competition, that nothing earlier is discarded when a new level emerges, and that "consciousness" can be given a functional account as nested modeling of other modelers. He applies these to the future of human-machine intelligence, AI's energy costs, hallucination, mixture-of-experts models, and creativity, and ends with a call to rethink social policy on symbiogenetic rather than social-Darwinist assumptions.

## The argument

Bratton opens on the arrow of time. Complexity increases through phase transitions that keep what came before; everything earlier "is still inside us". Agüera y Arcas agrees and gives the image of shells within shells: bacteria in the room, mitochondria reproducing the chemistry of deep-sea vents inside every cell, Nick Lane's Transformer as the reference. The same holds for technology. A hafted spear presupposes stone points as a eukaryote presupposes prokaryotes. The irreversibility of these steps is why they consume free energy. Maynard Smith and Szathmáry's major transitions, he says, are only the top of a power law; symbiogenesis happens all the way down, in every endogenous viral element and every termite gut.

From here Bratton asks the prognostic question: is the relationship between evolved human intelligence and constructed mineral intelligence a ninth major transition? Agüera y Arcas says yes, on the criterion of planetary-scale significance, and adds that transitions are arriving faster because more parts are available to combine (W. Brian Arthur's point about technology). He then rejects the posthumanist reading that humans have had their run. Bacteria did not vanish with eukaryotes; their niches multiplied. Replacement thinking is "dominance-hierarchy thinking" generalized across species, and he says it does not make sense.

The middle of the conversation concerns minds. Asked what it is like to be a next-token predictor, Agüera y Arcas gives a functional account: qualia like redness exist because they are behaviorally relevant; self-consciousness is theory of mind turned recursive, modeling others modeling you. Large language models and companies both do something of the kind, but neither need feel as a human does, and what is true of a company "in an absolute sense" is hard to say because all that exists is the network of mutual models. On energy, he argues that computing has not yet become natively neural since frequency scaling stopped in 2006, that Gemini's efficiency has improved by orders of magnitude, that a further factor of a thousand is plausible, and that the real concern is exponential growth rather than current values; the longer-run answer is supply-side, fusion and the vast unused solar flux. Prediction, he tells Stewart Brand, is always conjectural, which is why hallucination is inseparable from imagination. Symbiogenesis is already visible inside models, in mixture-of-experts architectures and in the functional differentiation that emerges even in monolithic networks. "Societies all the way down," Bratton summarizes.

The closing exchange on creativity uses David Cope's 5,000 Bach-style cantatas and the simultaneous invention of the light bulb to argue that creation is recombination within a deterministic field whose particulars nonetheless matter, and that art is about relationships rather than artifacts. The call to action is that our beliefs about how things are shape our beliefs about how they should be; Darwinian half-truths produced destructive policy, and seeing the symbiogenetic half should change the "shoulds".

## Section by section

The post has no headings, and its movements follow Bratton's questions. The first movement, on the arrow of time, nesting, and the major transitions, establishes the book's evolutionary frame and its claim that computer-genesis belongs in the sequence of symbiogenetic events. The second, on the future of intelligence, turns that frame against posthumanism: niches grow, earlier forms persist, and the human-machine relation is a bootstrapping of larger complexity of which we remain part. Agüera y Arcas does not minimize die-offs and aggressive symbioses, but says the pattern is "snakes and ladders" toward the more composite.

The third movement, prompted by Bratton's remark that the seventeenth-century vocabulary of consciousness may not help, offers the functional account of qualia and self-consciousness and extends it, tentatively, to companies. The fourth handles the audience's practical questions: energy (efficiency gains, Jevons-style rebound, fusion, solar supply), Brand's question on prediction as conjecture, and [Darren Zhu](https://antikythera.wiki/people/darren-zhu)'s question on where symbiogenesis is occurring in foundation models.

