Andy Jassy is so bullish on Amazon's chips that he took a rare shot at Nvidia

Amazon CEO Andy Jassy.

Andrej Sokolow/picture alliance via Getty Images

• Andy Jassy shared his annual letter to Amazon shareholders — and AI was a big topic.
• The Amazon CEO said its chip business is "on fire."
• He also took a rare shot at Nvidia.

Andy Jassy used his annual letter to shareholders to tout Amazon's AI chip progress — and lay down the gauntlet to Nvidia.

Amazon is an Nvidia customer, but the e-commerce giant also makes its own AI chips, called Tranium.