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
GPT-6 Sol ProOpenAI Remove
Perceptron Mk1.5Perceptron Remove
GPT-6 Astra ProOpenAI Remove

4 is the maximum. Remove one to add another.

s1 vs gpt-6-sol-pro vs perceptron-mk1.5 vs gpt-6-astra-pro
Attribute	S1s1	GPT-6 Sol Progpt-6-sol-pro	Perceptron Mk1.5perceptron-mk1.5	GPT-6 Astra Progpt-6-astra-pro
Pricing
Input	$0 / 1M	$2.00 / 1M	$0.15 / 1M	$10.00 / 1M
Output	$0 / 1M	$10.00 / 1M	$1.50 / 1M	$50.00 / 1M
Cache Write (5m)	Not applicable	$2.00 / 1M	$0.15 / 1M	$10.00 / 1M
Cache Write (1h)	Not applicable	$2.00 / 1M	$0.15 / 1M	$10.00 / 1M
Cache Read	Not applicable	$2.00 / 1M	$0.15 / 1M	$10.00 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	N/A	1.1M	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	OpenAI
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.	GPT-6 Sol Pro uses the same underlying model as GPT-6 Sol, but runs with reasoning.mode set to pro for higher-quality responses on complex and demanding tasks. Optimized for deeper reasoning, greater accuracy, and more reliable multi-step execution, it is particularly well suited for agentic coding, long-horizon software engineering, professional analysis, and complex automated workflows where solution quality takes priority over latency and cost.	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.	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.