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.

Grok STT 1.0xAI Remove
S2.1 ProFish Audio Remove
Nova-3Deepgram Remove
GPT-6 LunaOpenAI Remove

4 is the maximum. Remove one to add another.

grok-stt-1.0 vs s2.1-pro vs nova-3 vs gpt-6-luna
Attribute	Grok STT 1.0grok-stt-1.0	S2.1 Pros2.1-pro	Nova-3nova-3	GPT-6 Lunagpt-6-luna
Pricing
Input	$0 / 1M	$0 / 1M	$0 / 1M	$0.10 / 1M
Output	$0 / 1M	$0 / 1M	$0 / 1M	$0.50 / 1M
Cache Write (5m)	Not applicable	Not applicable	Not applicable	$0.10 / 1M
Cache Write (1h)	Not applicable	Not applicable	Not applicable	$0.10 / 1M
Cache Read	Not applicable	Not applicable	Not applicable	$0.10 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	N/A	N/A	N/A	1.1M
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	No	No	No	Yes
Function Calling	No	No	No	Yes
JSON Mode	No	No	No	Yes
Streaming	No	No	No	Yes
Catalogue
Provider	xAI	Fish Audio	Deepgram	OpenAI
Category	voice	voice	voice	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	2026-07-23	2026-07-29	2026-07-15	—
Description
Summary	xAI Grok STT 1.0 speech-to-text. Billed per second of audio.	Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.	Deepgram Nova-3 speech-to-text. Billed per second of audio.	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.