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.

Claude Sonnet 5.5Anthropic Remove
GPT-6 LunaOpenAI Remove
S1Fish Audio Remove
Grok STT 1.0xAI Remove

4 is the maximum. Remove one to add another.

claude-sonnet-5.5 vs gpt-6-luna vs s1 vs grok-stt-1.0
Attribute	Claude Sonnet 5.5claude-sonnet-5.5	GPT-6 Lunagpt-6-luna	S1s1	Grok STT 1.0grok-stt-1.0
Pricing
Input	$2.00 / 1M	$0.10 / 1M	$0 / 1M	$0 / 1M
Output	$10.00 / 1M	$0.50 / 1M	$0 / 1M	$0 / 1M
Cache Write (5m)	$2.50 / 1M	$0.10 / 1M	Not applicable	Not applicable
Cache Write (1h)	$4.00 / 1M	$0.10 / 1M	Not applicable	Not applicable
Cache Read	$0.20 / 1M	$0.10 / 1M	Not applicable	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	1.1M	N/A	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	Yes	No	No
Function Calling	Yes	Yes	No	No
JSON Mode	Yes	Yes	No	No
Streaming	Yes	Yes	No	No
Catalogue
Provider	Anthropic	OpenAI	Fish Audio	xAI
Category	chat	chat	voice	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	—	2026-07-29	2026-07-23
Description
Summary	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.	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 S1 text-to-speech. Billed per UTF-8 byte of input text.	xAI Grok STT 1.0 speech-to-text. Billed per second of audio.