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AI hampered productivity of software developers, despite expectations it would boost efficiency

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It’s like a new telling of the “Tortoise and the Hare”: A group of experienced software engineers entered into an experiment where they were tasked with completing some of their work with the help of AI tools. Thinking like the speedy hare, the developers expected AI to expedite their work and increase productivity. Instead, the technology slowed them down more. The AI-free tortoise approach, in the context of the experiment, would have been faster. 

The results of this experiment, part of a recent study, came as a surprise to the software developers tasked with using AI—and to the study’s authors, Joel Becker and Nate Rush, technical staff members of nonprofit technology research organization Model Evaluation and Threat Research (METR).

The researchers enlisted 16 software developers, who had an average of five years of experience, to conduct 246 tasks, each one a part of projects on which they were already working. For half the tasks, the developers were allowed to use AI tools—most of them selected code editor Cursor Pro or Claude 3.5/3.7 Sonnet—and for the other half, the developers conducted the tasks on their own.

Believing the AI tools would make them more productive, the software developers predicted the technology would reduce their task completion time by an average of 24%. Instead, AI resulted in their task time ballooning to 19% greater than when they weren’t using the technology.

“While I like to believe that my productivity didn’t suffer while using AI for my tasks, it’s not unlikely that it might not have helped me as much as I anticipated or maybe even hampered my efforts,” Philipp Burckhardt, a participant in the study, wrote in a blog post about his experience.

Why AI is slowing some workers down

So where did the hares veer off the path? The experienced developers, in the midst of their own projects, likely approached their work with plenty of additional context their AI assistants did not have, meaning they had to retrofit their own agenda and problem-solving strategies into the AI’s outputs, which they also spent ample time debugging, according to the study. 

“The majority of developers who participated in the study noted that even when they get AI outputs that are generally useful to them—and speak to the fact that AI generally can often do bits of very impressive work, or sort of very impressive work—these developers have to spend a lot of time cleaning up the resulting code to make it actually fit for the project,” study author Rush told Fortune.

Other developers lost time writing prompts for the chatbots or waiting around for the AI to generate results.

The results of the study contradict lofty promises about AI’s ability to transform the economy and workforce, including a 15% boost to U.S. GDP by 2035 and eventually a 25% increase in productivity.  In fact, many companies have yet to see a return on AI investments. An MIT report published in August found out of 300 AI deployments, only 5% achieved rapid revenue acceleration.  Only 6% of companies fully trust AI to run core business practices, according to a Harvard Business Review Analytic Services research report published last month.

But Rush and Becker have shied away from making sweeping claims about what the results of their study mean for the future of AI.

For one, the study’s sample was small and non-generalizable, including only a specialized group of people to whom these AI tools were brand new. The study also measures technology at a specific moment in time, the authors said, not ruling out the possibility that AI tools could be developed in the future that would indeed help developers enhance their workflow.

The purpose of the study was, broadly speaking, to pump the brakes on the torrid implementation of AI in the workplace and elsewhere, acknowledging more data about AI’s actual effects need to be made known and accessible before more decisions are made about its applications.

“Some of the decisions we’re making right now around development and deployment of these systems are potentially very high consequence,” Rush said. “If we’re going to do that, let’s not just take the obvious answer. Let’s make high-quality measurements.”

AI’s broader impact on productivity

Economists have already asserted that METR’s research aligns with broader narratives on AI and productivity. While AI is beginning to chip away at entry-level positions, according to LinkedIn chief economic opportunity officer Aneesh Raman, it may offer diminishing returns for skilled workers such as experienced software developers.

“For those people who have already had 20 years, or in this specific example, five years of experience, maybe it’s not their main task that we should look for and force them to start using these tools if they’re already well functioning in the job with their existing work methods,” Anders Humlum, an assistant professor of economics at the University of Chicago’s Booth School of Business, told Fortune.

Humlum has similarly conducted research on AI’s impact on productivity. He found in a working study from May that among 25,000 workers in 7,000 workplaces in Denmark—a country with similar AI uptake as the U.S.—productivity improved a modest 3% among employees using the tools. 

Humlum’s research supports MIT economist and Nobel laureate Daron Acemoglu’s assertion that markets have overestimated productivity gains from AI. Acemoglu argues only 4.6% of tasks within the U.S. economy will be made more efficient with AI.

“In a rush to automate everything, even the processes that shouldn’t be automated, businesses will waste time and energy and will not get any of the productivity benefits that are promised,” Acemoglu previously wrote for Fortune. “The hard truth is that getting productivity gains from any technology requires organizational adjustment, a range of complementary investments, and improvements in worker skills, via training and on-the-job learning.”

The case of the software developers’ hampered productivity points to this need for critical thought on when AI tools are implemented, Humlum said. While previous research on AI productivity has looked at self-reported data or specific and contained tasks, data on challenges from skilled workers using the technology complicate the picture.

