Grok Build 0.1 vs GPT Image 2.6 Flare

xAI Grok Build 0.1OpenAI GPT Image 2.6 Flare
VendorxAIOpenAI
Context window256,000—
Max output——
ReasoningYesNo
Tool callingYesNo
File inputYesYes
Inputtext, imagetext, image
Outputtextimage
Released2026-05-302026-11-04