GPT-5.6 Sol: Benchmarks, Pricing & API Access Guide 2026

OpenAI's GPT-5.6 Sol, introduced on June 26, 2026, is the latest flagship model in the GPT-5.6 family, which includes three tiers: Sol, Terra, and Luna, each tailored for different applications and priced between $1 to $30 per million tokens. Sol Ultra, the top-performing variant, excels in complex reasoning and coding tasks, achieving a leading 91.9% on the Terminal-Bench 2.1 benchmark. The model family is designed for a range of uses, from high-volume tasks to everyday workloads, with Terra offering a balance of cost and performance, and Luna optimized for speed and affordability. OpenAI has restricted the initial release to select partners due to U.S. government requests amid safety concerns, but plans broader API access soon. The announcement highlights the importance of a multi-provider strategy for developers to navigate a rapidly evolving AI landscape, ensuring flexibility, cost control, and optimal performance across various tasks.

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