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GPT-5.6 Sol, Terra, and Luna: OpenAI Splits Agentic Coding Into Three TiersOpenAI previewed the GPT-5.6 family: Sol is the frontier tier, Terra is the balanced everyday tier, and Luna is the fast low-cost tier. The real shift is that model selection moves from 'which model is strongest' to 'which tier should this task be routed to'.
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