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What are OpenAI’s GPT-6 Sol and Luna, and which one should you use?

By Adam Neely · 2026-09-23 · 8 min
Quick answer: Sol and Luna bring GPT-6 capability to lower-cost everyday work; Astra is the step-up option for unusually long, autonomous computer tasks.

Sol and Luna bring GPT-6 capability to lower-cost everyday work; Astra is the step-up option for unusually long, autonomous computer tasks.

  1. Start with Sol or Luna for writing, summaries, routine analysis, coding assistance, and workflows where cost per attempt matters.
  2. Use a small representative task to compare accuracy, speed, and price before moving a whole workflow.
  3. Move to Astra when the job needs its roughly 1.05-million-token context, full computer use, and reliable execution across many linked steps.
  4. For every model, limit permissions, require approval before consequential actions, and verify facts, code, and outputs.
Good to know: The rollout is gradual, so model availability can differ by account, product, and API region. Astra’s “Critical” cybersecurity-capability rating is a reason for stronger controls, not a consumer performance score.
Source: TechCrunch
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