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claude-sonnet-5.5 vs universal-3-5-pro vs s2.1-pro vs perceptron-mk1.5
Attribute	Claude Sonnet 5.5claude-sonnet-5.5	Universal-3.5 Prouniversal-3-5-pro	S2.1 Pros2.1-pro	Perceptron Mk1.5perceptron-mk1.5
Pricing
Input	$2.00 / 1M	$0 / 1M	$0 / 1M	$0.15 / 1M
Output	$10.00 / 1M	$0 / 1M	$0 / 1M	$1.50 / 1M
Cache Write (5m)	$2.50 / 1M	Not applicable	Not applicable	$0.15 / 1M
Cache Write (1h)	$4.00 / 1M	Not applicable	Not applicable	$0.15 / 1M
Cache Read	$0.20 / 1M	Not applicable	Not applicable	$0.15 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	N/A	N/A	36.9K
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	No	Yes
Catalogue
Provider	Anthropic	AssemblyAI	Fish Audio	Perceptron
Category	chat	voice	voice	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	2026-09-22	2026-07-29	2026-09-25
Description
Summary	Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, serving as a direct upgrade to Sonnet 5. It excels at feature development, bug fixing, and creating polished documents, presentations, and spreadsheets, while offering clearer writing and communication than its predecessor.	AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.	Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.