GPT-5.6 Luna vs Kimi K2.5

OpenAI GPT-5.6 LunaMoonshot Kimi K2.5
VendorOpenAIMoonshot
Context window1,050,000256,144
Max output128,00016,384
ReasoningYesYes
Tool callingYesYes
File inputYesYes
Inputtext, imagetext, video, file, image
Outputtexttext
Released2026-07-082026-01-26