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 Luna ProOpenAI Remove
S1Fish Audio Remove
Transcribe 1 ProFish Audio Remove
Claude Sonnet 5.5Anthropic Remove

4 is the maximum. Remove one to add another.

gpt-6-luna-pro vs s1 vs transcribe-1-pro vs claude-sonnet-5.5
Attribute	GPT-6 Luna Progpt-6-luna-pro	S1s1	Transcribe 1 Protranscribe-1-pro	Claude Sonnet 5.5claude-sonnet-5.5
Pricing
Input	$0.10 / 1M	$0 / 1M	$0 / 1M	$2.00 / 1M
Output	$0.50 / 1M	$0 / 1M	$0 / 1M	$10.00 / 1M
Cache Write (5m)	$0.10 / 1M	Not applicable	Not applicable	$2.50 / 1M
Cache Write (1h)	$0.10 / 1M	Not applicable	Not applicable	$4.00 / 1M
Cache Read	$0.10 / 1M	Not applicable	Not applicable	$0.20 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1.1M	N/A	N/A	1M
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	Yes
Streaming	Yes	No	No	Yes
Catalogue
Provider	OpenAI	Fish Audio	Fish Audio	Anthropic
Category	chat	voice	voice	chat
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	—
Description
Summary	GPT-6 Luna Pro uses the same underlying model as GPT-6 Luna, but runs with reasoning.mode set to pro for higher-quality responses on complex tasks. It combines Luna's speed and cost efficiency with deeper reasoning and more reliable multi-step execution, making it well suited for advanced coding, computer use, and agentic workflows where higher solution quality is needed without moving to a larger GPT-6 tier.	Fish Audio S1 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.	Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, serving as a direct upgrade to Sonnet 5. It excels at feature development, bug fixing, and creating polished documents, presentations, and spreadsheets, while offering clearer writing and communication than its predecessor.