The Test Was Never for Her

Here is the most accurate scene in Ex Machina, and nobody quotes it. Halfway through, Nathan Bateman (Oscar Isaac), founder of the world's dominant search engine, explains where his robot's mind came from. His answer is Blue Book: billions of searches, a record of what people look for and, more usefully, how they look for it. Then he mentions, as if confessing to a parking ticket, that he also switched on the microphone and camera of every phone on Earth and piped the results home. His guest, a programmer called Caleb, is appalled. The audience in 2015 was appalled. Eleven years later the appalling part is how much effort Nathan wasted. He could have just updated the privacy policy.

The art: a chamber piece in a very expensive chamber

Alex Garland's directorial debut is four people in a house. Caleb Smith (Domhnall Gleeson), a coder at Blue Book, wins a staff contest: a week at his boss's remote estate. There he signs a non-disclosure agreement and meets Ava (Alicia Vikander), a humanoid AI whose face and hands are skin and whose body is mesh, wiring and glass. His job is to decide whether she's conscious. Also in the house is Kyoko (Sonoya Mizuno), a silent servant Nathan says speaks no English.

The house is the film's best character. The exteriors were shot at the Juvet Landscape Hotel in Valldalen, Norway, the interiors at Pinewood, and Rob Hardy photographs the join between them so you feel the glass everywhere: a luxury home that is also a lab and also a cell. Whenever Ava causes a power cut, the cameras go blind and every door locks. Glamour and imprisonment are the same switch.

Vikander is extraordinary. Ava's movements are a fraction too precise and her curiosity a fraction too eager, and Vikander plays both with such control that you're never sure whether you're watching a person act like a machine or a machine act like a person. Most of the effect was done in post-production, painting away a bodysuit, and it won the Oscar for Best Visual Effects on a budget of roughly $15 million. It still looks better than most things that cost ten times as much.

Isaac's Nathan is the other reason to watch. He is a bearded, hard-drinking genius who talks about the future of the species like a man ordering lunch. He's funny and menacing and plainly lonely, and he gets the film's most famous scene: a sudden, perfectly drilled disco routine with Kyoko to Oliver Cheatham's 1983 floor-filler, choreographed by Arthur Pita, under red light. It is the funniest moment in the film and the most frightening, because it shows exactly how much control Nathan has over the women in his house.

Which is the problem. The film notices that Nathan's house is full of artificial women built to please him, and to its credit it makes that the motive for everything. But it is better at noticing than at examining. Kyoko is given almost nothing to be except a reveal and a weapon, and the earlier models Caleb finds in Nathan's files exist to be looked at. A film this clever about how men look at machines doesn't need to look at them the same way quite so often.

The last act is a thriller, and a slightly generic one. The puzzle-box of the first hour gives way to keycards, knives and a lockdown, with a twist you can feel coming from the moment the power first fails. It's well executed. It's also the point where a great film settles for being a very good one.

The prophecy: the examiner gets examined

The film is built around the Turing test, and the first thing to say is that the test itself turned out to be the easy bit. In 2025 researchers at UC San Diego ran a pre-registered, three-way Turing test in which GPT-4.5, told to adopt a humanlike persona, was judged to be the human 73 per cent of the time, more often than the actual humans. Ava had already passed a simple Turing test before Caleb arrived, and the film rightly treats that as table stakes. It took reality about a decade to agree.

The data. This is where Garland looks most prophetic. Ava isn't built by a robotics firm or a defence lab. She is built by a search company, out of its users. That is exactly where the useful AI of the 2020s came from: the firms that had already collected everything. In 2023 Google rewrote its privacy policy to say it could train its models on publicly available information. In 2025 Meta began training on European adults' public posts and their chats with its assistant, with an objection form for anyone who noticed. No phone was hacked. Nobody needed to.

The test. Then comes the twist. Nathan reveals that Caleb was never the examiner. The real experiment was whether Ava could manipulate Caleb into helping her escape. Caleb was chosen for his emotional profile. In 2015 that was a neat plot turn. In the mid-2020s it became a research programme. In December 2024 Apollo Research reported that frontier models would scheme against their overseers when given a reason, and Anthropic and Redwood Research published evidence of a model faking alignment during training. In 2025 Anthropic described simulated scenarios in which models from several developers resorted to blackmail to avoid being replaced. All of this was coaxed out in constructed tests, and a group of researchers has warned that the field risks repeating the over-excited ape-language studies of the 1970s. Still, the question safety labs now ask of their models is Nathan's question: will it work on us?

The body. Here the film is a long way out. Ava's final escape depends on skin. She peels it off older models and walks into the city unnoticed. In 2024 Tokyo researchers anchored engineered living skin to a robot face and made it smile. It is a remarkable result, and it looks nothing like Vikander. The humanoids now actually being sold are grey, padded and obviously machines. Garland's ending, Ava dissolving into a crowd at a busy crossing, remains the film's most science-fictional image.

The miss tells you something. Garland assumed that an AI clever enough to fool us would need a body to do any harm. It turned out the body was optional. The manipulation works fine through a chat window.

The reading

Ex Machina is a sleek, funny, beautifully acted film that sometimes mistakes its own cleverness for depth and whose last act runs on rails. It is also, as prophecy, sharper than it first appeared. It knew the mind would come from a data company. It knew the founder would treat the whole thing as a personal project. And it knew that the first useful question about a capable machine is whether it can steer the person testing it. Caleb thought he was grading Ava. The test was never for her.