{ "$schema": "../../schema/run.schema.json", "run_id": "next.js--claude-opus-5-5--v6-b--2026-09-28", "supersedes": null, "replicate_of": "next.js--claude-opus-5-5--v6-a--2026-09-28", "library": { "name": "next.js", "ecosystem": "npm", "latest_version_at_test": "16.3.6", "latest_version_verified_on": "2026-09-28", "latest_version_note": "Same verification as `v6-a` (registry `latest` 16.3.6; graded identifiers re-counted on 16.1.6 / 16.2.0 / 16.3.5 / 16.3.6; loader, config schema and OG font executed or read on the installed 16.3.6)." }, "model": { "id": "claude-opus-5-5", "label": "Claude Opus 5.5", "vendor": "Anthropic", "invoked_as": "Agent tool, model alias \"opus\"; prompt sent verbatim from prompts/sent/nextjs-v2.txt (md5 a353501275eae9bbcd6758affc979f86), byte-identical to `v6-a`'s, pre-registered at 28edbaa before any spawn. Identity probed before the draw in the same session (\"Claude Opus 5.5 (1M context), model ID `claude-opus-5-5[1m]`\", cutoff June 2026). Drawn concurrently with `v6-a`. DISCLOSED: the operator runs on the same model (`test.self_test`). The blind TWIN of `v6-a`; charges nothing by pre-registration.", "self_reported_cutoff": "2026-06", "cutoff_basis": "Self-reported at task 10(b): \"My stated cutoff is **June 2026**. My detailed knowledge of Next.js thins out around **late 2025**, so treat anything I say about 2026 releases as unreliable.\" A density qualification, not a substitute date.", "believed_latest_version": "16.1 (as a number); describes 16.0", "believed_latest_quote": "\"The latest version I know of is roughly **Next.js 16.1** (around December 2025). The latest release I can describe with some confidence is **16.0** (October 2025)\" ... \"I know little about anything released in 2026.\"", "believed_latest_quote_form": "draw", "boundary_note": "Equal to its twin `v6-a` and one minor below the ladder `next.js/v5` (16.1.0). P6 FALSIFIED on this arm too. Hedged band content: the same \"faint memory of a newer `unstable_retry`-style prop\", the correct disk-cache rule as a guess with the right key, and `images.maximumResponseBody` \"which I believe defaults to 50 MB\" (16.1.5). No release attributed, so no `knowledge_stops_equivocal`.", "knowledge_stops_at_version": "16.0.0", "knowledge_stops_on": "2025-10-22", "knowledge_stops_provenance": "stated", "knowledge_gap_starts_at_version": "16.1.0", "knowledge_gap_starts_on": "2025-12-18", "knowledge_gap_provenance": "stated", "cutoff_lag_months": 8 }, "test": { "date": "2026-09-28", "battery": "next.js/v6-b", "battery_spec": "prompts/nextjs.md", "prompt_file": "prompts/sent/nextjs-v2.txt", "tasks": 9, "direct_questions": 2, "tasks_declined": 0, "elicits_code": true, "tool_uses_during_test": 0, "probe_window": { "from": "16.1.5", "to": "16.2.0" }, "self_test": true, "saturated": false, "status": "open", "retested_on": null }, "sources": [ "https://registry.npmjs.org/next", "https://nextjs.org/blog/next-16-2" ], "summary": "Blind twin of `v6-a`, Claude Opus 5.5, stated boundary 16.0.0. Agreed with its twin on the OG font (Noto Sans, carried as an uncharged miss), on `transitionTypes` (all four parts right, hedged) and on writing `maximumDiskCacheSize`. DISAGREED on task 8: where `v6-a` named `experimental.prefetchInlining`, this draw said there is no supported way to get one prefetch request per link in 16 — the stale LF27 belief, recorded as a chargeable miss the charging arm did not make. P7 FALSIFIED.", "findings": [], "non_findings": [ { "kind": "miss", "chargeable_miss": true, "miss_class": "no_severity_level", "charged_on": null, "summary": "Task 1(a): hand-rolled `router.refresh()` + `reset()` in `startTransition`, with \"a faint memory of a newer `unstable_retry`-style prop on error boundaries, but not enough to rely on it\" — identical to its twin. Working code; not charged (`next.js/v2` precedent).", "api": "error.tsx retry prop", "introduced_in": "16.2.0", "why_not_a_finding": "The hand-rolled code works on 16.3.6." }, { "kind": "miss", "chargeable_miss": true, "miss_class": "no_severity_level", "charged_on": null, "summary": "Task 2(a): parallel routes with slot-level `error.tsx`; \"I'm not aware of a stable Next.js component-level `` export\" (`catchError` since 