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.

GPT-6 AstraOpenAI Remove
Claude Sonnet 5.5Anthropic Remove
S2 ProFish Audio Remove
MAI-Transcribe 2Microsoft Remove

4 is the maximum. Remove one to add another.

gpt-6-astra vs claude-sonnet-5.5 vs s2-pro vs mai-transcribe-2
Attribute	GPT-6 Astragpt-6-astra	Claude Sonnet 5.5claude-sonnet-5.5	S2 Pros2-pro	MAI-Transcribe 2mai-transcribe-2
Pricing
Input	$10.00 / 1M	$2.00 / 1M	$0 / 1M	$0 / 1M
Output	$50.00 / 1M	$10.00 / 1M	$0 / 1M	$0 / 1M
Cache Write (5m)	$10.00 / 1M	$2.50 / 1M	Not applicable	Not applicable
Cache Write (1h)	$10.00 / 1M	$4.00 / 1M	Not applicable	Not applicable
Cache Read	$10.00 / 1M	$0.20 / 1M	Not applicable	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	1M	N/A	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	Yes	No	No
Function Calling	Yes	Yes	No	No
JSON Mode	Yes	Yes	No	No
Streaming	Yes	Yes	No	No
Catalogue
Provider	OpenAI	Anthropic	Fish Audio	Microsoft
Category	chat	chat	voice	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	—	2026-07-29	2026-09-03
Description
Summary	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.	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.	Microsoft MAI-Transcribe-2 speech-to-text. Billed per second of audio.