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  7. A6 a6-051 · Cerebras：BlogFirst-partyAnalysis
    AI score72

    Cerebras explains model and reasoning-effort selection for GPT-5.6 Sol, Terra, and Luna

    Cerebras published a post introducing the three GPT-5.6 models Sol, Terra, and Luna in the Codex subscription; the three are trained and deployed independently and come with reasoning-effort levels, used to trade off among speed, cost, and intelligence. On price, Terra is half of Sol, and Luna is one-fifth of Sol, for both short and long contexts. The article suggests starting most tasks with Luna and upgrading to Terra or Sol when progress stalls; Sol can reach 750 tokens/s on Cerebras, and it also explains how to use the five reasoning levels in Codex, from Light to Ultra.

    Why read thisThe original article presents how to choose among the three GPT-5.6 models and five reasoning-effort levels, so readers can trade off speed, cost, and intelligence accordingly.