Amazon CEO Andy Jassy Bloomberg/Getty Images Amazon could start selling Trainium AI chips to external customers within two years. The company disclosed that its Trainium AI chips now have $225 billion in revenue commitments. Amazon is investing aggressively in its AI business with $200 billion in capex planned this year. Amazon says it could begin selling its Trainium AI chips to external customers within two years, putting the cloud giant in closer competition with Nvidia . During Wednesday's earnings call, CEO Andy Jassy said "there's a good chance" the company will start offering full racks of Trainium chips beyond its own cloud "over the next couple of years." That provides a clearer timeline for earlier comments in his April shareholder letter, where he only said expansion could happen "in the future." An Amazon spokesperson confirmed to Business Insider that this is the first time the company has provided a specific timeframe.…