Doubao-Seedream-4.5 vs grok-4-fast-non-reasoning

ByteDance Doubao-Seedream-4.5xAI grok-4-fast-non-reasoning
VendorByteDancexAI
Context window—2,097,152
Max output—30,000
ReasoningNoNo
Tool callingNoYes
File inputYesYes
Inputtext, imagetext, image
Outputimagetext
Released2025-09-262025-08-27