How OpenAI's GPT 5.6 Measures Up to SpaceX, Google, Anthropic

OpenAI launched its GPT-5.6 model family, led by the flagship Sol model, in general availability, positioning the company more competitively ahead of a potential IPO. Independent benchmarker Artificial Analysis ranked Sol second in intelligence behind Anthropic’s Claude Fable 5, but said it costs about one-third as much per task, highlighting a potential efficiency advantage. The article also says Sol outperforms recent models from SpaceX’s Grok 4.5 and Alphabet’s Gemini 3.5 on intelligence rankings, though it is pricier than both on maximum-reasoning tasks. OpenAI CEO Sam Altman said the model is 54% more efficient on coding tasks than competing models. The release could benefit major OpenAI infrastructure partners such as Microsoft, Oracle, AMD, and Broadcom, while the broader story reflects renewed momentum in AI competition. Separately, OpenAI’s No. 2 executive Fidji Simo plans to step down from her full-time role after medical leave, adding some leadership uncertainty.