Half Marathon World Record Shattered: Kejelcha Runs 56:51
Image: AI-generated editorial illustration — Chronicle.
The half marathon world record changed hands again on August 23, 2026, when Ethiopia's Yomif Kejelcha stopped the clock at 56:51 at a World Athletics road race in Buenos Aires, Argentina. According to World Athletics, the performance took 29 seconds off the previous mark of 57:20, set by Uganda's Jacob Kiplimo in Lisbon in February 2025. It was one of the most startling results in modern road running, and it returned a famous record to the athlete who once owned it.
In this report, Chronicle breaks down exactly what happened in Buenos Aires and why the run matters far beyond one morning in Argentina. You will find the arithmetic behind 56:51, the story of how this record has swung between Kejelcha and Kiplimo, the course and conditions that shaped the day, and the women's world record that still stands from 2021. We have also gathered the key quotes and the questions the new mark now raises.
Table of Contents
- Kejelcha Regains the Half Marathon World Record in Buenos Aires
- Who Is Yomif Kejelcha
- The Math Behind 56:51
- A Record That Has Changed Hands Twice
- Why Buenos Aires Delivered a Record Course
- The Women's Half Marathon World Record
- What Comes Next for the Distance
- Key Takeaways
- Frequently Asked Questions
- Sources
- Read Next on Chronicle
Kejelcha Regains the Half Marathon World Record in Buenos Aires
On August 23, 2026, Yomif Kejelcha crossed the line in 56:51 at a World Athletics road race in Buenos Aires, the capital of Argentina. The governing body's own report framed the story in a single word that captured the moment perfectly: "regains." Coverage followed within hours from BBC Sport, Olympics.com, and The New York Times and The Athletic, all reporting the same headline number from the same course on the same morning.
The scale of the improvement is what made the run extraordinary. Kiplimo's 57:20, set in Lisbon in February 2025, had stood for roughly eighteen months as one of the sport's most intimidating benchmarks. Kejelcha did not chip away at it; he removed 29 seconds in a single performance, a margin that would represent a career-defining leap for almost any elite runner over any distance. In the half marathon world record 2026 conversation, this is the run that everything will now be measured against.
"I had planned to run conservatively over the early stages, but I felt good," Kejelcha said in comments reported by Run247 the following day. The quote, fragmentary as it is, hints at the anatomy of the performance: patience in the opening kilometres, then a sustained push that the previous record was never asked to withstand. Full split data was still being parsed by analysts as reports filtered out of Argentina.
56:51 — the new half marathon world record, 29 seconds faster than the 57:20 that Uganda's Jacob Kiplimo ran in Lisbon in February 2025. (World Athletics, August 23, 2026)
Who Is Yomif Kejelcha
From Track Specialist to Road Record Holder
Yomif Kejelcha is an Ethiopian distance runner who spent the first phase of his career building a reputation as one of the most versatile men on the track before committing more fully to the roads. According to Olympics.com, he is a two-time Olympian who has represented Ethiopia at the highest level of the sport. That pedigree matters, because the half marathon rewards the same blend of speed, endurance, and tactical patience that track racing builds over years of competition.
The "regains" framing from World Athletics tells the rest of the story. Kejelcha had held the half marathon world record before Kiplimo took it, which means the Ethiopian has now stood at the top of the distance twice, separated by a rival's long interruption. Few records in athletics carry that kind of narrative weight; fewer still change hands in both directions between two of the fastest distance runners of their era.
For Ethiopian fans, the record also restores national pride in a distance that has been contested fiercely between East African rivals for years. For Kejelcha personally, it validates the road-focused phase of a career already marked by Olympic appearances and years of track excellence. And because distance runners often peak on the roads later than on the track, there is every reason to believe the new mark may not be his ceiling.
