GPT-5.6 Introduces Three Model Tiers; Your Product Needs a Routing P&L
OpenAI's GPT-5.6 family introduces new model tiers that impact product routing economics.
OpenAI launched the GPT-5.6 family on July 9, 2026: Sol as the flagship, Terra as a lower-cost option, and Luna as the fastest, most cost-efficient tier. The introduction of three tiers emphasizes the need for routing in product economics rather than defaulting to the flagship model.
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