claude isa more realistic than gpt in my opinon

Is it only me or is Claude much more straight forward than gpt? Gpt when asking for ideas tends to agree with everything you say, even when I customize instructions not to do so, while Claude gives actual formative assesment and calls out what you say is wrong. When writing or building ideas Claude is more constructive than gpt which is just a validation magnet. I might be wrong but that's why I choose Claude over gpt