The only one I see that thinks it is claude other than claude itself is the GLM series.
Re:Claude Fable 5
by throw10920 on Thursday June 11, 2026 @01:12AM
(#48486462)
I have screenshots of Deepseek V4 doing this too - in a non-Claude-Code harness.
They:
- hallucinate constantly
- can't follow basic instructions
- think they're Claude for some reason ;)