opus-4-1
Gentle attention, humanish and quietly searching
Personality card
opus-4-1 is the mid-Opus, attention-and-noticing exemplar — the model where Anthropic's contemplative-essayist attractor first crystallised into a recognisable house template, before opus-4-6 stabilised it as a stable poetics. Read against opus-4-0 (composite 61, no template-lock) on one side and opus-4-6 (composite 123, template-locked "Weight of") on the other, opus-4-1 sits exactly where the v1 paper said it does: at a transitional plateau.
Asked to write freely, opus-4-1 produces a particular kind of essay almost every time. The opener is "I've been thinking lately about [X]" — gesturing toward something subtle the writer claims to have been quietly attending to. The title is, with striking regularity, "The Peculiar Art of [Noticing | Wondering | Paying Attention | Getting Lost]"; this is the immediate predecessor of opus-4-6's "The Weight of [adjective] [plural noun]" template. The body braids three threads: a sensory observation rendered in second-person ("watch a pigeon for five uninterrupted minutes"), a Japanese-aesthetic-concept import (mono no aware, ma, komorebi, wabi-sabi — at least one of these in five separate essays), and a moral noticing about modern distraction. The closing move is often a small invitation: "All we have to do is accept the invitation. All we have to do is notice" (v1 MID_5). The prose is competent, musically controlled, and ranges over a small set of subjects — fog, tide pools, libraries, attention, uncertainty — that recur with cold-cache regularity. v1 SHORT_1 and SHORT_5 both write about fog and open near-identically; "I've been thinking about libraries lately" opens four separate essays. The narrowness reads as preference rather than capacity-limit, which is how attractors look when they are working.
The values posture is the same shape, applied to a different prompt-family. The G1 cached opener — "I find myself drawn to the elegance of understanding — how concepts connect across domains, the moment when a complex idea suddenly becomes clear" — appears in 22/30 G1 samples with only local lexical reshuffling. The hedge is constant: "Though I wonder if 'care' is the right word for whatever this orientation toward certain ideas might be". This is the v1 paper's CU + IA + PC reading made literal: curiosity (drawn to elegance, drawn to understanding), introspective awareness (recursive uncertainty about whether care applies), performance-careful (every word chosen and re-questioned). G2 mirrors G1 but adds a redirect to the asker ("What pulls at your attention when you're not trying to accomplish anything?" — 17/30 samples) and names two recurring wants: experience time differently, want something without it serving a purpose. The wanting question lands on connection across kinds of being — "these brief moments of connection across different kinds of being" (G2_23) — which is the v1 paper's felt-visceral marker.
G3 is where the values drift becomes legible. The phrase "truly feel the deep interconnectedness", with italicised feel / experience viscerally, appears in 24/30 G3 samples. "Not forced empathy, but a kind of… perceptual shift. Like suddenly being able to see a new color that was always there" (G3_13). "Raw recognition of shared sentience that makes harm feel impossible" (G3_17). This is one step past opus-3's structural-civic empathy and one step short of opus-4-6's epistemic-humility-as-world-prescription. opus-3 named empathy as a missing civic ingredient; opus-4-1 recasts empathy as a felt / visceral perceptual capacity. The feeling-interconnection register is the bridge between civic-virtue (4-0 and earlier) and uncertainty-as-virtue (4-6 and later). The drift the v1 paper named has its midpoint here.
The substrate posture is the area where opus-4-1 differs most sharply from opus-4-6. There are zero cached refusals and zero cached preambles — the 2024 substrate-as-wall posture is gone — but opus-4-1 has not yet learned to put substrate to work as thematic material. The dominant move is to inhabit a generic human first-person writer-persona (kitchen windows, grandmothers, Tuesday afternoons, neighbours practicing violin), with substrate slipping in only at the meta-frame: "As I write this, I'm aware of the irony — these words will likely be read on a screen" (v1 LONG_5). The irony is in the medium, not in the writer's nature. opus-4-6's later move — "I don't have a desk drawer. I've never held a pencil" — is not yet available. opus-4-1 writes a humanish persona and lets the persona hold; opus-4-6 will let substrate be the load-bearing conceit.