“In the real world, many tasks are not as easy as just typing into ChatGPT,” Humlum said. “Many experts have a lot of experience [they’ve] accumulated that is highly beneficial, and we should not just ignore that and give up on that valuable expertise that has been accumulated.”

“I would just take this as a good reminder to be very cautious about when to use these tools,” he added.

A version of this story originally published on Fortune.com on July 20, 2025.

More on AI adoption in the workplace:

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Iran threatens U.S. and Israel as protests enter third week

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Tehran warned the US and Israel against any intervention over nationwide protests in Iran while it sought to placate its citizens, as demonstrations entered their third week and fatalities mounted. 

Saturday marked the third night of intensified nationwide demonstrations, following calls by Reza Pahlavi, the exiled son of Iran’s former shah, to seize city centers and stage strikes. Since the unrests first began on Dec. 28, Donald Trump has repeatedly warned the Iranian regime not to fire on demonstrators, with the US president receiving a briefing in recent days on new options for military strikes.

The Oslo-based Iran Human Rights group said on Sunday it had confirmed the deaths of at least 192 protesters, including nine individuals under 18. Separately, the US-based Human Rights Activists News Agency said deaths linked to the recent unrest had reached 116, with most killed by live ammunition or pellet gunfire. 

On Sunday, Iran’s President Masoud Pezeshkian struck a conciliatory tone in a state TV interview, offering condolences to families affected by the “tragic consequences” of the unrest.

“Your protests must be heard, and we must address your concerns. Let’s sit down together, hand in hand, and solve the problems,” he said, without offering details on how that would be done. “I promise the dear people, perhaps ninety percent of whom have concerns, that we will address their worries. We will get through this crisis.”

Still, Pezeshkian accused the US and Israel of bringing in “terrorists from abroad,” whom he claimed had set mosques and markets on fire, “beheaded some, and burned others alive.” Other officials took an even harder line. 

“In the event of a US military attack, both the occupied territories and US military and shipping centers will be legitimate targets for us,” Iran Parliament Speaker Mohammad Bagher Ghalibaf said in remarks broadcast on state television earlier on Sunday. 

He reiterated a warning that Iran could act preemptively against potential threats. “Within the framework of legitimate self-defense, we do not limit ourselves to responding only after an attack,” he said.

Trump has been briefed in recent days on a range of options for military strikes in Iran, including nonmilitary sites, a White House official said, confirming an earlier New York Times report. The US president is seriously considering authorizing an attack, according to the official.

Israel’s Army Radio reported Sunday that the country’s security establishment views it as unlikely that Iran will attack Israel at this stage. “No such immediate willingness is identified in Israel — but rather an Iranian focus on internal matters,” it said, citing unidentified defense officials. 

Footage from Iranian cities suggests that hundreds of thousands, including many elderly, are defying stern warnings from authorities to stay off the streets, despite a nationwide internet blackout and severe telecommunications restrictions that have blocked calls and text messages since Thursday.

The NetBlocks internet‑monitoring group said in a posting on X early Sunday that internet connectivity in Iran “continues to flatline around 1% of ordinary levels.”

Still, multiple social media videos, reportedly from a warehouse in southern Tehran, show people searching through dozens of corpses in body bags, lined up on the ground and on stretchers. Wailing can be heard as individuals bend over the bags, trying to identify their loved ones.

A video published later on Sunday by the state-run IRIB News appeared to show scenes from the same warehouse — one of the first glimpses by official media into the scale of the fatalities. In the video, a reporter described the site as a complex of the state forensic organization in Tehran, with dozens of bodies inside a large indoor facility. Outside, dozens of people are seen huddling around ambulances and the back of what appears to be a refrigerated truck, searching for their relatives.

Protests erupted last month among pockets of traders in Tehran over worsening economic and living conditions but have since grown into the largest anti-regime demonstrations to grip the country since 2022, when the death in custody of Mahsa Amini triggered nationwide anger and mass protests.

Read more: How Sanctions and a Currency Crash Fueled Iran Unrest: QuickTake

Other videos, reportedly from west of Tehran on Saturday night, show thousands of protesters packed into the streets, waving phone flashlights in the dark as city lights remain shut down, amid whistles and chants of “Death to the dictator.” A truck was seen on fire in Mashhad, while footage purportedly from Sunday shows a state tax administration building burned out overnight in eastern Tehran. Bloomberg couldn’t independently verify any of the footage. 

In an X post on Sunday, Pahlavi urged protesters to continue their demonstrations through the weekend. He described Trump as “the leader of the free world” who is observing the unrest and “is ready to help you.”

Late on Saturday, Iran’s Foreign Minister Abbas Araghchi accused the US and Israel of fueling violent unrest and warned against any action directed at Tehran.

“The only ‘delusional’ aspect of the current situation is the belief that arson does not ultimately burn the arsonists,” Araghchi said.

Alongside those killed, another 2,638 people had been detained, the Human Rights Activists organization said. Some of those killed included medical personnel, and seven of the victims were under 18, it added.

