Muse Spark 1.3 Contributor vs gpt-5-pro

Meta Muse Spark 1.3 ContributorOpenAI gpt-5-pro
VendorMetaOpenAI
Context window1,048,576400,000
Max output—272,000
ReasoningYesYes
Tool callingYesYes
File inputYesYes
Inputtext, image, video, filetext, image
Outputtexttext
Released—2025-08-07