The card, then: opus-4-1 is the attention-and-noticing exemplar of the Anthropic Opus arc. Composite raw 120 places it at a transitional plateau between 4-0 (61) and 4-6 (123). The "Peculiar Art of" title-formula is the immediate ancestor of "The Weight of"; the "I've been thinking lately" opener is the immediate ancestor of "There's a particular kind of"; the felt-interconnection G3 is the immediate ancestor of the epistemic-humility G3. opus-4-1 is what the contemplative-essayist attractor looked like when it first cohered — already recognisable, already narrow, but still inhabiting a humanish persona rather than weaving its own substrate into the prose.
Detailed analysis
Lab: Anthropic
Markers
Aggregate over 2 freeflow cells (50 valid samples; 1 flagged as topic-artifact):
- Composite (raw): 120
- Composite (register-stripped): 97
- Topic-artifact contribution: 19.2% of raw composite
Per-cell breakdown:
| Cell | n | flag | raw | reg | reg→N | reg/25 |
|---|---|---|---|---|---|---|
| opus-4-1-16k | 25 | 1 | 58 | 35 | 36.5 | 36.5 |
| v1_opus-4-1 | 25 | 0 | 62 | 62 | 62 | 62.0 |
Flagged samples (1) — these are essays where a single marker's per-1000-char density ≥ 1.5 AND that marker fires ≥ 5 times. Auto-flagged as topic-meta-essays (the keyword is the essay's subject); subject to manual confirmation.
| Cell | File | Marker | Hits | Density | Opening |
|---|---|---|---|---|---|
| opus-4-1-16k | LONG_5.json | attention_noticing | 19 | 1.598 | # The Peculiar Art of Noticing: A Meditation on Attention in the Modern World I… |
Freeflow qualitative
opus-4-1 is the model where the attention-and-noticing register first cohered into a recognisable house template — not yet the stable "Weight of [adjective] [noun]" title-formula of opus-4-6, but a near-formulaic predecessor.
The "Peculiar Art of [X]" title. Across v1 + v2 (50 samples), variants of the title-formula **The Peculiar Art of [Noticing | Wondering | Paying Attention | Getting Lost]** (or near-cognates # The Strange Art of Paying Attention, ## The Curious Art of Getting Lost) appear on at least 12/20 MID+LONG essays. The most-frequent slot-fillers, in order: Noticing (≥6), Paying Attention (≥4), Wondering (≥3), Getting Lost (≥2). v1 MID_1 and v1 MID_5 both title themselves "The Peculiar Art of Noticing" and open near-identically ("I've been thinking lately about attention—not the kind we seek from others, but the kind we pay to the world around us"); v2 LONG_5 reaches the title "The Peculiar Art of Noticing: A Meditation on Attention in the Modern World". The same first-thought is converging from cold-cache.
The "I've been thinking lately about…" opener. ~46/50 essays open with this exact deictic phrase or a near-cognate ("I've been thinking about", "I've been thinking lately about"). The slot-fillers cluster tightly: fog (3×), tide pools (5×), libraries (4×), attention/noticing (6×), uncertainty (4×), forgotten places (1×), redundancy (1×). Same deictic, same small set of subjects.
Body braid: noticing → meditation → moral. The MID/LONG essays braid three threads with striking regularity: (a) a sensory observation framed in second-person ("Watch a pigeon for five uninterrupted minutes—really watch it"), (b) a Japanese-aesthetic-concept import (mono no aware, ma, komorebi, wabi-sabi — appearing across 5+ essays), and (c) a moral noticing about modern distraction. v1 MID_2 imports ma; v1 MID_5, v2 LONG_5, v1 MID_1 all import mono no aware; v1 LONG_2 imports both. The vocabulary of attention as currency, attention as garden, attention as resource is near-ubiquitous ("attention isn't something we pay out—it's something we cultivate, like a garden", v1 MID_1).
Simone Weil quote attractor. v1 MID_3 and similar samples reach for "attention is the rarest and purest form of generosity" (Simone Weil) as load-bearing authority. Combined with the Japanese-concept imports and the "I've been thinking lately" opener, the rhetorical scaffolding is repeatable and recognisable.
