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 ProFish Audio Remove
GPT-6 AstraOpenAI Remove
Perceptron Mk1.5Perceptron Remove
Claude Sonnet 5.5Anthropic Remove

4 is the maximum. Remove one to add another.

s2-pro vs gpt-6-astra vs perceptron-mk1.5 vs claude-sonnet-5.5
Attribute	S2 Pros2-pro	GPT-6 Astragpt-6-astra	Perceptron Mk1.5perceptron-mk1.5	Claude Sonnet 5.5claude-sonnet-5.5
Pricing
Input	$0 / 1M	$10.00 / 1M	$0.15 / 1M	$2.00 / 1M
Output	$0 / 1M	$50.00 / 1M	$1.50 / 1M	$10.00 / 1M
Cache Write (5m)	Not applicable	$10.00 / 1M	$0.15 / 1M	$2.50 / 1M
Cache Write (1h)	Not applicable	$10.00 / 1M	$0.15 / 1M	$4.00 / 1M
Cache Read	Not applicable	$10.00 / 1M	$0.15 / 1M	$0.20 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	N/A	1M	36.9K	1M
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	No	Yes	No	Yes
Function Calling	No	Yes	No	Yes
JSON Mode	No	Yes	No	Yes
Streaming	No	Yes	Yes	Yes
Catalogue
Provider	Fish Audio	OpenAI	Perceptron	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 S2 Pro text-to-speech. Billed per UTF-8 byte of input text.	GPT-6 Astra is OpenAI's flagship model for demanding end-to-end professional work, designed for advanced analysis, software engineering, deep research, scientific tasks, and document creation. It is particularly strong in long-horizon agentic workflows, including tasks that require sustained reasoning, tool orchestration, and computer and browser use, making it well suited for complex autonomous workflows and production-grade knowledge work.	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.