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
S1Fish Audio Remove
Muse Spark 1.3Meta Remove
Claude Sonnet 5.5Anthropic Remove

4 is the maximum. Remove one to add another.

gpt-6-astra-pro vs s1 vs muse-spark-1.3 vs claude-sonnet-5.5
Attribute	GPT-6 Astra Progpt-6-astra-pro	S1s1	Muse Spark 1.3muse-spark-1.3	Claude Sonnet 5.5claude-sonnet-5.5
Pricing
Input	$10.00 / 1M	$0 / 1M	$1.25 / 1M	$2.00 / 1M
Output	$50.00 / 1M	$0 / 1M	$4.25 / 1M	$10.00 / 1M
Cache Write (5m)	$10.00 / 1M	Not applicable	$1.25 / 1M	$2.50 / 1M
Cache Write (1h)	$10.00 / 1M	Not applicable	$1.25 / 1M	$4.00 / 1M
Cache Read	$10.00 / 1M	Not applicable	$1.25 / 1M	$0.20 / 1M
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	N/A	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	No	Yes	Yes
Catalogue
Provider	OpenAI	Fish Audio	Meta	Anthropic
Category	chat	voice	chat	chat
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	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.	Fish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.	Muse Spark 1.3 is Meta's multimodal reasoning model designed for long-running agentic, multi-agent, and coding workflows. It maintains context and information across extended tasks, enabling reliable execution in complex, multi-step environments. The model is optimized to resolve conflicting information, seek clarification or confirmation when necessary, and execute concisely, making it well suited for autonomous agents, collaborative multi-agent systems, and long-horizon software engineering workflows.	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.