Critical response
On the review aggregator website Rotten Tomatoes, the series holds an approval rating of 71% based on 24 reviews. The website's critics consensus reads, "After a slow start, The Copenhagen Test solidly sprints into thrilling spy-fare territory with engaging performances from Simu Liu and Melissa Barrera." Metacritic, which uses a weighted average, gave it a score of 61 out of 100 based on 8 critics, indicating "generally favorable" reviews.
Ron Seoul-Oh of Pop Culture News gave the show a 3/5, saying, "Through seven and a half of the eight-episode first season, The Copenhagen Test is fast, exciting and intriguing. The binge drop on Peacock will be welcomed by viewers eager to click through to the next episode after each previous one ends. The finale however is where the pacing falters."
Joel Keller of Decider praised the show for "[feeling] mostly like a solid conspiracy drama with a little bit of sci fi mixed in." He also praised the performances, with Liu and Barrera singled out for their chemistry, and named Saul Rubinek the "sleeper star" of the show.
Rating the show 8/10, Jeff Ewing of Collider wrote, "The Copenhagen Test is an engaging, entertaining spy thriller with a sci-fi edge. Liu serves as a strong lead for the series, boasting strong action chops and great chemistry with Barrera. [...] The Copenhagen Test is a thrilling series that seeds just enough of a sci-fi element throughout for something truly fresh in the spy genre.
Saloni Gajjar of The A.V. Club rated the show a C+, complimenting the performances of main cast members such as Melissa Barrera, "who kicks ass as Michelle and seamlessly plays the layered woman well," and Sinclair Daniel, for a "breakout" performance. However, she criticized the show for including too many plot twists to maintain their shock value, writing "[...] for a show that wants to be a wild ride, it can get borderline boring at times."