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Put up to 4 models beside each other — token prices, context windows, capabilities and provider, from the same catalogue the model pages read.

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gpt-6-astra-pro vs s2-pro vs gemini-3.5-transcribe vs s1
Attribute	GPT-6 Astra Progpt-6-astra-pro	S2 Pros2-pro	Gemini 3.5 Transcribegemini-3.5-transcribe	S1s1
Pricing
Input	$10.00 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Output	$50.00 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Cache Write (5m)	$10.00 / 1M	Not applicable	Not applicable	Not applicable
Cache Write (1h)	$10.00 / 1M	Not applicable	Not applicable	Not applicable
Cache Read	$10.00 / 1M	Not applicable	Not applicable	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	N/A	98.3K	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	No	Yes	No
Function Calling	Yes	No	Yes	No
JSON Mode	Yes	No	No	No
Streaming	Yes	No	No	No
Catalogue
Provider	OpenAI	Fish Audio	Google	Fish Audio
Category	chat	voice	voice	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	2026-07-29	2026-09-25	2026-07-29
Description
Summary	GPT-6 Astra Pro uses the same underlying model as GPT-6 Astra, but runs with reasoning.mode set to pro for higher-quality responses on complex tasks. Optimized for deeper reasoning, greater accuracy, and more reliable multi-step execution, it is well suited for demanding coding, analysis, and agentic workflows where solution quality takes priority over speed and cost.	Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.	Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.	Fish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.