OpenAI

Astra, Sol, Luna: reading OpenAI’s current model lineup.

The catalog now separates demanding work, balanced work, and lower-cost tasks.

Source published 2026-09-29Announcement analysisBeginnersAI-assisted editorial

Sources checked 2026-10-13. Access and availability can change.

What changed

OpenAI’s current API catalog identifies GPT-6 Astra for complex reasoning and coding, GPT-6.1 Sol for a balance of capability and cost, and GPT-6 Luna for focused, high-volume work. These are the provider’s positioning statements.

The everyday takeaway

Pick a model around the task and the amount of checking it needs. A short rewrite and a long debugging session do not necessarily justify the same configuration. App access and API access are different products.

What we have verified

OpenAI’s API changelog dates GPT-6.1 Sol’s release to September 29. The catalog establishes the current lineup; it does not establish the same availability in every app or subscription. We have not run a controlled comparison of these three models for this briefing.

A second perspective

A measured look at the updated middle model. Treat the results as evidence about the evaluator’s tasks and configurations.

Sources & further reading

Open the source to check the original wording and current availability.

This is a source-linked briefing, not a hands-on product review. Provider claims and outside evaluations are identified in the text.