Fable 5 – Median thinking declined in August
Lon Lundgren@LonAfter Anthropic made Fable 5 permanently available in subscription plans, I noticed a large drop in performance. The model felt dumber, and I couldn't explain why.
- ▪Lon Lundgren@LonAfter Anthropic made Fable 5 permanently available in subscription plans, I noticed a large drop in performance.
- ▪The model felt dumber, and I couldn't explain why.
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Story provenance
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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 | X (formerly Twitter) |
| Canonical URL | https://twitter.com/Lon/status/2101793422487204027 |
| Publication time | Mon, 21 Sep 2026 16:13:57 +0000 |
| Retrieval time | 2026-09-21T16:43:49.422Z |
| Last seen | 2026-09-21T16:43:49.422Z |
| 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 | 3J2JMm4UHl3M · 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
Lon Lundgren@LonAfter Anthropic made Fable 5 permanently available in subscription plans, I noticed a large drop in performance. The model felt dumber, and I couldn't explain why. Measured five different ways, August delivered dramatically fewer thinking tokens than July.9:59 PM · Sep 20, 2026 (function (id, args) { var element = document.getElementById(id); if (!element) return; element.textContent = (function formatFullTimestamp({ timestamp, lang, timeZone }) { const date = new Date(timestamp); return `${date.toLocaleTimeString(lang, { hour: "numeric", minute: "2-digit", timeZone })} · ${date.toLocaleDateString(lang, { month: "short", day: "numeric", year: "numeric", timeZone })}`; })(args); })("_R_2umelipip8j6_", {"timestamp":1789941576000,"lang":"en","nowLabel":"Now"});…
Excerpt limited to ~120 words for fair-use compliance. The full article is at X (formerly Twitter).
Discussion
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