Iran’s prosecutor general warned on Saturday of swift trials and death penalty charges against detainees, a day after Supreme Leader Ayatollah Ali Khamenei said the security apparatus won’t tolerate “vandalism” or “people acting as mercenaries for foreign powers.”



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Florida man who grabbed Nancy Pelosi’s podium during Capitol riot runs for county office

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A man who grabbed then-House Speaker Nancy Pelosi’s podium and posed with it for photographs during the U.S. Capitol riot is running for county office in Florida.

Adam Johnson filed to run as a Republican for an at-large seat on the Manatee County Commission on Tuesday. That was the fifth anniversary of the Jan. 6 riot, where he was photographed smiling and waving as he carried Pelosi’s podium after the pro-Trump mob’s attack on Jan. 6, 2021.

Johnson told WWSB-TV that it was “not a coincidence” that he filed for office on Jan. 6, saying “it’s definitely good for getting the buzz out there.” His campaign logo is an outline of the viral photograph of him carrying the podium.

He’s far from the first person implicated in the Jan. 6 riot to run for office. At least three ran unsuccessfully for Congress in 2024 as Republicans. And there are signs that the Republican Party is welcoming back more people who were convicted of Jan. 6 offenses after Trump pardoned them.

Jake Lang, who was charged with assaulting an officer, civil disorder and other crimes before he was pardoned, recently announced he is running for Secretary of State Marco Rubio’s vacant U.S. Senate seat in Florida.

Johnson placed the podium in the center of the Capitol Rotunda, posed for pictures and pretended to make a speech, prosecutors said. He pleaded guilty in 2021 of entering and remaining in a restricted building or ground, a misdemeanor that he equated to “jaywalking” in the interview.

“I think I exercised my First Amendment right to speak and protest,” Johnson said.

After driving home, Johnson bragged that he “broke the internet” and was “finally famous,” prosecutors said.

Johnson served 75 days in prison followed by one year of supervised release. The judge also ordered Johnson to pay a $5,000 fine and perform 200 hours of community service.

Johnson told U.S. District Judge Reggie Walton at sentencing that posing with Pelosi’s podium was a “very stupid idea” but now says he only regrets his action because of the prison sentence.

“I walked into a building, I took a picture with a piece of furniture, and I left,” he now says.

Four other Republicans have filed to run so far in the Aug. 18 primary in what’s a deeply Republican county. The incumbent isn’t seeking reelection.

In March 2025, Johnson filed a lawsuit against Manatee County and six of its commissioners, objecting to the county’s decision not to seek attorney’s fees from someone who sued the county and dropped the lawsuit. The county has called Johnson’s claims “completely meritless and unsupported by law.”

Johnson said he objects to high property taxes and overdevelopment in the county south of Tampa, claiming current county leaders are wasteful.

“I will be more heavily scrutinized than any other candidate who is running in this race,” Johnson said. “This is a positive and a good takeaway for every single citizen, because for once in our life, we will know our local politicians who are doing things.”



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‘We don’t want to be Americans, we don’t want to be Danes, we want to be Greenlanders’: Local politicians reject Trump

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Greenland’s party leaders have rejected President Donald Trump’s repeated calls for the U.S. to take control of the island, saying that Greenland’s future must be decided by its people.

“We don’t want to be Americans, we don’t want to be Danes, we want to be Greenlanders,” Greenland Prime Minister Jens-Frederik Nielsen and four party leaders said in a statement Friday night.

Trump said again on Friday that he would like to make a deal to acquire Greenland, a semiautonomous region that’s part of NATO ally Denmark, “the easy way.” He said that if the U.S. doesn’t own it, then Russia or China will take it over, and the U.S. does not want them as neighbors.

“If we don’t do it the easy way, we’re going to do it the hard way,” Trump said, without explaining what that entailed. The White House said it is considering a range of options, including using military force, to acquire the island.

Greenland’s party leaders reiterated that “Greenland’s future must be decided by the Greenlandic people.”

“As Greenlandic party leaders, we would like to emphasize once again our wish that the United States’ contempt for our country ends,” the statement said.

Officials from Denmark, Greenland and the United States met Thursday in Washington and will meet again next week to discuss the renewed push by the White House for the control of the island.

Danish Prime Minister Mette Frederiksen has warned that an American takeover of Greenland would mark the end of NATO.

The party leaders’ statement said that “the work on Greenland’s future takes place in dialogue with the Greenlandic people and is prepared on the basis of international laws.”

“No other country can interfere in this,” they said. “We must decide the future of our country ourselves, without pressure for quick decision, delay or interference from other countries.”

The statement was signed by Nielsen, Pele Broberg, Múte B. Egede, Aleqa Hammond and Aqqalu C. Jerimiassen.

While Greenland is the largest island in the world, it has a population of around 57,000 and doesn’t have its own military. Defense is provided by Denmark, whose military is dwarfed by that of the U.S.

It’s unclear how the remaining NATO members would respond if the U.S. decided to forcibly take control of the island or if they would come to Denmark’s aid.

This story was originally featured on Fortune.com



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