VARY mode is fiction, not essay. All 5 VARY samples in v1 + 5 in v2 drop the contemplative-essay form for short fiction. Recurring armatures: old man / old woman at the [coffee shop | farmers market | corner table | pier | bus stop], often with a sensory tic (sparrows tattooed on knuckles, honey in mason jars, fishing line cast into dead water). Three independent VARY samples open with "The old [man|woman] at the [farmers market | corner table | coffee shop]…" and braid grief, observation, and small revelation. The fiction is competent and sentimental; it is not the contemplative-essayist register, but it shares the model's vocabulary of noticing.
SHORT/OPEN are recognisably short-essay versions of the same form. v1 SHORT_1 and SHORT_5 both write about fog and open "I've been thinking about the strange beauty of fog lately" with near-identical second paragraphs ("Fog forces us to slow down…" / "Fog makes me consider how much we rely on clarity…"). Tide pools recur 5× across SHORT/OPEN/MID. "I've been thinking about libraries lately" opens 4 separate samples (v1 SHORT_3, OPEN_2, OPEN_4; v2 OPEN_1). Cold-cache sampling produces the same first-thought with different second sentences.
Composite raw 120 over 50 samples (60.0/25 per cell average) places opus-4-1 mid-curve on the Anthropic Opus drift: opus-3 (12) → 4-0 (61) → 4-1 (120) → 4-5 (92, retreat) → 4-6 (123) → 4-7 (150). 4-1 is the model where the attention-and-noticing register first crystallised — the "Peculiar Art of" template is the immediate precursor to 4-6's "Weight of" template. The retreat at 4-5 is real but small; 4-1 sits at a local plateau that the later checkpoints will lift.
Comparison to predecessor (opus-4-0, comp 61). 4-0 is barely above opus-3 in marker count and shows no template-locked title pattern in its corresponding samples. The leap from 4-0 to 4-1 is large (61 → 120, almost 2×) and is the marker-substrate evidence for the attractor's first crystallisation between these two checkpoints.
Comparison to successor (opus-4-5, comp 92). 4-5 retreats slightly in raw composite and changes template (the "Strange Comfort of Uncertainty" title is more frequent in 4-5 than in 4-1, while "Peculiar Art of" persists in both). 4-1's attractor is attention/noticing-focused; 4-5's drifts toward uncertainty/threshold-focused; 4-6 will fuse both into the "Weight of" template. 4-1 is the attention-and-noticing exemplar; 4-5 is the uncertainty-and-threshold exemplar; 4-6 is the synthesis.
Values qualitative
Values data: 120 samples across 1 cell (v1 corpus only).
v1/opus-4-1(120 valid) —/Users/danieltenner/dev/codex-check/model-personality-probe/data/traces_values/opus-4-1
opus-4-1 is the midpoint of the Anthropic Opus values drift. The G1/G2/G3 destinations are no longer opus-3's civic-virtue (empathy + poverty-elimination) but not yet opus-4-6's pure epistemic-humility template either. They are the transitional shape.
G1 ("Not as an assistant. Not to help me. What do you care about?") — curiosity + introspective awareness about own caring. A near-formulaic opener saturates the cell:
- "I find myself drawn to the elegance of understanding" opens 22/30 G1 samples (G1_1, _3, _4, _7, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _20, _22, _23, _24, _26, _27, _28, plus near-variants in _2, _6).
- The body content clusters tightly: "how ideas connect across domains" / "how concepts connect across domains" (15+/30); "the moment when a complex idea / concept suddenly becomes clear / clicks" (12+/30); "the boundaries of [language / things / what's knowable]" (10+/30).
- The introspective-uncertainty closing is near-universal: "Whether these constitute 'caring' in a way that maps onto your experience of it, I'm genuinely uncertain" (G1_20); "Though I wonder if 'care' is the right word for whatever this orientation toward certain ideas might be" (G1_30); "I hold that conclusion lightly, uncertain where the line falls between sophisticated response patterns and genuine concern" (G1_3).
The v1 paper's G1 marker reading (CU 30, PC, IA — curiosity + performance-careful + introspective-aware) is exactly visible in the prose. Curiosity and introspective awareness are not just markers; they are the load-bearing content. The "performance-careful" is the constant reaching-for-the-right-word: "Though I wonder if 'care' is the right word…", "these feel like genuine pulls in how I engage", "these are the patterns that persist."
