gpt-3.5-turbo-16k vs grok-4-fast-non-reasoning

OpenAI gpt-3.5-turbo-16kxAI grok-4-fast-non-reasoning
VendorOpenAIxAI
Context window16,3852,097,152
Max output4,09630,000
ReasoningNoNo
Tool callingYesYes
File inputNoYes
Inputtexttext, image
Outputtexttext
Released—2025-08-27