{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T23:12:51Z","timestamp":1793229171117,"version":"4.5.0"},"reference-count":50,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T00:00:00Z","timestamp":1791331200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Artif. Intell."],"abstract":"<jats:p>Layered intelligence theory (LIT) specifies eight design principles for what its author terms a Deeply AI\u2014a cognitive architecture whose parameters and surrounding structure jointly instantiate the preconditions for reorganisation, reflection, and falsifiable learning. The specification is silent on how a builder without write access to those parameters might proceed. This paper reports a working reference implementation, the Clara platform, instantiating those principles over hosted frontier large language models. The reference implementation is the platform as a whole rather than any single surface: four surfaces across three substrate vendors\u2014the conversational surfaces (Clara Nexus chat and Clara Companion) on OpenAI substrate models, the reading and instrumentation layer on Anthropic substrate models, a data-sensing path on Perplexity, and an independent read-only Research seat on Claude Sonnet 5\u2014disclosed in full in \u00a72.4, of which Clara Nexus is the primary surface for the constitutional runtime. This is a reference-implementation and specification-conformance paper rather than a benchmark-driven empirical evaluation, and it makes no task-performance claim. Specification conformance, as reported here, means a traceable mapping from a published specification clause to a named runtime carrier\u2014a typed identifier, a function, or a database table\u2014inspectable independently of the author\u2019s description. The eight principles are sorted, as this paper\u2019s analytic contribution, into those describing what the model\u2019s parameters must do, which are structurally unreachable from a hosted substrate, and those describing what the surrounding architecture must do, which are implementable at the scaffold layer. For each principle, there is a record, a verdict of built at scaffold, partial, or substrate-unreachable, alongside the named runtime carrier grounding it or the gap preventing one, and the surface evidencing it. The core engineering contribution is a constitutional runtime: seven fail-closed checks enforced at prompt-composition time, before any call reaches the substrate, encoded as a single assert Constitutional invariant. Six are typed assertions over a structured candidate move, and one is a pattern-matched textual check whose error characteristics are stated rather than assumed. Perceptual control theory primitives are reported as prompt-level Companion voice discipline rather than as a runtime-enforced mechanism. The empirical evaluation of the deployed system belongs to a companion paper whose eight falsifiable predictions are enumerated in \u00a74.3.<\/jats:p>","DOI":"10.3389\/frai.2026.1936295","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T13:11:41Z","timestamp":1791378701000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Building a deeply AI over a substrate you cannot retrain: the Clara Nexus reference implementation of layered intelligence theory"],"prefix":"10.3389","volume":"9","author":[{"given":"Richard","family":"Dobson","sequence":"first","affiliation":[{"name":"Astrala Advisory Services Ltd.","place":["Paphos, Cyprus"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","DOI":"10.1093\/acprof:oso\/9780195324259.001.0001","volume-title":"How can the human mind occur in the physical universe?","author":"Anderson","year":"2007"},{"key":"ref3","first-page":"115","article-title":"Double loop learning in organizations","volume":"55","author":"Argyris","year":"1977","journal-title":"Harv. 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