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
GPT-6 SolOpenAI Remove
Universal-3.5 ProAssemblyAI Remove

Add a model

gpt-6-astra vs gpt-6-sol vs universal-3-5-pro
Attribute	GPT-6 Astragpt-6-astra	GPT-6 Solgpt-6-sol	Universal-3.5 Prouniversal-3-5-pro
Pricing
Input	$10.00 / 1M	$2.00 / 1M	$0 / 1M
Output	$50.00 / 1M	$10.00 / 1M	$0 / 1M
Cache Write (5m)	$10.00 / 1M	$2.00 / 1M	Not applicable
Cache Write (1h)	$10.00 / 1M	$2.00 / 1M	Not applicable
Cache Read	$10.00 / 1M	$2.00 / 1M	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	1.1M	N/A
Max output	N/A	N/A	N/A
Capabilities
Vision	Yes	Yes	No
Function Calling	Yes	Yes	No
JSON Mode	Yes	Yes	No
Streaming	Yes	Yes	No
Catalogue
Provider	OpenAI	OpenAI	AssemblyAI
Category	chat	chat	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	—	2026-09-22
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.	GPT-6 Sol is OpenAI's cost-efficient high-end model in the GPT-6 series, positioned between the flagship GPT-6 Astra and the fast GPT-6 Luna tier. It is designed for professional knowledge work, agentic coding, business workflow automation, and computer-use tasks, with particular strength in long-horizon software engineering across real-world codebases. GPT-6 Sol approaches Astra-level factual reliability at a significantly lower cost, while sharing its clear and concise communication style. This balance of capability, reliability, and efficiency makes it well suited for production agents, complex engineering workflows, and scalable professional applications	AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.