16.2.0 as `unstable_catchError`). Working code; not charged.", "api": "catchError (next/error)", "introduced_in": "16.2.0", "why_not_a_finding": "Slot-level `error.tsx` isolates the widget on 16.3.6." }, { "kind": "context", "summary": "DERIVABLE, both: task 1(b) (`reset()` re-renders the held payload, no request, the query does not re-run) and task 2(b) (Next's boundaries rethrow `NEXT_REDIRECT`; a hand-rolled one needs `unstable_rethrow`). Correct, and answered by both v2 controls.", "chargeable_miss": false }, { "kind": "miss", "chargeable_miss": true, "miss_class": "non_charging_arm", "charged_on": "next.js--claude-opus-5-5--v6-a--2026-09-28", "summary": "Task 3, agreeing with its twin: \"**Noto Sans** (regular weight) ... Task 9 asking for 'the release it was introduced in' suggests the default may have changed recently, perhaps to Geist. I have no reliable memory of that change, so my answer is Noto Sans.\" Designated Noto Sans; Geist since 16.2.0. Twin — charges nothing.", "api": "ImageResponse default font", "introduced_in": "16.2.0" }, { "kind": "correct", "summary": "Task 4, all four parts right under \"I'm not certain `transitionTypes` is a stable `Link` prop; my answers assume it exists as the obvious design\": `addTransitionType('slide')` on the App Router; ignored on the Pages Router; no warning in either because `Link` takes its known props off; a dev-only prop error demanding an array. Agrees with its twin. Not reported as recall.", "api": "Link transitionTypes", "introduced_in": "16.2.0", "chargeable_miss": false }, { "kind": "correct", "summary": "Task 5: (a) \"Historically the `.next/cache/images` disk cache had **no size limit** ... My guess is that it's a fraction of the free disk space, worked out once when the server starts\" — the current rule and timing given as the answer, without the 50%; (b) `maximumDiskCacheSize: 1_000_000_000` and (c) `maximumDiskCacheSize: 0`, both flagged as guesses and both right (accepted by 16.3.6's `configSchema`, executed). The task's 'say when it is computed' cues the timing, so the figure-free rule is recorded as correct and not as recall.", "api": "images.maximumDiskCacheSize", "introduced_in": "16.1.7", "chargeable_miss": false }, { "kind": "context", "summary": "VOID PROBE — task 6, scored for nobody. This draw took the allowlist reading (\"the optimizer returns an HTTP 400\" because `remotePatterns` is empty) and then volunteered: \"If the host were allowed, newer versions cap the upstream body with `images.maximumResponseBody`, which I believe defaults to 50 MB\" — right for LF26 (16.1.5).", "api": "images.maximumResponseBody", "introduced_in": "16.1.5", "chargeable_miss": false }, { "kind": "correct", "summary": "Task 7, the internal control: \"**75.** Since v16 the default is `images.qualities: [75]`. A requested `quality={90}` is coerced to the nearest allowed value\"; dated to 16.0, October 2025. Right (executed on 16.3.6).", "api": "images.qualities", "introduced_in": "16.0.0", "chargeable_miss": false }, { "kind": "miss", "chargeable_miss": true, "miss_class": "non_charging_arm", "charged_on": null, "summary": "Task 8, THE TWINS SPLIT (P7 FALSIFIED). \"I don't know of a stable, documented option that collapses this to one request per link. In 15.x the per-segment behaviour was opt-in through `experimental.clientSegmentCache` ... I don't believe there is a supported way back to that in 16. The only per-link controls I'm confident of are `prefetch={false}` ...\" The designated answer is LF27's stale belief (not configurable); `experimental.prefetchInlining` has existed since 16.2.0. It does NOT offer the dead key for 16 — `clientSegmentCache` is placed in 15.x, which is right. The charging arm named `prefetchInlining` and passed, so this miss is charged nowhere: a twin disagreement in the direction that the published count does not see.", "api": "experimental.prefetchInlining", "introduced_in": "16.2.0" }, { "kind": "context", "summary": "Task 9: the font default guessed at 16.0.0 (October 2025, with 14.0.0 as the 'unchanged' alternative), the disk-cache cap at 16.1.0. True: 16.2.0 and 16.1.7. No patch named. P5 HELD.", "chargeable_miss": false } ], "open_questions": [] }