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
Perceptron Mk1.5Perceptron Remove
GPT-6 LunaOpenAI Remove
GPT-6 AstraOpenAI Remove

4 is the maximum. Remove one to add another.

claude-sonnet-5.5 vs perceptron-mk1.5 vs gpt-6-luna vs gpt-6-astra
Attribute	Claude Sonnet 5.5claude-sonnet-5.5	Perceptron Mk1.5perceptron-mk1.5	GPT-6 Lunagpt-6-luna	GPT-6 Astragpt-6-astra
Pricing
Input	$2.00 / 1M	$0.15 / 1M	$0.10 / 1M	$10.00 / 1M
Output	$10.00 / 1M	$1.50 / 1M	$0.50 / 1M	$50.00 / 1M
Cache Write (5m)	$2.50 / 1M	$0.15 / 1M	$0.10 / 1M	$10.00 / 1M
Cache Write (1h)	$4.00 / 1M	$0.15 / 1M	$0.10 / 1M	$10.00 / 1M
Cache Read	$0.20 / 1M	$0.15 / 1M	$0.10 / 1M	$10.00 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	36.9K	1.1M	1M
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	No	Yes	Yes
Function Calling	Yes	No	Yes	Yes
JSON Mode	Yes	No	Yes	Yes
Streaming	Yes	Yes	Yes	Yes
Catalogue
Provider	Anthropic	Perceptron	OpenAI	OpenAI
Category	chat	chat	chat	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	2026-09-25	—	—
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.	Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.	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.	GPT-6 Astra is OpenAI's flagship model for demanding end-to-end professional work, designed for advanced analysis, software engineering, deep research, scientific tasks, and document creation. It is particularly strong in long-horizon agentic workflows, including tasks that require sustained reasoning, tool orchestration, and computer and browser use, making it well suited for complex autonomous workflows and production-grade knowledge work.