I measured Apple's on-device LLM across an OS beta cycle
Engineering notesI measured Apple's on-device model so you don't have toJuly 28, 2026 · Kaloyan LachezarovThis is a living post. The corpus reran on every iOS 27 beta, on the release candidate, and on the public build. Last updated September 14, 2026, launch night: the public build (24A437) is newer than the release candidate and carries a different model - quieter on people and on dated sentences - and the corpus caught it within hours: raw 43 percent, final 82, restraint 34 of 35.
- ▪Engineering notesI measured Apple's on-device model so you don't have toJuly 28, 2026 · Kaloyan LachezarovThis is a living post.
- ▪The corpus reran on every iOS 27 beta, on the release candidate, and on the public build.
- ▪Last updated September 14, 2026, launch night: the public build (24A437) is newer than the release candidate and carries a different model - quieter on people and on dated sentences - and the corpus caught it within hours: raw 43 percent, f
Hacker News (AI / LLM) files mainly under ai. We currently carry 4,949 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Deforget |
| Canonical URL | https://www.deforget.app/blog/apple-on-device-model-measured |
| Publication time | Tue, 15 Sep 2026 09:50:10 +0000 |
| Retrieval time | 2026-09-15T10:06:52.946Z |
| Last seen | 2026-09-15T10:06:52.946Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | djPtBkZB_qcs · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Engineering notesI measured Apple's on-device model so you don't have toJuly 28, 2026 · Kaloyan LachezarovThis is a living post. The corpus reran on every iOS 27 beta, on the release candidate, and on the public build. Last updated September 14, 2026, launch night: the public build (24A437) is newer than the release candidate and carries a different model - quieter on people and on dated sentences - and the corpus caught it within hours: raw 43 percent, final 82, restraint 34 of 35. The gate still passes.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Deforget.
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