OpenAI launches GPT-6 Sol and Luna
OpenAI says both models’ API prices are 50% below GPT-5.6 promotional pricing, crediting more efficient caching and inference.
TLDR
OpenAI announced GPT-6 Sol and Luna on September 22, 2026, saying they bring much of GPT-6 Astra’s strengths into faster, more affordable models for work at scale. The company says their API prices are 50% below GPT-5.6 promotional pricing.
Early impressions differ. One user reported that GPT-6 Sol used half the tokens and completed a task in one-fifth the time of GPT-5.6 Sol in their testing. Another said Sol seemed like a regression despite welcoming the lower price.
On September 23, Arena reported that GPT-6 Sol (Max) ranked fourth in Code Arena: WebDev with 1,689 points—72 points above GPT-5.6 Sol (xHigh), which ranked 17th. Arena said votes for Luna were still coming in.
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