Unverified50% confidenceFactExact time

Simon Willison compiled a comparison grid covering all reasoning effort levels across OpenAI's current frontier product line, including GPT-6 Astra, GPT-6.1 Sol, GPT-6.1 Terra, and GPT-6 Luna

1

Sources

50%

Confidence

Short-term (~14 days)

Relevance

10/27/2026

First Seen

Valid until: 11/10/2026

Sources

GPT-6.1 Terra In-Depth: Positioning a Mid-Tier Model for Vision and Computer Use

Related Entities

Simon Willisonperson OpenAIcompany GPT-6 Astramodel GPT-6.1 Solmodel GPT-6.1 Terramodel GPT-6 Lunamodel

Related Claims

UnverifiedSimon Willison points out that GPT-6.1 Terra's positioning in OpenAI's product line is similar to that of the Sonnet model in Anthropic's model lineup76% similar UnverifiedOpenAI has released a usage guide for the GPT-6 series, introducing how to choose among the three models—Astra, Solo, and Luna—based on task requirements, and how to adjust reasoning levels and speed modes.74% similar

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