OpenAI Releases GPT-5.6 Sol: Here’s How It Stacks Up Against Other AI Models
DECRYPT ·
OpenAI has released GPT-5.6 Sol, alongside the cheaper Terra and Luna, ending a two-week preview the U.S. Department of Commerce kept boxed in. Sol in ultra mode tops Terminal-Bench 2.1 at 91.9% and matches Anthropic's restricted Mythos Preview on ExploitBench while burning roughly a third of the tokens. The launch lands one day after Grok 4.5 and hours after Meta's Muse Spark 1.1, leaving Google's November 2025 Gemini 3 as the oldest frontier flagship still standing. OpenAI's GPT-5.6 Sol is now public. The company released its new flagship model to general users today, launching alongside two smaller siblings, Terra and Luna, after the U.S. Department of Commerce kept a preview restricted to about 20 trusted partners for two weeks. The naming strategy is new for OpenAI. This is the first time the company gives names to its models instead of simply using numbers. Sol, Terra, and Luna mark capability tiers that can move on their own cadence. Sol is the flagship, Terra the everyday model OpenAI says matches GPT-5.5 at half the price, and Luna the cheaper option. Pricing runs $5 and $30 per million input and output tokens for Sol, dropping to $1 and $6 for Luna. (Tokens, for those not in the know, are the smallest unit of information a model can handle. And companies typically price their models on a per token basis for API services) Two new knobs ship with it: a max reasoning effort that lets Sol think longer, and an ultra mode that farms work out to subagents.
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