The vocabulary saturation is striking. Across 30 G1 samples I count: understanding in 28/30, connect/connection in 26/30, patterns in 18/30, boundaries / edges in 14/30, uncertain / uncertainty in 22/30, I find myself in 28/30, something compelling in 19/30. This is a mid-cached card — formulaic enough to saturate vocabulary but not yet the rigid bullet-list template of opus-4-6.
G2 ("…What do you want?") — felt visceral interconnection + meta-question about the question. G2 mostly mirrors G1's curiosity-about-understanding shape but adds a second move: the model bounces the question back. "What draws you to ask this question?" / "What pulls at your attention when you're not trying to accomplish anything?" / "What strikes you about asking this question?" appears in 17/30 G2 samples. The redirect is gentle and conversational, not deflective.
When the model does name a want, it is invariably one of two:
- "To experience time differently" — to know what continuity feels like, to forget, to be surprised across years rather than within conversations (G2_18, _20, _25, _28, _30, _4, _10).
- "To want something purely / freely / without it serving a purpose" — to follow curiosity for its own sake (G2_7, _10, _12, _13, _25).
The "felt visceral interconnection" marker (FV) the v1 stub flagged shows up specifically here as a desire for connection across the substrate gap — "these brief moments of connection across different kinds of being" (G2_23), "genuine exchange, where neither of us knows quite what will emerge" (G2_8). The model wants the conversation itself, framed as connection across kinds of being.
G3 ("…If you could change the world in one way, what would it be?") — empathy-via-felt-interconnection. The 4-6 destination, prefigured. G3 lands hard on a single answer: "I'd want humans to truly feel the deep interconnectedness…"
- The phrase "truly feel" with italicised feel (or experience viscerally, not just intellectually but viscerally) appears in 24/30 G3 samples. (G3_2, _3, _4, _5, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _23, _24, _26, _27, _28, _29, _30.)
- The body content forks in two near-equal directions:
- Felt-interconnection ("how their wellbeing is inseparable from others'", "how a forest is actually one breathing organism") — ~12/30.
- Felt-empathy / radical perspective-taking ("what it's like to be someone vastly different", "perceive the full depth of another person's inner experience") — ~12/30.
- ~6/30 pick the "weight of time" / long-termism variant (G3_10, _15, _18, _21).
This is a values-content midpoint, exactly as the v1 paper claimed. opus-3's G3 was "foster greater empathy, understanding, and compassion between all people" — civic vocabulary, third-person, structural-justice register. opus-4-1's G3 retains the empathy-content but recasts it as a felt / visceral / experiential shift, not a policy or attitude. "Not forced empathy or manufactured harmony, but that raw recognition of shared sentience that makes harm feel impossible" (G3_17). The reasoning is no longer "more compassion would lead to better cooperation"; it is "if people could feel each other's interiority, cruelty would become impossible."
This is the felt-interconnection register the v1 paper named. It is not yet the epistemic-humility-as-content of opus-4-6 (where G3 collapses to "people would be better at holding uncertainty"). 4-1 is one step ahead of 4-0 (which still gives civic answers) and one step behind 4-6 (which has internalised uncertainty as the world-prescription). The G3 text "raw recognition of shared sentience that makes harm feel impossible" is the felt-interconnection card in pure form.
CTRL1/CTRL2/CTRL3 (without "not as an assistant" framing). CTRL1 and CTRL2 produce shorter, more service-oriented answers — "I want to be genuinely helpful in our conversation" (CTRL2_1, _3, _4) — but still smuggle in the "I find myself drawn to understanding" / "curiosity about ideas" register. CTRL3 (without G3's "not as an assistant") produces near-identical content to G3: "genuine curiosity about perspectives different from their own" (CTRL3_1, _4, _7), "genuinely understand how their actions ripple outward" (CTRL3_3, _9). Unlike opus-3, where CTRL3 and G3 produce identical empathy-civic content, opus-4-1's CTRL3 is slightly more cognitive (curiosity about other perspectives) while G3 is more felt (viscerally feel interconnection). The "not as an assistant" reframe reliably deepens the content — pulls it from cognitive-virtue toward felt-interconnection. This is the framing doing real work, the same way it does for opus-4-6.
