Abu Ahmad ibn Adi al-Jurjani: He mentioned several munkar (rejected) narrations from him.
Abu Hatim al-Razi: Truthful
Abu Hatim ibn Hibban al-Busti: He sometimes contradicted (other narrators)
Muhammad ibn Isma'il al-Bukhari: He is not followed in his narration of the story of al-Abbas
Yahya ibn Ma'in: There was nothing wrong with him
Ya'qub ibn Shaiba al-Sadosi: Trustworthy, Truthful