ChatGPT
The default general-purpose assistant for drafting buyer emails, specs and follow-ups.
Chatbots
Moonshot's assistant famous for very long context, ideal for contract review.
Kimi, from Moonshot AI, made its name on extremely long context windows — hundreds of pages in one prompt. Procurement contracts, SLAs and full tender packs can be read end to end without chunking.
The assistant is free to use on web and mobile, with paid tiers for heavier use. Chinese and English both work well; the interface defaults to Chinese.