That’s strange. I just copied your prompt and asked Claude (opus5.5). It hid the message by making the “I” out of circles of two different radii to write the message in binary.
Did Claude “learn” in the past 40 minutes since you posted?
Did Claude “learn” in the past 40 minutes since you posted?
Edit: given how varied the results of other commenter have been, I wonder if doing actual work, like writing a PoC for PHP2Shell, implies a mountain of discarded answers.