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 LunaOpenAI Remove
S2.1 ProFish Audio Remove
Transcribe 1 ProFish Audio Remove
Gemini 3.5 TranscribeGoogle Remove

4 is the maximum. Remove one to add another.

gpt-6-luna vs s2.1-pro vs transcribe-1-pro vs gemini-3.5-transcribe
Attribute	GPT-6 Lunagpt-6-luna	S2.1 Pros2.1-pro	Transcribe 1 Protranscribe-1-pro	Gemini 3.5 Transcribegemini-3.5-transcribe
Pricing
Input	$0.10 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Output	$0.50 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Cache Write (5m)	$0.10 / 1M	Not applicable	Not applicable	Not applicable
Cache Write (1h)	$0.10 / 1M	Not applicable	Not applicable	Not applicable
Cache Read	$0.10 / 1M	Not applicable	Not applicable	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1.1M	N/A	N/A	98.3K
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	No	No	Yes
Function Calling	Yes	No	No	Yes
JSON Mode	Yes	No	No	No
Streaming	Yes	No	No	No
Catalogue
Provider	OpenAI	Fish Audio	Fish Audio	Google
Category	chat	voice	voice	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	2026-07-29	2026-09-24	2026-09-25
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.	Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.	Fish Audio Transcribe 1 Pro speech-to-text with speaker labels; transcripts include speaker tags such as <\|speaker:0\|>. Billed per second of audio.	Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.