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.

S1Fish Audio Remove
Perceptron Mk1.5Perceptron Remove
Claude Sonnet 5.5Anthropic Remove
Claude Opus 5.5Anthropic Remove

4 is the maximum. Remove one to add another.

s1 vs perceptron-mk1.5 vs claude-sonnet-5.5 vs claude-opus-5.5
Attribute	S1s1	Perceptron Mk1.5perceptron-mk1.5	Claude Sonnet 5.5claude-sonnet-5.5	Claude Opus 5.5claude-opus-5.5
Pricing
Input	$0 / 1M	$0.15 / 1M	$2.00 / 1M	$4.00 / 1M
Output	$0 / 1M	$1.50 / 1M	$10.00 / 1M	$20.00 / 1M
Cache Write (5m)	Not applicable	$0.15 / 1M	$2.50 / 1M	$5.00 / 1M
Cache Write (1h)	Not applicable	$0.15 / 1M	$4.00 / 1M	$8.00 / 1M
Cache Read	Not applicable	$0.15 / 1M	$0.20 / 1M	$0.40 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	N/A	36.9K	1M	1M
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	No	No	Yes	Yes
Function Calling	No	No	Yes	Yes
JSON Mode	No	No	Yes	Yes
Streaming	No	Yes	Yes	Yes
Catalogue
Provider	Fish Audio	Perceptron	Anthropic	Anthropic
Category	voice	chat	chat	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	2026-07-29	2026-09-25	—	—
Description
Summary	Fish Audio S1 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.	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.	Claude Opus 5.5 is Anthropic's flagship model for advanced reasoning, coding, and long-horizon agentic workflows, succeeding Opus 5. It excels at multi-step changes across large codebases, code review and bug detection, financial and scientific analysis, and understanding dense charts, diagrams, and screenshots, with stronger grounding when reporting figures and citing sources. Compared with Opus 5, it completes comparable tasks with fewer steps and lower token usage while providing clearer, more concise progress reporting. With adaptive thinking and configurable effort levels, Opus 5.5 can balance reasoning depth, latency, and cost, making it well suited for both demanding autonomous workflows and latency-sensitive professional tasks.