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M 5.0 - 45 km SSE of Quepos, Costa Rica — coordinate stated by United States Geological SurveyM 5.3 - 126 km WSW of Alianza Cristiana, Peru — coordinate stated by United States Geological SurveyM 4.8 - Mid-Indian Ridge — coordinate stated by United States Geological SurveyM 4.7 - 164 km SSE of Isangel, Vanuatu — coordinate stated by United States Geological SurveyM 4.6 - 24 km E of Rasht, Tajikistan — coordinate stated by United States Geological SurveyM 4.8 - 86 km ESE of Isangel, Vanuatu — coordinate stated by United States Geological SurveyM 4.6 - 295 km WNW of Houma, Tonga — coordinate stated by United States Geological SurveyM 5.1 - 81 km ESE of Isangel, Vanuatu — coordinate stated by United States Geological SurveyM 5.2 - 76 km ESE of Isangel, Vanuatu — coordinate stated by United States Geological SurveyM 4.7 - 139 km NNE of Hihifo, Tonga — coordinate stated by United States Geological SurveyM 4.9 - 97 km NNE of Chitre, Nepal — coordinate stated by United States Geological SurveyM 4.9 - 54 km E of Hihifo, Tonga — coordinate stated by United States Geological SurveyM 5.2 - 123 km NNE of Ruteng, Indonesia — coordinate stated by United States Geological SurveyM 4.5 - 95 km SSW of Severo-Kuril’sk, Russia — coordinate stated by United States Geological SurveyM 4.7 - 62 km WSW of Ollagüe, Chile — coordinate stated by United States Geological SurveyM 5.3 - 26 km NW of Neiafu, Tonga — coordinate stated by United States Geological SurveyM 4.6 - 1 km NNW of Katochí, Greece — coordinate stated by United States Geological SurveyM 5.1 - South Sandwich Islands region — coordinate stated by United States Geological SurveyM 4.7 - 43 km NW of Aroa, Venezuela — coordinate stated by United States Geological SurveyM 5.3 - 51 km NNE of Ruteng, Indonesia — coordinate stated by United States Geological SurveyM 4.6 - 176 km SSE of Vilyuchinsk, Russia — coordinate stated by United States Geological SurveyM 4.5 - south of the Fiji Islands — coordinate stated by United States Geological SurveyM 5.1 - 92 km ESE of Isangel, Vanuatu — coordinate stated by United States Geological SurveyM 4.5 - 129 km ENE of Taltal, Chile — coordinate stated by United States Geological SurveyM 5.5 - southeast of the Loyalty Islands — coordinate stated by United States Geological SurveyM 4.7 - Kermadec Islands region — coordinate stated by United States Geological SurveyM 4.5 - south of the Fiji Islands — coordinate stated by United States Geological SurveyM 4.9 - Kermadec Islands region — coordinate stated by United States Geological SurveyM 5.3 - off the coast of Oregon — coordinate stated by United States Geological SurveyXi'an Stele (Jingjiao / 'Nestorian' Stele)The Luzon StraitThe Strait of MalaccaAhmedabadAksumAlexandriaAntioch on the OrontesBerlinBirminghamBostonBrasíliaBukharaCanberraCanton (historical) — modern GuangzhouCarthageChang'anChicagoConstantinopleCórdobaCuritibaDunhuangGoaHavanaIstanbulJerusalem (Old City)KashgarLisbonLiverpoolLondiniumLondonMalacca (Melaka)ManchesterManilaMarka (Merca), SomaliaMecca (Makkah)MedellínMervMoscowNew OrleansNew York CityParisPotosíRio de JaneiroRomeSamarkandSevilleShanghaiSingaporeTenochtitlanTokyoVladivostokXi'anAmboseli–Tsavo–Kilimanjaro dispersal corridorGulf StreamHumboldt (Peru–Chile) CurrentKuroshioBerlin MarathonBoston MarathonNew York City MarathonTokyo MarathonMetrocable Line K, MedellínBasque (Euskara)MalagasyAustralian Institute of Marine ScienceGreat Barrier Reef Marine Park AuthorityICOMOS (International Council on Monuments and Sites)INPE (Instituto Nacional de Pesquisas Espaciais)International Telecommunication UnionIUCN (International Union for Conservation of Nature)UNESCO (United Nations Educational, Scientific and Cultural Organization)World Health OrganizationAmboseli National ParkChobe National ParkEtosha National ParkHwange National ParkKruger National ParkMaasai Mara National ReserveOkavango DeltaAcapulcoCherbourg — transatlantic roadsteadNew York — Chelsea Piers (Piers 54 and 59)Queenstown (Cobh) — Roche's Point anchorageSouthampton — White Star Dock (Berth 44)Arctic OceanAssamCubaDarjeelingThe Fulda GapWestern Corridor and Grumeti ReservesLabrador SeaThe Moluccas (Maluku Islands)Ngorongoro Conservation Area — Western PlainsNorthern Virginia data-centre corridorOgliastra and the Nuoro highlands, SardiniaOkinawaThe Pontic–Caspian steppeSouthern Serengeti Short-Grass PlainsSouth GeorgiaTaiwanYunnanZambezi RiverThe Mediterranean Sea (Mare Nostrum)Abu Simbel temples (Nubian Monuments from Abu Simbel to Philae)Atacama Large Millimeter/submillimeter ArrayAngkorArabian Oryx Sanctuary, Oman (delisted 2007)Amazon Tall Tower