The state of the art has improved so much that for the older tasks, computers are arguably better than humans at them: https://arxiv.org/abs/1312.6082 https://

The state of the art has improved so much that for the older tasks, computers are arguably better than humans at them: https://arxiv.org/abs/1312.6082 https://arxiv.org/abs/1312.6082 So humans have to clear higher and higher hurdles to prove themselves human while the computers use the answers from the captchas to get closer to humans' capabilities.