The Math Behind 56:51
Numbers make records tangible, so it is worth translating 56:51 into everyday running terms. The half marathon is officially 21.0975 kilometres, or 13.1 miles, and Kejelcha covered that distance in 3,411 seconds. That works out to an average pace of roughly 2 minutes 42 seconds per kilometre, about 4 minutes 20 seconds per mile, and an average speed of around 22.3 km/h — sustained for more than 56 minutes without a break.
| Benchmark | Figure |
|---|---|
| Distance | 21.0975 km (13.1 miles) |
| Finishing time | 56:51 |
| Average pace per kilometre | ~2:42 |
| Average pace per mile | ~4:20 |
| Average speed | ~22.3 km/h |
| Previous world record | 57:20 (Jacob Kiplimo, Lisbon, February 2025) |
| Improvement | 29 seconds |
To put that pace in context, a runner holding 2:42 per kilometre would sweep past most recreational marathoners while covering only half their distance. Elite marathoners race at broadly comparable speeds for roughly twice as long, which is why the half marathon has become the place where the sport's raw speed over ground gets measured. The arithmetic also shows why every second counts: over 21.0975 kilometres, one second per kilometre is worth about 21 seconds on the clock.
Sustained average pace of roughly 2:42 per kilometre for 21.0975 kilometres — that is the plain-arithmetic summary of the Kejelcha half marathon record set in Buenos Aires.
A Record That Has Changed Hands Twice
The half marathon world record has become the most volatile mark at the top of the sport. Kiplimo ran 57:20 in Lisbon in February 2025, and that time stood for about a year and a half — an eternity in the current era, where carbon-plated shoes and scientific pacing have compressed record cycles across road racing. When Kejelcha stepped to the start line in Buenos Aires, the benchmark was recent, official, and widely assumed to be safe for years to come.
Instead, the Ethiopian removed nearly half a minute. World Athletics' choice of the word "regains" was precise: Kejelcha had owned the record before Kiplimo lowered it, making the Buenos Aires run the second chapter of a two-man tug-of-war over 21.0975 kilometres. Records that change hands between genuine rivals tend to keep moving, because the loser has both the blueprint and the motivation to respond.
What happens next is unknown, but the pattern of the rivalry suggests the story is not finished. Kiplimo now trails a record that was recently his, and the Ethiopian-Ugandan duels over this distance have repeatedly produced breakthroughs. Whether the response comes in Lisbon, Valencia, or another fast course, the sport has learned over the past two years to treat any standing half marathon mark as temporary.
Why Buenos Aires Delivered a Record Course
Course and conditions always shape record attempts, and Buenos Aires offered a plausible recipe. The Argentine capital is known for fast, flat road courses, and the race was part of the World Athletics road-race calendar, giving it the organization and competitive structure that record attempts require. August is also mid-winter in the Southern Hemisphere, and cool conditions are generally considered favourable for sustained hard running.
None of that diminishes the performance; it simply explains the environment in which it happened. Every world record on the roads is set somewhere flat, somewhere cool, and somewhere well organized, because elite running long ago became a science of marginal gains. What distinguishes Kejelcha's run is the size of the gain, not the existence of favourable conditions — every previous record-holder enjoyed those in their own way.
It is also fair to note, as analysts of the sport frequently do, that the modern era of super shoes and optimized race strategy has made big leaps more possible than they once seemed. How much any single factor — footwear, pacing, weather, or raw talent — contributes to a specific result is impossible to isolate. The record book records only the time, and the time is 56:51.
The Women's Half Marathon World Record
The women's benchmark provides a useful counterpoint, because it has shown none of the men's record volatility. Letesenbet Gidey of Ethiopia ran 1:02:52 at the Valencia Half Marathon on October 24, 2021, and that time remains the world record as of 2026, according to World Athletics' all-time lists. Gidey, one of the outstanding distance runners of her generation, set the mark in the same Spanish city that has become synonymous with fast road times.
Valencia's role in the record conversation is worth pausing on. The city's flat, fast courses and reliable autumn weather have made it a preferred destination for record attempts, in much the same way that record-friendly venues have shaped every era of the sport. The difference in the women's race is simply that no one has yet run faster than Gidey did there in 2021, despite the same improvements in shoes, preparation, and fields.
