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.

Perceptron Mk1.5Perceptron Remove
Universal-3.5 ProAssemblyAI Remove
S1Fish Audio Remove
Muse Spark 1.3Meta Remove

4 is the maximum. Remove one to add another.

perceptron-mk1.5 vs universal-3-5-pro vs s1 vs muse-spark-1.3
Attribute	Perceptron Mk1.5perceptron-mk1.5	Universal-3.5 Prouniversal-3-5-pro	S1s1	Muse Spark 1.3muse-spark-1.3
Pricing
Input	$0.15 / 1M	$0 / 1M	$0 / 1M	$1.25 / 1M
Output	$1.50 / 1M	$0 / 1M	$0 / 1M	$4.25 / 1M
Cache Write (5m)	$0.15 / 1M	Not applicable	Not applicable	$1.25 / 1M
Cache Write (1h)	$0.15 / 1M	Not applicable	Not applicable	$1.25 / 1M
Cache Read	$0.15 / 1M	Not applicable	Not applicable	$1.25 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	36.9K	N/A	N/A	1M
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	No	No	No	Yes
Function Calling	No	No	No	Yes
JSON Mode	No	No	No	Yes
Streaming	Yes	No	No	Yes
Catalogue
Provider	Perceptron	AssemblyAI	Fish Audio	Meta
Category	chat	voice	voice	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	2026-09-25	2026-09-22	2026-07-29	—
Description
Summary	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.	AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.	Fish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.	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.