Compare models

Put up to 4 models beside each other — token prices, context windows, capabilities and provider, from the same catalogue the model pages read.

Muse Spark 1.3Meta Remove
Universal-3.5 ProAssemblyAI Remove
Perceptron Mk1.5Perceptron Remove
S2 ProFish Audio Remove

4 is the maximum. Remove one to add another.

muse-spark-1.3 vs universal-3-5-pro vs perceptron-mk1.5 vs s2-pro
Attribute	Muse Spark 1.3muse-spark-1.3	Universal-3.5 Prouniversal-3-5-pro	Perceptron Mk1.5perceptron-mk1.5	S2 Pros2-pro
Pricing
Input	$1.25 / 1M	$0 / 1M	$0.15 / 1M	$0 / 1M
Output	$4.25 / 1M	$0 / 1M	$1.50 / 1M	$0 / 1M
Cache Write (5m)	$1.25 / 1M	Not applicable	$0.15 / 1M	Not applicable
Cache Write (1h)	$1.25 / 1M	Not applicable	$0.15 / 1M	Not applicable
Cache Read	$1.25 / 1M	Not applicable	$0.15 / 1M	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	N/A	36.9K	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	No	No	No
Function Calling	Yes	No	No	No
JSON Mode	Yes	No	No	No
Streaming	Yes	No	Yes	No
Catalogue
Provider	Meta	AssemblyAI	Perceptron	Fish Audio
Category	chat	voice	chat	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	2026-09-22	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.	AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.	Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.