If the men's record teaches anything, it is that standing marks are never as permanent as they look. Gidey's 1:02:52 has now outlasted several men's record cycles, but the depth of the women's half marathon keeps widening year after year. The next attempt could come at any major autumn race, and Valencia's organizers would surely welcome it.
What Comes Next for the Distance
The immediate future of the distance now revolves around two questions: how fast can 56:51 be beaten, and who will try first? Kiplimo, whose 57:20 was the benchmark until August 23, has the clearest motivation of anyone in the sport. Kejelcha, for his part, told Run247 that he had planned to run conservatively early in Buenos Aires and felt good doing it — a detail that, read generously, suggests there may be more to come from the new record-holder.
The longer arc concerns the distance's status within athletics. The half marathon has become the proving ground where road running tests its limits without the full fuel-cost problem of the marathon, and its records now fall with a frequency that keeps the event in headlines between Olympic cycles. For the sport's organizers, competitive volatility is a gift, and no other running event is currently delivering it as reliably.
For readers trying to understand what they watched in Buenos Aires, the simplest summary is the one the numbers provide: 21.0975 kilometres at roughly 2:42 per kilometre, a 29-second improvement on a mark that took years of progress to build. Records like that do not just make headlines; they redraw the map of what athletes believe is possible.
Key Takeaways
- Yomif Kejelcha of Ethiopia ran 56:51 for the half marathon on August 23, 2026, at a World Athletics road race in Buenos Aires, taking 29 seconds off the world record (World Athletics).
- The previous record of 57:20 was set by Uganda's Jacob Kiplimo in Lisbon in February 2025.
- World Athletics framed the result as Kejelcha "regaining" the record he had previously held before Kiplimo took it.
- The time equates to an average pace of roughly 2:42 per kilometre, or about 4:20 per mile and 22.3 km/h, over 21.0975 km.
- Kejelcha is a two-time Olympian (Olympics.com) and told Run247 he had planned to run conservatively early but felt good.
- The women's half marathon world record remains 1:02:52, set by Letesenbet Gidey in Valencia on October 24, 2021.
Frequently Asked Questions
What is the half marathon world record now?
The men's half marathon world record is 56:51, set by Ethiopia's Yomif Kejelcha on August 23, 2026, at a World Athletics road race in Buenos Aires, Argentina. World Athletics, BBC Sport, and Olympics.com all reported the mark on the day it was set.
What pace is a 56:51 half marathon?
A 56:51 half marathon corresponds to an average pace of roughly 2 minutes 42 seconds per kilometre, or about 4 minutes 20 seconds per mile. That is an average speed of approximately 22.3 km/h sustained over the full 21.0975 km distance.
Who held the record before Kejelcha?
Uganda's Jacob Kiplimo held the record with 57:20, set in Lisbon in February 2025. Kejelcha had previously held the world record himself before Kiplimo took it, which is why World Athletics described the new mark as a regained record.
What is the women's half marathon world record?
The women's world record is 1:02:52, set by Ethiopia's Letesenbet Gidey at the Valencia Half Marathon on October 24, 2021. It remained the standing mark as of 2026, according to World Athletics all-time lists.
How far is a half marathon?
A half marathon is 21.0975 kilometres, or 13.1 miles — exactly half the marathon distance. It is one of the fastest-growing participation distances in running because it offers a genuine endurance challenge without the recovery demands of a full marathon.
Is Yomif Kejelcha an Olympian?
Yes. According to Olympics.com, Kejelcha is a two-time Olympian who has competed for Ethiopia at the Olympic Games, in addition to his achievements on the track and on the roads.
Sources
- World Athletics — worldathletics.org, August 23, 2026: report on Kejelcha regaining the world half marathon record in Buenos Aires.
- Olympics.com — August 23, 2026: coverage of the 56:51 run and Kejelcha's Olympic career.
- BBC Sport — bbc.com/sport, August 23, 2026: race report from Buenos Aires.
- The New York Times / The Athletic — nytimes.com, August 23, 2026: reporting and analysis of the record performance.
- Run247 — run247.com, August 24, 2026: comments from Yomif Kejelcha on his record run.
