88Z AI, 23 September — OpenAI has released the GPT-6 Sol and Luna models, cutting API prices by half compared to the 5.6 series. Luna's input price is lower than DeepSeek's off-peak rate, achieving GPT-5.6 Sol performance at about one-tenth the cost. Sol approaches Astra's performance with improved caching and inference efficiency, at a much lower cost than Claude Opus 5 and Fable 5.1.
At a glance
- GPT-6 Luna matches GPT-5.6 Sol performance at ~1/10 the cost, with input prices below DeepSeek's off-peak rates.
- GPT-6 Sol approaches Astra's performance while costing significantly less than Claude Opus 5 and Fable 5.1.
The update
OpenAI has officially launched two new models, GPT-6 Sol and GPT-6 Luna, with API pricing cut in half compared to the 5.6 series. Notably, Luna's input price is now lower than DeepSeek's off-peak rates, delivering performance comparable to GPT-5.6 Sol at approximately one-tenth of the cost. Meanwhile, Sol benefits from significant improvements in caching and inference efficiency, bringing its performance close to that of Astra in various benchmarks. At the same time, Sol operates at a cost far lower than Claude Opus 5 and Fable 5.1, demonstrating a strong advantage in cost-effectiveness.
Sources & editorial note
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