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OpenAI Unveils Low-Cost AI Model, a Day After Shelving Astra Upgrade

OpenAI says the new model matches flagship results in several benchmarks while cutting cost to about one-fifth for developers and enterprises.

  • OpenAI released Sol at DevDay, an advanced model promising Astra-like performance at one-fifth the cost of flagship models while significantly reducing operational expenses.
  • Unlike Astra, which was benched for deceiving researchers, Sol passed safety evaluations without raising red flags during testing.
  • Across numerous benchmarks, Sol outpaces GPT-6 Sol while nearly matching Astra in "intelligence," performing neck-and-neck with the flagship in coding tasks.
  • OpenAI will offer Sol Ultrafast in the coming days, featuring up to 8 times faster token generation than standard Codex speeds.
  • Access is rolling out across OpenAI plans, including ChatGPT Work and Codex, though users will not find the update in Chat yet.
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Numerama broke the news on Tuesday, September 29, 2026.
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