Mitsubishi tried to improve the capabilities of the A6Ms with the A6M6, A6M7, and A6M8. But due to United States bombing campaign it was very difficult on industry.
The A6M6 Model 53c prototype first flew in November 1944. Due to engine failures the A6M6 was abandoned.
The A6M7 Model 63 prototype first flew in May 1945.
The A6M8 Model 54c first flew in April 1945.
The A6M7 entered production in May 1945.