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
Perceptron Mk1.5Perceptron Remove
S2 ProFish Audio Remove

4 is the maximum. Remove one to add another.

claude-sonnet-5.5 vs gpt-6-luna vs perceptron-mk1.5 vs s2-pro
Attribute	Claude Sonnet 5.5claude-sonnet-5.5	GPT-6 Lunagpt-6-luna	Perceptron Mk1.5perceptron-mk1.5	S2 Pros2-pro
Pricing
Input	$2.00 / 1M	$0.10 / 1M	$0.15 / 1M	$0 / 1M
Output	$10.00 / 1M	$0.50 / 1M	$1.50 / 1M	$0 / 1M
Cache Write (5m)	$2.50 / 1M	$0.10 / 1M	$0.15 / 1M	Not applicable
Cache Write (1h)	$4.00 / 1M	$0.10 / 1M	$0.15 / 1M	Not applicable
Cache Read	$0.20 / 1M	$0.10 / 1M	$0.15 / 1M	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	1.1M	36.9K	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	Yes	No
Catalogue
Provider	Anthropic	OpenAI	Perceptron	Fish Audio
Category	chat	chat	chat	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	—	2026-09-25	2026-07-29
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.	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.	Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.