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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 LunaOpenAI Remove
Gemma 4 31B (Free)Google Remove
Universal-3.5 ProAssemblyAI Remove

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gpt-6-luna vs gemma-4-31b-it:free vs universal-3-5-pro
Attribute	GPT-6 Lunagpt-6-luna	Gemma 4 31B (Free)gemma-4-31b-it:free	Universal-3.5 Prouniversal-3-5-pro
Pricing
Input	$0.10 / 1M	$0 / 1M	— Not priced per input token
Output	$0.50 / 1M	$0 / 1M	— Not priced per output token
Cache Write (5m)	$0.10 / 1M	—	Not applicable
Cache Write (1h)	$0.10 / 1M	—	Not applicable
Cache Read	$0.10 / 1M	$0 / 1M	Not applicable
Web Search	$0 / 1M	—	$0 / 1M
Cache Write	—	$0 / 1M	—
Context
Max context	1.1M	262.1K	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	Google	AssemblyAI
Category	chat	chat	voice
Charge type	Pay As You Go	Free	Pay As You Go
Released	—	—	2026-09-22
Description
Summary	GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, optimized for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks. It combines low-cost, responsive inference with the GPT-6 family’s improvements in factual reliability and clear, concise communication. At higher reasoning effort, GPT-6 Luna can also handle complex software engineering and computer-use workflows that previously required a Sol-tier model, making it a versatile choice for scalable production applications that need to balance speed, cost, and capability.	Gemma 4 31B Instruct is Google DeepMind's 30.7B dense multimodal model, supporting text and image inputs with text outputs. It features a 256K token context window, configurable thinking/reasoning modes, native function calling, and broad multilingual support across 140+ languages. The model delivers strong performance in coding, reasoning, and document understanding, making it well suited for developer workflows, multilingual applications, and structured knowledge tasks.	AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.