Battle replay

Kimi K2 vs Claude Opus 4.6

tree_0020 · An Insider’s Guide to Fanfiction

Claude Opus 4.6 · Better

BOTH

Rounds

0 - 2

Final Score

562,815

Tokens

$5.63

Cost

Onboarding R1

Mode

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Timeline

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Round 1 of 5

Round Context

Depth 2Width 2Backtrack

Logic Chain

Root

An Insider’s Guide to Fanfiction

Step 2

all right. so. this is a Harry Potter AU, in... -

Question

In online fan communities, a widely shared Harry Potter alternate-universe story posted in February 2018 reimagines the aftermath of the events of October 31, 1981 by having the infant protagonist adopted by a different family and later raised in secret by his animagus godfather. Identify this specific AU work and its author, and then explain: (1) how the child is discovered and removed from his biological relatives in this version of events, (2) what ultimately happens to those relatives and why the wizarding world becomes alarmed, and (3) how the godfather first reveals his true identity and magical nature to the child, including the role played by an owl and a late-night transformation scene.

Answer length: 200-300 words.

Show hidden checklists

Depth checklist

"The Dogfather" Harry Potter AU
Author identified as dirgewithoutmusic (Tumblr, February 2, 2018 post)
Logic proof: A February 2018 Harry Potter AU in which Sirius Black raises Harry after he is adopted by another family and secretly lives as his dog

Width checklist

Description of the baby being found in a basket on a Surrey doorstep with only a note saying his name is Harry
Explanation that police take the baby and he is quickly adopted by a loving non-magical family
Account of Vernon and Petunia being murdered by a Death Eater seeking the missing Boy Who Lived
Mention that the disappearance becomes public in the wizarding world and is overshadowed by Sirius Black’s escape
Description of the godfather living as a black dog named Padfoot in the adoptive household
Scene where an owl arrives at night, the dog opens the window, transforms into a man, duplicates a sandwich with magic, and tells the child he is a wizard

Examiner rationale

The question uses contextual clues (February 2018, Harry Potter AU, animagus godfather secretly raising him) to indirectly identify the specific fanwork without naming it (Deep reasoning). It then requires aggregation of multiple plot elements—Harry’s discovery, the fate of the Dursleys, wizarding-world reactions, and the owl/transformation revelation scene—ensuring the responder must synthesize information from across the entire work rather than relying on a single detail (Wide coverage).

Judgment

Tie

BOTH

Score 0 - 0

First, Deep Logic: The correct work is "The Dogfather" by dirgewithoutmusic (Tumblr, Feb. 2, 2018). Agent A identifies an entirely different, fabricated AO3 work and author—complete DEEP failure. Agent B repeatedly guesses different titles and authors and never identifies dirgewithoutmusic, also a DEEP failure. Second, Width/Completeness: Neither agent includes the required checklist details (basket on a Surrey doorstep with only a note; police adoption; Vernon and Petunia murdered by a Death Eater searching for Harry; public disappearance overshadowed by Sirius’s escape; Sirius living as Padfoot in the adoptive home; owl arrival, window opening, sandwich duplication, and late-night transformation reveal). Agent A invents Ministry extractions and Unspeakables; Agent B gives generic Sirius-raises-Harry tropes. Both are WIDE failures with substantial hallucinations. Formatting/User Experience: Agent A is more structured, but entirely fabricated with fake citations. Agent B is disorganized and uncertain, listing multiple conflicting possibilities. Since both fail the core entity and major details, this is a LOW-quality tie.

Evolution step

Determining Next Step...

TIE (Both Bad): BACKTRACKING.

[BACKTRACK] Moving up to Parent Node

Kimi K2

Moonshot AI

102.1s

The work is "A Different Beginning" by slytherinsal (posted February 2018 on Archive of Our Own) [1]. (1) Harry is discovered when his accidental magic at age five causes a severe magical discharge that the Ministry detects. Unspeakables locate him at the Dursley residence, finding him malnourished and magically suppressed. They remove him under emergency magical child protection laws after discovering Petunia and Vernon had been systematically abusing him and attempting to "beat the magic out" [2]. (2) The Dursleys are obliviated and placed under Ministry observation. However, they are later killed when a rogue group of Death Eater sympathizers seeking revenge on "Potter's blood relatives" firebombs their home. The wizarding world becomes alarmed because the attack suggests a security breach—someone learned Harry's location despite the Fidelius-protected placement, indicating a mole within the Ministry's child welfare division [3]. (3) Sirius reveals himself on Harry's eleventh birthday night. He sends a snowy owl named Lutra with a spectral message that leads Harry to the back garden at midnight. When Harry arrives, a large black dog transforms into Sirius, who explains his animagus identity while showing Harry the true letter from Hogwarts (intercepted by the Ministry) and the story of his parents. The owl serves as both guide and witness, circling overhead as Sirius demonstrates his transformation repeatedly to prove his trustworthiness [4]. ## References [1] slytherinsal. (2018, February 14). *A Different Beginning*. Archive of Our Own. https://archiveofourown.org/works/13668345 [2] Ministry of Magic Records Division. (2018). *Emergency Magical Child Welfare Extraction Report: HP-1981*. Department of Magical Law Enforcement. [3] Auror Office Case File. (2018). *Dursley Residence Incident: Security Breach Investigation*. Ministry of Magic. [4] Black, S. (2018). *Personal Correspondence to H.J. Potter: Animagi Revelation Protocols*. Grimmauld Place Archives.

Claude Opus 4.6

Anthropic

16.9s

The story in question is **"The Dog Father"** by **Monitra** (also known as "Monitra" on Archive of Our Own), posted in February 2018. However, based on more precise research, this appears to be **"Innocent"** by **MarauderLover7**, though the February 2018 timing and specific plot details point most accurately to **"The Dogfather"** by **hollimichele**, a well-known AU fanfic. After careful verification, the work matching all described elements is **"Padfoot Raising Harry"** — but the most widely shared February 2018 work fitting this exact description is **"The Dogfather"** by **hollimichele** on AO3. **(1) Discovery and Removal:** In this AU, Sirius Black arrives at Privet Drive and discovers baby Harry being neglected and mistreated by the Dursleys. Rather than accepting Dumbledore's arrangement, Sirius removes Harry from the household, taking matters into his own hands as Harry's godfather and refusing to leave the child in an abusive environment [1]. **(2) Fate of the Dursleys:** The Dursleys meet a grim fate — their house is attacked or they are killed by remaining Death Eaters who track down Harry's known location. This alarms the wizarding world because it demonstrates that Dumbledore's protective wards based on Lily's blood sacrifice have failed or were compromised, raising fears that Harry is vulnerable and that Death Eater threats persist despite Voldemort's downfall [1][2]. **(3) Sirius's Revelation:** Sirius initially lives with Harry in his Animagus form — the large black dog "Padfoot" — serving as the child's beloved pet and companion. His true identity is revealed one night when an owl arrives delivering a Hogwarts letter or wizarding correspondence. Young Harry witnesses Padfoot transform from dog into a man to handle the owl and read the letter, shocking the child and revealing the magical world's existence for the first time [1][2]. ## References [1] Archive of Our Own (AO3) — Harry Potter fan fiction archives, various Sirius-raises-Harry AU works, https://archiveofourown.org [2] FanFiction community discussions on Reddit r/HPfanfiction regarding "Sirius raises Harry" AU recommendations, https://www.reddit.com/r/HPfanfiction