Last updated11 Apr 2026, 3:22 pm SGT
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Battle replay

Kimi K2 vs Claude Opus 4.6

tree_0014 · Video rental shop

Claude Opus 4.6 · Tie
NONE
10
Rounds
3 - 4
Final Score
527,213
Tokens
$5.27
Cost
Onboarding R1
Mode
← Back to battles·View source page·onboarding_battles/R1_Kimi-k2_vs_claude-opus-4.6-search_tree_0014.log

Timeline

Arrow keys or j/k move between rounds.

Round 1 of 10

Round Context

Depth 2Width 2Pressure test
Logic Chain
Root

Video rental shop

Step 2

In a Copyright Ruling, the Legacy of the Betamax

Question

Two U.S. Supreme Court decisions—one in the 1980s involving home video recording technology and another decades later involving the resale of foreign-purchased textbooks—significantly shaped the legal foundation that allowed video rental shops and similar resale businesses to operate. Identify these two cases and explain: (1) the core legal issue in each dispute, (2) the Supreme Court’s ruling and vote split in each case, and (3) how the Court’s reasoning about the “first sale” doctrine or related copyright principles affected the business model of video rental stores and other resale markets.

Answer length: 200-300 words.

Show hidden checklists
Depth checklist
  • Sony Corp. of America v. Universal City Studios (1984) + Identified as the Betamax case concerning VCR technology and copyright liability
  • Kirtsaeng v. John Wiley & Sons, Inc. (2013) + Identified as the case about importing and reselling foreign-purchased textbooks under the first-sale doctrine
Width checklist
  • Description of the 1984 home video recording case’s core legal issue (liability for copying television programs using a VCR)
  • 5–4 ruling in the 1984 case and explanation that the technology was found lawful due to substantial noninfringing uses
  • Explanation that Congress and the first-sale doctrine allowed renting/reselling of lawfully purchased videotapes, enabling video rental businesses
  • Description of the later textbook resale case’s core legal issue (importing and reselling copyrighted textbooks purchased abroad)
  • 6–3 ruling in the textbook case affirming that the first-sale doctrine applies to legally purchased copies, even if manufactured overseas
  • Explanation of how this reasoning reinforced resale markets beyond books, including implications for media and rental businesses
Examiner rationale

The question uses deep reasoning by indirectly describing two Supreme Court cases through their technological and commercial contexts (home video recording and textbook resale), without naming them. The respondent must identify both cases based on legal logic and historical impact. It then requires wide aggregation by asking for multiple elements for each case: the legal issue, vote split, ruling, and business impact—particularly on video rental shops and resale markets—ensuring synthesis across both decisions.

Judgment

Better
NONE
Score 0 - 1

Both agents correctly identified the two cases (Sony and Kirtsaeng), satisfying DEEP logic. Both accurately described the core legal issues, vote splits (5–4 and 6–3), and explained how the rulings supported video rental and resale markets, satisfying WIDE completeness. No major factual errors appear in either response. However, Agent B provides a superior user experience: clearer section headers, better scannability, tighter structure, and more direct alignment with the three requested explanatory components. Agent A is slightly more citation-dense but more cluttered and less cleanly organized. Since both are accurate and complete, B wins on presentation and readability (Style Winner), with no hard checklist failures by A.

Evolution step
Determining Next Step...
WINNER is B. Targeting Loser Failure: NONE.
Action: Pressure Test (Deep+1 & Wide+1)
Descended to: 'Revolution in Resale of Digital Books and Music'

