62,734
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| 2018 || {{Dts|August 7}} || || Achievement || Algorithmic team OpenAI Five defeats a team of semi-professional {{w|Dota 2}} players ranked in the 99.95th percentile in the world, in their second public match in the traditional five-versus-five settings, hosted in {{w|San Francisco}}.<ref>{{cite web |last1=Whitwam |first1=Ryan |title=OpenAI Bots Crush the Best Human Dota 2 Players in the World |url=https://www.extremetech.com/gaming/274907-OpenAI-bots-crush-the-best-human-dota-2-players-in-the-world |website=extremetech.com |accessdate=15 June 2019}}</ref><ref>{{cite web |last1=Quach |first1=Katyanna |title=OpenAI bots thrash team of Dota 2 semi-pros, set eyes on mega-tourney |url=https://www.theregister.co.uk/2018/08/06/OpenAI_bots_dota_2_semipros/ |website=theregister.co.uk |accessdate=15 June 2019}}</ref><ref>{{cite web |last1=Savov |first1=Vlad |title=The OpenAI Dota 2 bots just defeated a team of former pros |url=https://www.theverge.com/2018/8/6/17655086/dota2-OpenAI-bots-professional-gaming-ai |website=theverge.com |accessdate=15 June 2019}}</ref><ref>{{cite web |last1=Rigg |first1=Jamie |title=‘Dota 2’ veterans steamrolled by AI team in exhibition match |url=https://www.engadget.com/2018/08/06/OpenAI-five-dumpsters-dota-2-veterans/ |website=engadget.com |accessdate=15 June 2019}}</ref>
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| 2018 || {{dts|August 16}} || {{w|Arboricity}} || Publication || OpenAI publishes paper on constant arboricity spectral sparsifiers. The paper shows that every graph is spectrally similar to the union of a constant number of forests.<ref>{{cite web |last1=Chu |first1=Timothy |last2=Cohen |first2=Michael B. |last3=Pachocki |first3=Jakub W. |last4=Peng |first4=Richard |title=Constant Arboricity Spectral Sparsifiers |url=https://arxiv.org/abs/1808.05662 |website=arxiv.org |accessdate=26 March 2020}}</ref>
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| 2018 || {{dts|September}} || || Team || Dario Amodei becomes OpenAI's Research Director.<ref name="Dario Amodeiy"/>
