Sponsored by Red Bull, the “Cyborg Season ‘26” endurance marathon became the second most popular broadcast on Twitch in 2026 so far, peaking at over 646,000 concurrent live viewers, according to Streams Charts.
While Twitch is largely dominated by gaming broadcasts and more traditional IRL/chatting streams, German creator Arda Saatçi has shown that unusually high audience engagement is also possible with content far outside the platform’s norm: survival-style endurance marathons designed to push the human body to its limits.
Saatçi is one of the most recognizable creators in this niche, with his “Cyborg Season” series built entirely around the endurance aspect of the content. Previous editions took place in France and Japan, but the third installment became a true breakout hit in terms of viewership.
Read more: Arda Saatçi’s endurance marathon became Twitch’s top content in early May
What is Red Bull Cyborg Season: Ultra 600?
Cyborg Season 26: Ultra 600 was a nearly 600-kilometer endurance livestream challenge that took him from Badwater Basin in Death Valley to the Santa Monica Pier in Los Angeles over roughly four days with little sleep. Following stretches of historic Route 66 and exposed Southern California desert highways, Saatçi continuously streamed the journey while alternating between running, power-walking, recovery stops, roadside interactions, medical check-ins, and exhaustion management.
What were the viewership numbers for Cyborg Season '26?
The event was streamed from May 5 to 10, with its largest audience arriving on the final day during the closing stages of the marathon. Average viewership across Twitch and YouTube generally fluctuated in the 50,000-100,000 live viewer range, but the closer Saatçi got to the finish line, the faster the audience grew.
In the end, the Twitch broadcast peaked at 646,000 concurrent viewers, making it not only the platform’s most popular stream of May, but also the second biggest Twitch stream of 2026 so far. The only broadcast that managed to attract a larger audience, and only by a relatively small margin, was Brazilian influencer Virginia Fonseca’s livestream from Brazil’s carnival celebrations.
Perhaps the most remarkable part is that the marathon’s audience on YouTube was actually even larger than on Twitch. The final stage of the challenge attracted over 1.1 million concurrent viewers on Saatçi’s channel, making it one of the platform’s biggest livestreams of 2026 so far, even if it still falls outside the yearly top ten. By peak concurrent viewership, the stream currently ranks 19th on the platform as of May 2026.
All in all, the event can hardly be described as anything other than a major success for Arda Saatçi and Red Bull. In total, the marathon generated more than 18 million Hours Watched, surpassing the viewership of events such as Artemis II launch coverage and several top-tier esports tournaments. In addition, across less than a week, Saatçi’s Twitch and YouTube channels combined gained more than 1.1 million new followers.
