AnalysisAI ModelsOctober 28, 2026

OpenAI's Ted Sanders explains model naming: Luna < Terra < Sol < Astra

Read original source →simonwillison.net

OpenAI's model tiers are ordered Luna < Terra < Sol < Astra, with bigger models more performant, costlier per token, and better at recalling esoteric facts. Version numbers encode release order, family similarity, and improvement magnitude — 6.1 follows 5.6 but isn't a big enough leap for a 7.

People · Ted Sanders

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