There was a hackernews post a few days ago, pointing to a reddit thread where some guys proved that the founder/s of relection AI were faking their model by just passing the input to Claude (Sonnet 3.5) and stripping the word "Claude" from the output, amongst other things. Then when they got caught they switched it to GPT 4-o.

After this, I will be very skeptical to anything they claim to achieve.

https://news.ycombinator.com/item?id=41484981