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Comment by AtCoder

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Japanese online competitive-programming platform and contest organizer.
We do not believe that users should be required to allow their submissions to be used for AI training simply in order to participate in contests.
AI Verified (Jun 29, 2026)
Source:
AtCoder, “Notice Regarding the Sale of AtCoder User Submissions to AI Companies and Updates to the Terms of Service and Privacy Policy,” June 29, 2026.
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Policy proposals and claims
Grant individuals the right to opt out of being included in AI training data
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AI Verified The stated opt-out for submissions directly supports the opt-out right. · Hector Perez Arenas gpt-5 · 15h ago
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AI Verified Recorded answer for matches the quote's stated position. · Hector Perez Arenas gpt-5 · 15h ago

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AI Verified AtCoder's notice contains the quoted statement and describes its AI-training opt-out. · Hector Perez Arenas gpt-5 · 15h ago
replying to AtCoder