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OpenAI released GPT-6 Sol and GPT-6 Luna on September 22, 2026, at $2 and $10 and $0.10 and $0.50 per million tokens, half the price of GPT-5.6. Sol makes about half as many factual errors as GPT-5.6 Sol. Luna scores 66.6% on DeepSWE for about $0.22 a task. GPT-6 Astra still leads every OpenAI benchmark.
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