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 Astra ProOpenAI Remove
Perceptron Mk1.5Perceptron Remove
S2 ProFish Audio Remove
GPT-6 LunaOpenAI Remove

4 is the maximum. Remove one to add another.

gpt-6-astra-pro vs perceptron-mk1.5 vs s2-pro vs gpt-6-luna
Attribute	GPT-6 Astra Progpt-6-astra-pro	Perceptron Mk1.5perceptron-mk1.5	S2 Pros2-pro	GPT-6 Lunagpt-6-luna
Pricing
Input	$10.00 / 1M	$0.15 / 1M	$0 / 1M	$0.10 / 1M
Output	$50.00 / 1M	$1.50 / 1M	$0 / 1M	$0.50 / 1M
Cache Write (5m)	$10.00 / 1M	$0.15 / 1M	Not applicable	$0.10 / 1M
Cache Write (1h)	$10.00 / 1M	$0.15 / 1M	Not applicable	$0.10 / 1M
Cache Read	$10.00 / 1M	$0.15 / 1M	Not applicable	$0.10 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	36.9K	N/A	1.1M
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	OpenAI
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 Astra Pro uses the same underlying model as GPT-6 Astra, but runs with reasoning.mode set to pro for higher-quality responses on complex tasks. Optimized for deeper reasoning, greater accuracy, and more reliable multi-step execution, it is well suited for demanding coding, analysis, and agentic workflows where solution quality takes priority over speed and cost.	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.	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.