Luna
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What is Luna?
OpenAI's small GPT tier, suited to quick, routine tasks where responsiveness and efficient use of a token budget matter most.
Luna is the small-capability GPT tier in Orbit's model registry. It is the lightweight end of the OpenAI ladder, comparable in capability to Claude Haiku for routine work that benefits from a fast response.
How it relates to Orbit
Orbit's Model Tiers can route a tier to Luna. See Complexity Tiers & Routing for details.
When you would use it
Use Luna when the work is well bounded and speed matters more than extended deliberation.
Common operations
- Handling short summaries, classifications, and other routine assistant work.
- Acting as a lightweight helper when a task does not require the deeper reasoning of higher tiers.