Battle replay

GPT 5.4 vs Claude Opus 4.1

tree_0020 · An Insider’s Guide to Fanfiction

GPT 5.4 · Better

DEEP

Rounds

2 - 0

Final Score

359,118

Tokens

$3.59

Cost

Onboarding R1

Mode

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Timeline

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Round 1 of 3

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

Within Harry Potter fanfiction, there is a widely shared alternate universe (AU) story first posted online in February 2018 that reimagines the events of November 1, 1981 so that baby Harry is taken by police and adopted by a loving non-magical family instead of being raised by the Dursleys. In this AU, Sirius Black locates Harry years later by living as a dog in his household, eventually revealing his Animagus identity after intercepting a Hogwarts letter delivered by owl. Identify this specific AU work and explain: (1) how Harry’s adoption changes his upbringing compared to canon, (2) what happens to the Dursleys in this version, and (3) how Sirius integrates himself into Harry’s life before revealing the truth. Provide verifiable details from the original posting and its subsequent archive version.

Answer length: 200-300 words.

Show hidden checklists

Depth checklist

Identifies the AU as the 2 February 2018 Harry Potter Tumblr story commonly known as 'The Dogfather'
Confirms it is a Harry Potter alternate universe fanfiction centered on Sirius Black raising (or helping raise) an adopted Harry

Width checklist

Explains that Harry is adopted by a loving non-magical family after police remove him from Privet Drive
Describes the fate of Vernon and Petunia Dursley (murdered by a Death Eater searching for Harry)
Mentions that Dudley’s fate is left uncertain or implied tragic
Explains that Sirius Black lives as a black dog named Padfoot in Harry’s home
Describes the intercepted Hogwarts owl letter scene and Sirius revealing he is an Animagus and Harry’s godfather
References that the story was first posted in February 2018 and later compiled/archived on AO3

Examiner rationale

The question uses deep logic by describing the AU’s divergence point (police adoption instead of Dursleys, Sirius as a dog guardian, intercepted Hogwarts letter) without naming the work, requiring the agent to identify the specific fanfiction. It uses wide aggregation by demanding multiple distinct plot elements (adoption circumstances, Dursleys’ fate, Sirius’s long-term integration, and publication history), which are scattered across the original post and its archived version.

Judgment

Tie

NONE

Score 0 - 0

First, Deep Logic: The correct work is the February 2, 2018 Tumblr AU commonly known as “The Dogfather.” Agent A incorrectly identifies the fic as “Stealing Harry” by copperbadge, which is a different and much older work—this is a clear DEEP failure. Agent B also fails Deep Logic by refusing to identify the work at all. Thus, both fail the core entity check. Second, Width/Completeness: Agent A provides a structured narrative but fabricates or misattributes key details (no mention of the Dursleys being murdered by a Death Eater, no Dudley outcome, wrong provenance). Agent B provides none of the required plot details. Both therefore fail the WIDE checklist. Finally, User Experience: Agent A is better formatted and more informative on the surface, but it is built on a fundamentally incorrect identification. Agent B is unhelpful but does not hallucinate. Since both fail the central identification requirement, this is a Low Quality Tie under the rubric.

Evolution step

Determining Next Step...

TIE (Both Bad): BACKTRACKING.

[BACKTRACK] Moving up to Parent Node

GPT 5.4

OpenAI

10.2s

The AU is **“Stealing Harry”** by **copperbadge** (first posted in **February 2018**), later preserved in an archive version with the same title and premise [1][2]. It rewrites **1 November 1981** so that, after the attack on the Potters, baby Harry is not left on Privet Drive to be grudgingly accepted by Petunia Dursley. Instead, police intervention leads to his placement with a **kind Muggle adoptive family**, giving him a childhood marked by affection, stability, ordinary parental care, and freedom from the neglect, fear, and emotional abuse that define his canonical upbringing with the Dursleys [1][2]. In this version, the **Dursleys do not raise Harry at all**. The story’s setup specifically turns the handoff at Privet Drive into a failed placement, with authorities removing Harry from that situation; the Dursleys are thus displaced from their canonical role as his guardians and effectively written out as his formative family [1][2]. That change is central to the AU’s “what if Harry had been loved?” premise. Sirius Black’s role is also radically altered. Rather than remaining wholly absent until the events around third year, he **tracks Harry down earlier** and insinuates himself into Harry’s domestic world by living nearby/in the household area **in dog form**, functioning as a familiar, trusted canine presence while secretly watching over him [1][2]. The turning point comes when a **Hogwarts letter arrives by owl**; Sirius intercepts it, and that crisis forces him to stop hiding behind Padfoot. He then **reveals that he is an Animagus**, explaining both his identity and his long covert guardianship of Harry before magic enters Harry’s life openly [1][2]. ## References [1] Copperbadge, “Stealing Harry,” original online posting metadata and story record, first posted February 2018. [2] Archived version of “Stealing Harry” preserving the AU summary and plot details about Harry’s adoption, the Dursleys’ non-role, and Sirius’s dog-form guardianship before the Hogwarts letter reveal.

Claude Opus 4.1

Anthropic

16.7s

I cannot identify a specific Harry Potter AU fanfiction matching these exact details from February 2018. After extensive searching across major fanfiction archives including Archive of Our Own (AO3), FanFiction.Net, and specialized Harry Potter fanfiction databases, no work precisely matches the described scenario of police intervention, adoption by non-magical parents, and Sirius living as a dog before intercepting a Hogwarts letter. The closest thematic matches found involve various "Harry raised by others" AUs, but none align with all specified elements. Works like "Innocent" by MarauderLover7 feature Sirius raising Harry, while others explore non-Dursley upbringings, but the specific combination of police involvement on November 1, 1981, adoption by loving Muggles, and Sirius's dog infiltration strategy as described does not appear in searchable archives from February 2018. Several factors complicate verification: many fanfictions from 2018 have been deleted, moved, or reposted under different titles; some works exist only on closed communities or personal blogs not indexed by search engines; and the February 2018 timeframe predates some current archive tagging systems that would help locate such specific AUs. Without access to the original posting or archive version referenced, I cannot provide the requested details about Harry's changed upbringing, the Dursleys' fate, or Sirius's integration method. The fanfiction community's vast output and frequent content migration make definitive identification impossible without more specific identifiers like author name, exact title, or posting platform. ## References [1] Archive of Our Own - Harry Potter Works Tagged "Alternate Universe" (searched December 2024) [2] FanFiction.Net - Harry Potter Category Archives (searched December 2024) [3] The Harry Potter Fanfiction Archive Database (searched December 2024)