OpenAI's New GPT-6 Sol and Luna Models Bring Astra Improvements to Cheaper Tiers
OpenAI today launched GPT–6 Sol and GPT–6 Luna, two new models that follow GPT–6 Astra. OpenAI says the new models were developed using methods similar to Astra's for improvements in professional work, factuality, coding, computer use, and alignment. GPT–6 Sol is for everyday work, and it costs less than Astra. GPT–6 Luna is an even cheaper model. Luna is optimized for fast responses and higher…
OpenAI has unveiled its latest AI models, GPT-6 Sol and GPT-6 Luna, which build upon the capabilities of their predecessor, GPT-6 Astra. These new models focus on enhancing professional work, accuracy, coding, computer usage, and alignment. GPT-6 Sol is designed for everyday tasks and is more affordable than Astra, while GPT-6 Luna offers even greater cost-efficiency and faster responses.
Both models demonstrate superior performance compared to their predecessors, with GPT-6 Sol showing a significant reduction in errors, approximately half as many as GPT-5.6 Sol. Notably, GPT-6 Sol excels in coding and computer use, matching or surpassing Claude Fable 5.1 scores on several benchmarks. OpenAI compared GPT-6 Sol to Opus 5 on various tests, although Anthropic recently released Opus 5.5, which outperforms Astra in some coding and knowledge work areas.
GPT-6 Sol and Luna incorporate the improved communication style introduced with Astra, resulting in more straightforward conversations with reduced jargon and fewer unnecessary details. The new models provide shorter, more substantive answers while minimizing misleading claims about their coding work in alignment testing. OpenAI has also reduced the token prices for Sol and Luna, making them even more cost-effective than their 5.6 counterparts.
Pricing details show that GPT-6 Sol is now $2 per million input tokens and $10 per million output tokens, half the price compared to GPT-5.6 Sol. GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens, a decrease from $0.20 and $1.20, respectively. While GPT-6 Sol costs half as much per token as Opus 5.5, this comparison isn't entirely straightforward since Opus 5.5 uses fewer tokens per task than Opus 5.
These advanced AI models, GPT-6 Sol and GPT-6 Luna, are now accessible in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise, and Edu users, starting today. GPT-6 Luna is available to Free and Go users in the desktop app, but they are not yet available in Chat mode.
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