BREAKING: OpenAI releases GPT-5.6 limited preview, claiming it outperforms Claude Mythos. The rollout follows a review by the US government, with broader availability planned in the coming weeks. GPT-5.6 models are named Sol, Terra, and Luna. • Sol – flagship, highest capability • Terra – balanced performance, around GPT-5.5 level at 2x lower cost • Luna – fastest and lowest-cost model(Crypto India)