SES AI (SES) 8-K Changes in Registrant's Certifying Accountant

Exhibit 16.1

KPMGLLP

TwoFinancialCenter

60SouthStreet

Boston,MA02111

June16,2023

SecuritiesandExchangeCommission

Washington, D.C.20549

LadiesandGentlemen:

We were previously principal accountants for SES AI Corporation (the Company), and under the date ofMarch16,2023,wereportedontheconsolidatedfinancial statementsofSESAICorporationasofDecember 31, 2022 and 2021 and for each of the years in the three-year period ended December 31, 2022,and the effectiveness of internal control over financial reporting as of December 31, 2022. On June 12, 2023,we were dismissed. We have read the Company’s statements included under Item 4.01 of its Form 8-K datedJune12,2023, andwe agreewithsuchstatements, exceptthat we arenotina positiontoagreeordisagree withtheCompany’sstatementthatthedecisiontodismissKPMGwasapprovedbytheAuditCommitteeoftheBoard ofDirectorsof theCompany andanystatements inItem4.01(b).

Verytrulyyours,

KPMG LLP, a Delaware limited liability partnership and a member firm ofthe

KPMGglobalorganizationofindependentmemberfirmsaffiliatedwith

KPMGInternationalLimited, aprivate Englishcompany limitedby guarantee.