Yes, the Lexar Professional CFexpress Type A Gold 256GB is compatible with the Sony Alpha 1.
Sony A1 accepts CFexpress Type A in both card slots. Lexar Gold Type A is a VPG400 card rated for all A1 movie formats including XAVC S-I 4K at 600Mbps.
“XAVC HS 8K 520Mbps CFexpress Type A memory card (VPG200 or higher) XAVC S-I 4K 600Mbps CFexpress Type A memory card (VPG200 or higher)”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)