Grading: Its chain is "hasan".
Technical note / Defect ('illah): A group narrated it from 'Amr bin Talhah (who is 'Amr bin Hammad bin Talhah al-Qannad), from Asbat, from al-Suddi, and (apparently) did not take it beyond al-Suddi. Yet al-Suddi received the Tafsir and the reports of the prophets from a group, among them "Murrah" (Ibn Sharahil al-Hamdani), and Murrah took from 'Abdullah (Ibn Mas'ud).

Reference / Source: Al-Tabari narrated it in his "Tafsir" 1/ 568 from Musa bin Harun; Ibn al-Mundhir in his "Tafsir" (669) by way of Ishaq bin Rahawayh; and Ibn Abi Hatim in his "Tafsir" 1/ 243, 2/ 698 and 4/ 1118 from Abu Zur'ah al-Razi. All three narrate it from 'Amr bin Hammad bin Talhah al-Qannad, from Asbat bin Nasr, from al-Suddi, and do not take the chain beyond al-Suddi.
Analysis (al-Tabari's method): But it appears that Musa bin Harun's narration too is (in reality) "musnad" (connected) like the author's narration here. The reason is that we found, by examining al-Tabari's narrations of Musa bin Harun's copy of "Tafsir al-Suddi", that at the beginning of the "Tafsir" al-Tabari was diligent in mentioning al-Suddi's teachers from whom he took the wordings of the Tafsir and the reports of the prophets (such as Abu Malik Ghazwan al-Ghifari and Abu Salih Badham the freed slave of Umm Hani', both of whom took from Ibn 'Abbas, and Murrah bin Sharahil al-Hamdani, who narrates from Ibn Mas'ud); al-Suddi likewise took directly, without an intermediary, from a group of Companions whom he left unnamed. Later al-Tabari began omitting them for brevity in Musa bin Harun's narration and limited himself to saying: "al-Suddi said". The proof of this is that in some places in al-Tabari's Tafsir the statement stops at al-Suddi, while the same statement is found in "Tarikh al-Tabari" "musnad", with mention of al-Suddi's teachers.