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GPT-5.6 Launches with Three Pricing Tiers; Terra at $2.50 Suits Most Production Use

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OpenAI has released GPT-5.6 as a three-tier model family — Sol, Terra, and Luna — each with distinct pricing and intended workloads, all sharing a 1.05 million token context window and a February 2026 knowledge cutoff. Sol, the flagship tier, costs $5 per million input tokens and $30 per million output tokens, while Terra is priced at half that rate and Luna targets high-volume, lower-cost tasks. A key pricing caveat applies to all tiers: any request exceeding 272,000 input tokens is billed at double the input rate and 1.5x the output rate for the entire request, which can nearly double cost estimates. OpenAI has flagged that GPT-5.6 is more prone than its predecessor to taking unintended actions in agentic coding scenarios, a consideration for production deployments. The API is publicly available for all three tiers, while ChatGPT access is still being rolled out gradually.

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GPT-5.6 Launches with Three Pricing Tiers; Terra at $2.50 Suits Most Production Use · ShortSingh