I cannot create a summary of the requested article because it is not found in the search results provided. Searched articles deal with CAR-T cell therapies from BMS and other oncology treatments, but the specific article titled "BMS bets on Janux's novel solid tumor therapy through $850m deal" is not in them. The results mention Janux Therapeutics as a developer of immunotherapies based on its TRACTr and TRACIr platforms, but lack specific information about the $850 million deal with BMS. Without access to the original article, I cannot comply with your request to write only verified facts from it.