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muse-spark-1.3 vs grok-stt-1.0 vs gemini-3.5-transcribe vs s2-pro
Attribute	Muse Spark 1.3muse-spark-1.3	Grok STT 1.0grok-stt-1.0	Gemini 3.5 Transcribegemini-3.5-transcribe	S2 Pros2-pro
Pricing
Input	$1.25 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Output	$4.25 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Cache Write (5m)	$1.25 / 1M	Not applicable	Not applicable	Not applicable
Cache Write (1h)	$1.25 / 1M	Not applicable	Not applicable	Not applicable
Cache Read	$1.25 / 1M	Not applicable	Not applicable	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	N/A	98.3K	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	No	Yes	No
Function Calling	Yes	No	Yes	No
JSON Mode	Yes	No	No	No
Streaming	Yes	No	No	No
Catalogue
Provider	Meta	xAI	Google	Fish Audio
Category	chat	voice	voice	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	2026-07-23	2026-09-25	2026-07-29
Description
Summary	Muse Spark 1.3 is Meta's multimodal reasoning model designed for long-running agentic, multi-agent, and coding workflows. It maintains context and information across extended tasks, enabling reliable execution in complex, multi-step environments. The model is optimized to resolve conflicting information, seek clarification or confirmation when necessary, and execute concisely, making it well suited for autonomous agents, collaborative multi-agent systems, and long-horizon software engineering workflows.	xAI Grok STT 1.0 speech-to-text. Billed per second of audio.	Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.	Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.