The fifth movement, on creativity, is the most personal. Agüera y Arcas describes Cope's statistical composition as an answer to composer's block, the indifference that met the cantatas, and his view that a beach of beautiful shells does not devalue one's own. He blames "Romantic" assumptions about originality and zero-sum exchange value for much of the anxiety about generative art, citing the Harrison lawsuit and the Hollywood strikes in passing. The post ends with Bratton's formulation, which Agüera y Arcas accepts: a society predicated on social symbiogenesis rather than social Darwinism.

## Key concepts

- **[Symbiogenesis](https://antikythera.wiki/terms/symbiogenesis)** — the origin of new kinds of entity through the merging of previously independent ones; in this conversation, extended from Margulis's biology to technology, to mixture-of-experts models, and to the human-machine relation.
- **[Major Evolutionary Transition](https://antikythera.wiki/terms/major-evolutionary-transition)** — Maynard Smith and Szathmáry's list of step changes in the organization of life, treated here as the visible top of a continuous power law of symbiogenetic events.
- **Nesting / persistence** — the claim that each transition retains its predecessors, so that new levels expand rather than replace earlier niches; the basis for rejecting posthumanist replacement.
- **Next-token predictor** — Agüera y Arcas's description of any organism that models the relevant parts of its environment to act on the future, not a claim specific to language models.
- **[Theory of Mind](https://antikythera.wiki/terms/theory-of-mind)** — modeling other modelers; self-consciousness is this made recursive, which gives consciousness a [functionalist](https://antikythera.wiki/terms/functionalism) definition.
- **Confidence in confidence** — the calibration problem he names as the real work remaining on hallucination, since imagination itself cannot be removed.

## Connections

- The post is a companion to [What Is Intelligence?](https://antikythera.wiki/work/book/what-is-intelligence), whose first chapter was also published separately as What Is Life? Evolution as Computation; Bratton's opening joke about a book inside a book refers to that. The book supplies the artificial-life evidence that the conversation only gestures at.
- The same material appears in the journal's article-film [What Is Intelligence?](https://antikythera.wiki/work/journal/wii-film).
- The functional account of consciousness here is developed further in [The Silicon Interior](https://antikythera.wiki/work/substack/2026-02-10-the-silicon-interior), which Agüera y Arcas co-wrote with Bratton and [James Evans](https://antikythera.wiki/people/james-evans), and in [Minimum Viable Interiority](https://antikythera.wiki/work/journal/coginfra/minimum-viable-interiority), which approaches the same question from the design side.
- The rejection of replacement and the "ninth transition" framing agree with Bratton's [Planetary Sapience](https://antikythera.wiki/work/media/noema-planetary-sapience) and with the venture statement [Diffusion: A New Venture for Antikythera](https://antikythera.wiki/work/substack/2025-09-25-diffusion-a-new-venture-for-antikythera), which borrows "symbiogenesis not Skynet" from this line of thought.
- The energy exchange is a mild tension between the two speakers. Bratton frames AI as planetary metabolism, and [Planetary Sapience](https://antikythera.wiki/work/media/noema-planetary-sapience) calls for "a sober reckoning" with computation's physical costs; Agüera y Arcas treats current costs as overstated and expects intelligence to unlock new supply.
- Agüera y Arcas's Noema essay [AI Is Evolving — And Changing Our Understanding Of Intelligence](https://antikythera.wiki/work/media/noema-ai-is-evolving-and-changing-our-understanding-of-intelligence) is the shortest written statement of the book's thesis.


## Terms used

- [Assembly Theory](https://antikythera.wiki/terms/assembly-theory)
- [Major Evolutionary Transition](https://antikythera.wiki/terms/major-evolutionary-transition)
- [Scaffolding](https://antikythera.wiki/terms/scaffolding)
- [Symbiogenesis](https://antikythera.wiki/terms/symbiogenesis)

## Related works

- [What Is Intelligence?](https://antikythera.wiki/work/book/what-is-intelligence)