Observatory (ATTO)Baikonur CosmodromeBhadla Solar ParkThe Bornholmer Strasse crossingBorobudurBottaccione Gorge, GubbioThe Broad Street pump, SohoBurgess Shale, Yoho National ParkBurj KhalifaLaunch Complex 41, Cape CanaveralCape Canaveral Space Force StationCape of Good HopeChallenger DeepChartres CathedralCheckpoint CharlieChengjiang fossil site, YunnanChichen ItzaChicxulub impact crater, YucatánChrist the Redeemer, Rio de JaneiroColosseum (Flavian Amphitheatre), RomeCongo Square, New OrleansCosta Rica Thermal DomeCromford MillDenmark Strait SillDrake PassageDresden Elbe Valley (delisted 2009)Dresser Formation, North Pole Dome, PilbaraDSS-43, Canberra Deep Space Communication ComplexDurham CathedralEdiacara Hills, Flinders RangesEko AtlanticEnewetak AtollFairview Lawn Cemetery, HalifaxFortune Head GSSP, NewfoundlandFrancevillian Basin, GabonGalápagos IslandsGalapagos RiftGare de l'Est, ParisGoldstone Deep Space Communications ComplexLaboratori Nazionali del Gran SassoGreat Pyramid of Giza (Pyramid of Khufu)Great Wall of ChinaGrytviken Whaling StationGuiana Space Centre, KourouHadrian's WallHagia Sophia, Constantinople / IstanbulHarland and Wolff shipyard, Queen's Island, BelfastHattusa (Boğazkale)The Heart's Content cable stationHome Insurance Building, ChicagoThe Iron Bridge, CoalbrookdaleIsua supracrustal belt, southwest GreenlandKamioka Observatory, Mozumi mineJohn F. Kennedy Space CenterKilwa KisiwaniKennedy Space Center Launch Complex 39ALanding Zone 1, Cape CanaveralLeptis MagnaLighthouse of Alexandria (the Pharos)LIGO Hanford ObservatoryLIGO Livingston ObservatoryBahia de Loreto National ParkMachu PicchuMadrid Deep Space Communications ComplexMarathon and the Tumulus of the AtheniansMariana TrenchMausoleum at HalicarnassusMcMurdo StationMeeting of the Waters (Encontro das Aguas)Meishan GSSP, Changxing, ZhejiangMogao CavesMoss Landing battery storage complexNevado MismiNuvvuagittuq greenstone belt, NunavikOstia AnticaSite of PalmyraThe Pantheon, RomePetraPhilae temple complex (relocated to Agilkia Island)Pikialasorsuaq (the North Water Polynya)Point ConceptionPont du GardPorthcurno cable stationRaja AmpatBasilica of Saint-DenisSalar de AtacamaSiberian Traps large igneous provinceSimplon TunnelSirkeci Terminal, IstanbulStatue of Zeus at OlympiaStegra green steel plant, BodenTaj MahalTempelhof AirportTemple of Artemis at Ephesus (the Artemision)TimbuktuTitanic wreck siteTreasury of Atreus, MycenaeTurfan oasisThe Valentia Island cable stationParanal Observatory and the GRAVITY interferometerVostok StationWaldschlösschen Bridge, DresdenWhite City StadiumWindsor CastleYaroslavsky Station, MoscowThe Red Sea cable corridorJakartaLagosManausMarseilleNusantaraSongdoKavango–Zambezi Transfrontier Conservation Area (KAZA)Chicago MarathonLondon MarathonAlphaFold Protein Structure DatabaseLagos Blue LineArctic CouncilJet Propulsion LaboratoryNgorongoro Conservation AreaSerengeti National ParkEl Niño–Southern Oscillation (ENSO)ITERJoint European Torus (JET)National Ignition FacilityAnatoliaAntarcticaWeddell SeaBayan Obo mining districtGemini North telescope, MaunakeaKennedy Space Center Launch Complex 39BLiverpool – Maritime Mercantile City (delisted 2021)MakokoNotre-Dame de ParisStonehengeVenice and its Lagoon

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A randomised trial finds experienced developers slower with AI assistance

2025-07-10 · Recorded · science

The source states this happened, and its date is not in the future. The word the source used for it is observed.

METR published a randomised controlled trial in which sixteen experienced open-source developers worked on 246 real issues in repositories they knew well — about five years of prior experience with the projects on average — using AI tools available between February and June 2025. They took 19% longer with the tools than without, and estimated afterwards that the tools had made them about 20% faster. The gap between the measured and the perceived effect is the finding that generalises furthest, because self-reported productivity gains are the evidence base for a very large share of public claims about this technology.

Source
METR (Model Evaluation and Threat Research) · METR, "Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity", 10 July 2025, https://metr.org/blog/2025-07-10-early-2025-ai-experienced-os-dev-study/ and arXiv:2507.09089; METR, "Measuring AI Ability to Complete Long Tasks", 19 March 2025; METR, "Time Horizon 1.1", 29 January 2026
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Subject
DOMAIN_CODE_GENERATION · ORG_METR · PHENOMENON_EVALUATION_DIFFICULTY
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