OpenAI has launched GPT-5, a new unified AI system that includes a primary fast model and a more deliberate thinking model, capable of handling up to 400K context length. This release introduces cost-effective variants, GPT-5-mini and GPT-5-nano, aiming to redefine the price-performance ratio for AI capabilities. GPT-5 demonstrates strong performance in coding and long-context reasoning tasks, positioning it competitively against models like Claude 4.1. AI
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RANK_REASON Frontier-lab model release with system card.