OpenAI launches GPT-6 Sol and Luna at ~50% cheaper than 5.6, with stronger coding
charliermarsh · x · 2026-09-23
OpenAI introduced GPT-6 Sol and Luna, bringing Astra advances to faster, cheaper models priced roughly 50% below GPT-5.6. Sol at xhigh effort beats Claude Opus 5 at max effort on AutomationBench at 9% of the per-task cost; Luna at max effort exceeds GPT-5.6 Sol at medium effort on OSWorld 2.0 offline at one-tenth the cost. Sol makes about half as many factuality errors as 5.6 Sol on internal evals, and improved prompt caching gives 90% discounts on cached input-token reads for agents.
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