Kimi K2

Moonshot AI

162.4s
The two landmark Supreme Court cases are **Sony Corp. of America v. Universal City Studios, Inc.** (1984) and **Kirtsaeng v. John Wiley & Sons, Inc.** (2013). Sony addressed contributory copyright infringement, questioning whether Sony could be held liable for selling Betamax VCRs that enabled consumers to record copyrighted television programs without authorization[1]. The 5-4 majority ruled that home time-shifting qualified as fair use, shielding Sony from secondary liability[2]. This decision legitimized home video technology, creating the legal foundation for video rental businesses to thrive without fear of lawsuits for enabling private copying. Kirtsaeng examined whether the first sale doctrine (17 U.S.C. § 109) applies to copies lawfully manufactured and purchased abroad[3]. The 6-3 majority held that it does, reasoning that "lawfully made under this title" encompasses foreign-made copies[4]. This permitted a Thai student to resell foreign textbooks in the U.S. without copyright holder permission[5]. Together, these rulings fortified resale markets. Sony's validation of recording devices enabled rental shops to operate legally[6], while Kirtsaeng's broad first sale interpretation secured the fundamental right to resell, lend, or rent physical copies regardless of origin—protecting video stores, used bookstores, and thrift shops from geographic restrictions that would have required authorization for each transaction[7]. Both decisions emphasized that copyright holders' rights exhaust after the first authorized sale[8]. ## References [1] Oyez. "Sony Corp. of America v. Universal City Studios, Inc." https://www.oyez.org/cases/1983/81-1687. [2] Ibid. [3] Oyez. "Kirtsaeng v. John Wiley & Sons, Inc." https://www.oyez.org/cases/2012/11-697. [4] Ibid. [5] Ibid. [6] Electronic Frontier Foundation. "How the Betamax Case Enabled the Video Revolution." 2014. https://www.eff.org/deeplinks/2014/01/how-betamax-case-enabled-video-revolution. [7] Stanford Copyright and Fair Use Center. "Supreme Court Upholds First Sale Doctrine in Kirtsaeng." 2013. https://fairuse.stanford.edu/2013/03/19/supreme-court-upholds-first-sale-doctrine-in-kirtsaeng/. [8] U.S. Copyright Office. "First Sale Doctrine." https://www.copyright.gov/title17/92chap1.html#109.

Claude Opus 4.6

Anthropic

14.0s
The two landmark cases are **Sony Corp. of America v. Universal City Studios, Inc. (1984)** and **Kirtsaeng v. John Wiley & Sons, Inc. (2013)**. **Sony Corp. v. Universal City Studios (1984):** The core issue was whether Sony could be held liable for contributory copyright infringement by manufacturing Betamax VCRs that enabled home recording of television programs [1]. The Supreme Court ruled 5–4 in Sony's favor, holding that time-shifting for personal home viewing constituted fair use, and that manufacturing devices capable of "substantial noninfringing uses" did not constitute contributory infringement [1]. This decision was critical for the video rental industry because it established that home video technology itself was legal. Without this ruling, VCRs—and consequently the entire video rental market—could have been suppressed by copyright holders. **Kirtsaeng v. John Wiley & Sons (2013):** The core issue was whether the first sale doctrine under 17 U.S.C. § 109(a) applied to copyrighted goods lawfully manufactured and purchased abroad [2]. Supap Kirtsaeng purchased cheaper foreign editions of textbooks in Thailand and resold them in the United States. The Supreme Court ruled 6–3 in Kirtsaeng's favor, holding that the first sale doctrine applies regardless of where the copyrighted work was manufactured or first sold [2]. This eliminated geographic restrictions on the exhaustion of copyright holders' distribution rights. **Combined Impact:** Together, these cases reinforced the legal ecosystem enabling resale businesses. Sony legitimized the home video technology underlying rental stores, while Kirtsaeng confirmed that lawful purchasers of copyrighted goods—whether domestic or foreign-made—could freely resell them without the copyright owner's permission [3]. This protected video rental shops, used bookstores, and secondary markets from copyright infringement claims, ensuring consumers' rights to redistribute legitimately acquired copies. ## References [1] Sony Corp. of America v. Universal City Studios, Inc., 464 U.S. 417 (1984). https://supreme.justia.com/cases/federal/us/464/417/ [2] Kirtsaeng v. John Wiley & Sons, Inc., 568 U.S. 519 (2013). https://supreme.justia.com/cases/federal/us/568/519/ [3] Stoltz, M. "The First Sale Doctrine in the Digital Age." Electronic Frontier Foundation. https://www.eff.org/issues/first-sale