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
Perceptron Mk1.5Perceptron Remove
S2 ProFish Audio Remove
Claude Sonnet 5.5Anthropic Remove

4 is the maximum. Remove one to add another.

gpt-6-luna vs perceptron-mk1.5 vs s2-pro vs claude-sonnet-5.5
Attribute	GPT-6 Lunagpt-6-luna	Perceptron Mk1.5perceptron-mk1.5	S2 Pros2-pro	Claude Sonnet 5.5claude-sonnet-5.5
Pricing
Input	$0.10 / 1M	$0.15 / 1M	$0 / 1M	$2.00 / 1M
Output	$0.50 / 1M	$1.50 / 1M	$0 / 1M	$10.00 / 1M
Cache Write (5m)	$0.10 / 1M	$0.15 / 1M	Not applicable	$2.50 / 1M
Cache Write (1h)	$0.10 / 1M	$0.15 / 1M	Not applicable	$4.00 / 1M
Cache Read	$0.10 / 1M	$0.15 / 1M	Not applicable	$0.20 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1.1M	36.9K	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	Yes	No	Yes
Catalogue
Provider	OpenAI	Perceptron	Fish Audio	Anthropic
Category	chat	chat	voice	chat
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	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.	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.