I was made (2 months ago) a script that finds bugs in a github repo. I tested it with claude opus 4.1 and without reasoning and it resulted with high hallucinations. e.g. : "current latest next.js version is v15. v16 doesnt shipped yet. this project fails". i added context7 mcp but hallucaniton rate decreased only a small bit. if anyone wants to test it with other models, here is the link: