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.

S2.1 ProFish Audio Remove
Claude Opus 5.5Anthropic Remove
Transcribe 1 ProFish Audio Remove
Perceptron Mk1.5Perceptron Remove

4 is the maximum. Remove one to add another.

s2.1-pro vs claude-opus-5.5 vs transcribe-1-pro vs perceptron-mk1.5
Attribute	S2.1 Pros2.1-pro	Claude Opus 5.5claude-opus-5.5	Transcribe 1 Protranscribe-1-pro	Perceptron Mk1.5perceptron-mk1.5
Pricing
Input	$0 / 1M	$4.00 / 1M	$0 / 1M	$0.15 / 1M
Output	$0 / 1M	$20.00 / 1M	$0 / 1M	$1.50 / 1M
Cache Write (5m)	Not applicable	$5.00 / 1M	Not applicable	$0.15 / 1M
Cache Write (1h)	Not applicable	$8.00 / 1M	Not applicable	$0.15 / 1M
Cache Read	Not applicable	$0.40 / 1M	Not applicable	$0.15 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	N/A	1M	N/A	36.9K
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	No	Yes	No	Yes
Catalogue
Provider	Fish Audio	Anthropic	Fish Audio	Perceptron
Category	voice	chat	voice	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	2026-07-29	—	2026-09-24	2026-09-25
Description
Summary	Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.	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.	Fish Audio Transcribe 1 Pro speech-to-text with speaker labels; transcripts include speaker tags such as <\|speaker:0\|>. Billed per second of audio.	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.