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

4 is the maximum. Remove one to add another.

s2-pro vs gpt-6-astra vs gpt-6-sol-pro vs perceptron-mk1.5
Attribute	S2 Pros2-pro	GPT-6 Astragpt-6-astra	GPT-6 Sol Progpt-6-sol-pro	Perceptron Mk1.5perceptron-mk1.5
Pricing
Input	$0 / 1M	$10.00 / 1M	$2.00 / 1M	$0.15 / 1M
Output	$0 / 1M	$50.00 / 1M	$10.00 / 1M	$1.50 / 1M
Cache Write (5m)	Not applicable	$10.00 / 1M	$2.00 / 1M	$0.15 / 1M
Cache Write (1h)	Not applicable	$10.00 / 1M	$2.00 / 1M	$0.15 / 1M
Cache Read	Not applicable	$10.00 / 1M	$2.00 / 1M	$0.15 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	N/A	1M	1.1M	36.9K
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	No	Yes	Yes	No
Function Calling	No	Yes	Yes	No
JSON Mode	No	Yes	Yes	No
Streaming	No	Yes	Yes	Yes
Catalogue
Provider	Fish Audio	OpenAI	OpenAI	Perceptron
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.	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.