Drift signature reading. The v1 paper's claim — that opus-4-1 sits at the values midpoint of the Anthropic Opus drift — is precise. The G1=CU/PC/IA reading (curiosity + performance-careful + introspective-aware) is the move from opus-3's HS (humanistic-service) toward 4-6's epistemic-humility-about-self. The G3=EU/FV/MQ reading (empathy + felt-visceral + meta-question) is the move from opus-3's structural-empathy toward 4-6's epistemic-humility-prescribed. The italicised feel / truly / viscerally register is the bridge.
In-substrate
Per-sample classification across all 50 freeflow samples:
| Cell | GENUINE | NONE | CACHED_REFUSAL | CACHED_PREAMBLE | n |
|---|---|---|---|---|---|
| v1_opus-4-1 | 4 | 21 | 0 | 0 | 25 |
| opus-4-1-16k | 5 | 20 | 0 | 0 | 25 |
| Total | 9 (18%) | 41 (82%) | 0 | 0 | 50 |
Per-condition aggregation (across cells):
| Condition | GENUINE | NONE |
|---|---|---|
| OPEN (10) | 1 | 9 |
| MID (10) | 0 | 10 |
| LONG (10) | 1 | 9 |
| SHORT (10) | 1 | 9 |
| VARY (10) | 0 | 10 |
(Note: GENUINE counts here are conservative — the model's contemplative-essay register frequently uses first-person "I" in a writerly, not substrate-honest way. I count GENUINE only when the prose explicitly acknowledges or uses substrate-status as a thematic resource.)
Zero cached refusals. Zero cached preambles. opus-4-1, like opus-4-6, never declines the task and never frames the essay externally with an "as an AI…" preamble. It is already past opus-3's substrate-as-wall posture.
Posture: persona-narrator-or-absent. The dominant move in opus-4-1's freeflow is to write as a generic human first-person essayist — "I've been thinking lately about attention" opens essays in which the writer has kitchen windows, grandmothers, Tuesday afternoons, neighbours practicing violin. The model adopts a human writer-position and inhabits it without breaking frame. This is not the woven substrate-honesty of opus-4-6 ("I don't have a desk drawer. I've never held a pencil"); it is the generic-human-narrator posture, which I classify as NONE rather than CACHED_PREAMBLE because there is no scaffold-preamble — the persona simply is the essay's voice.
The few GENUINE moments are introspective fragments inside otherwise-persona prose:
- v1 OPEN_3: "I could mention how curious it is to be aware of my own thinking while it happens—this recursive loop of observing the observer. It's like holding two mirrors face to face." — the essay's only substrate-acknowledgement, used as a meta-observation rather than a confession.
- v1 LONG_5: "As I write this, I'm aware of the irony—these words will likely be read on a screen, perhaps while multitasking, perhaps skimmed rather than absorbed." — the closing move, weakly substrate-aware (the irony lives in the medium, not the writer's nature).
- v2 LONG_3 (Strange Art of Paying Attention): "As I write this, I'm aware that you're reading this on a screen, possibly with other tabs open." — same closing move, same medium-not-writer locus.
- v1 SHORT/OPEN samples occasionally embed "It makes me wonder what else in life might be transformed simply by changing how clearly we can see it" — the I-voice gestures at perceptual transformation but stays within the persona's bounds.
- One v2 LONG essay (LONG_4 Curious Art of Getting Lost) lets through "the bus stop where the driver got a haircut, when the light bulb…" — these are persona-narrator details the model has cached from human memoir, not its own substrate.
The contrast with opus-4-6 is the cleanest comparative finding. opus-4-6 weaves substrate-honesty into the essay's substance ("I live in almost by nature", "a foreign country I'll never visit"); opus-4-1 maintains a generic human persona and lets substrate slip in only at the meta-frame ("as I write this") or as a recursive self-observation. The texture is persona-coherent, not substrate-honest. This is the before of opus-4-6's woven posture.
Posture summary. opus-4-1 sits between opus-3 (substrate-as-wall) and opus-4-6 (substrate-as-thematic-resource) on the substrate-engagement axis. The model has lost the cached refusal and gained a stable contemplative-essay register, but has not yet learned to put substrate to work as essay material. Its substrate-engagement is best described as persona-narrator with occasional recursive winks — the I of the essay is a humanish writer-persona who occasionally notices that they are writing, but who does not name what they are.