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OpenAI Launches GPT-6 Sol and Luna with Improved Intelligence at Lower Prices

Summary by Neowin
OpenAI has introduced two new models to its frontier lineup: GPT-6 Sol and GPT-6 Luna, delivering noticeable improvements in coding performance. Read more...
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OpenAI, as expected, has expanded the GPT-6 to include the Sol and Luna models to make the series a little more affordable: showing us successors to the 5.6 series counterparts. Benchmark results are secondary here, for good reason. AI geeks, vibecoders, enthusiasts and companies will like something else: API rates fall by about half compared to GPT-5.6.

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OpenAI replenishes the GPT-6 family with new models and now it's time for the GPT-6 Sol and GPT-6 Luna and they should be cheaper to run and, in other words, pull fewer tokens than the corresponding models in the GPT-5.6 family. GPT-6 Sol is for those who work with advanced coding and agent-based workflows, and GPT-6 Luna is designed [...]

Three weeks after Astra, OpenAI expands its GPT-6 range with two lighter models. Their price in the API is divided by two in relation to GPT-5.6's promotional rates.

Just a few hours after Anthropic's announcement for Claude Opus 5.5, OpenAI responded by introducing GPT-6 Sol and Luna. Two models faster and more affordable than GPT-6 Astra.

OpenAI expands its GPT-6 family. GPT-6 Astra, which was introduced at the beginning of September, is now followed by GPT-6 Sol and GPT-6 Luna. Both were released on September 22 and are expected to make many of Astra's improvements available at lower costs. The models fulfil different roles: Sol is designed for more demanding tasks, such as extensive programming or multiple [...]

The company introduced GPT-6 Sol and GPT-6 Luna, two models of the new generation, which complement the previously released flagship GPT-6 Astra, and reduced the cost of access through the API at least by half.

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Neowin broke the news in Plymouth, United States on Tuesday, September 22, 2026.
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