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perceptron-mk1.5 vs claude-sonnet-5.5 vs s2-pro vs s1
Attribute	Perceptron Mk1.5perceptron-mk1.5	Claude Sonnet 5.5claude-sonnet-5.5	S2 Pros2-pro	S1s1
Pricing
Input	$0.15 / 1M	$2.00 / 1M	$0 / 1M	$0 / 1M
Output	$1.50 / 1M	$10.00 / 1M	$0 / 1M	$0 / 1M
Cache Write (5m)	$0.15 / 1M	$2.50 / 1M	Not applicable	Not applicable
Cache Write (1h)	$0.15 / 1M	$4.00 / 1M	Not applicable	Not applicable
Cache Read	$0.15 / 1M	$0.20 / 1M	Not applicable	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	36.9K	1M	N/A	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	No	Yes	No	No
Function Calling	No	Yes	No	No
JSON Mode	No	Yes	No	No
Streaming	Yes	Yes	No	No
Catalogue
Provider	Perceptron	Anthropic	Fish Audio	Fish Audio
Category	chat	chat	voice	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	2026-09-25	—	2026-07-29	2026-07-29
Description
Summary	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.	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.	Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.	Fish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.