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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.

GPT-6.1 SolOpenAI Remove
Grok 4.20 Multi-AgentxAI Remove
Universal-3.5 ProAssemblyAI Remove

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gpt-6.1-sol vs grok-4.20-multi-agent vs universal-3-5-pro
Attribute	GPT-6.1 Solgpt-6.1-sol	Grok 4.20 Multi-Agentgrok-4.20-multi-agent	Universal-3.5 Prouniversal-3-5-pro
Pricing
Input	$2.00 / 1M	$2.00 / 1M	— Not priced per input token
Output	$10.00 / 1M	$6.00 / 1M	— Not priced per output token
Cache Write (5m)	$2.00 / 1M	$2.00 / 1M	Not applicable
Cache Write (1h)	$2.00 / 1M	$2.00 / 1M	Not applicable
Cache Read	$2.00 / 1M	$2.00 / 1M	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	2M	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	xAI	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-6.1 Sol is an upgraded high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra. It is optimized for agentic coding, computer use, document-heavy professional work, and multi-step business automation, delivering near-Astra-level capability at significantly lower cost. Compared with GPT-6 Sol, it offers improved factual reliability and stronger adherence to explicit constraints and user intent, making it well suited for complex, long-running agentic workflows where accurate and dependable execution is critical.	Grok 4.20 Multi-Agent is a specialized variant of xAI's Grok 4.20 designed for collaborative, agent-based workflows. It enables multiple agents to operate in parallel, coordinating tool use and synthesizing information to handle complex, multi-step tasks. Optimized for deep research and large-scale problem solving, the model supports configurable reasoning effort: 4 agents for low/medium settings and up to 16 agents for high/xhigh settings, enabling scalable parallel reasoning and execution.	AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.