GPT-5

About

GPT-5 is OpenAI's latest flagship language model, building on GPT-4o with substantial improvements in reasoning depth, context handling, and multimodal understanding. The headline feature is its 256K token context window — double GPT-4o's capacity — enabling processing of extremely long documents, entire book manuscripts, or massive codebases in a single pass. GPT-5 demonstrates significantly stronger performance on complex reasoning tasks like mathematical proofs, multi-step problem-solving, and scientific analysis compared to its predecessor. It also adds native video understanding to its multimodal capabilities, complementing the existing text, image, and audio support. For users of ChatGPT, GPT-5 powers the most capable tier with higher message limits, and the Pro subscription at USD 200 per month provides unlimited access to GPT-5 Turbo with priority during peak usage. For developers, GPT-5 maintains OpenAI's commitment to structured output via JSON mode, function calling, and the Assistants API. Early benchmarks show GPT-5 leading on MMLU, HumanEval, and several reasoning-specific evaluations. The model's estimated parameter count exceeds 2 trillion, making it one of the largest models ever deployed. For everyday users who found GPT-4o impressive, GPT-5 represents a noticeable step up in thoughtfulness and depth, particularly for complex, multi-step tasks that require sustained reasoning. The main consideration for developers is cost: GPT-5 API pricing is expected to be higher than GPT-4o, though OpenAI has historically maintained competitive pricing for their flagship models.

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