OpenAI has begun general availability of its GPT-5.6 model family, a three-tier lineup led by the flagship Sol alongside the balanced Terra and the low-cost Luna, positioning the release as a step forward in coding and long-horizon agent performance while sharpening its efficiency claims against rivals. The rollout, announced on July 9, 2026, follows a limited preview and arrives amid a fast-moving cycle of model launches that has left the developer community parsing marketing hype against real-world results.
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