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After literally years of hype and speculation, OpenAI has officially launched a new lineup of large language models (LLMs), all different-sized variants of GPT-5, the long-awaited predecessor to its GPT-4 model from March of 2023, nearly 2.5 years ago.
The company is rolling out four distinct versions of the model — GPT-5, GPT-5 Mini, GPT-5 Nano, and GPT-5 Pro — to meet varying needs for speed, cost, and computational depth.
GPT-5 is the full-capability reasoning model, used in both ChatGPT and OpenAI’s application programming interface (API) for high-quality general tasks
is the full-capability reasoning model, used in both ChatGPT and for high-quality general tasks GPT-5 Pro is an enhanced version with extended reasoning and parallel compute at test time, designed for use in complex enterprise and research environments. It provides more detailed and reliable answers, especially in ambiguous or multi-step queries .
is an at test time, designed for use in complex enterprise and research environments. It provides more detailed and reliable answers, especially in ambiguous or multi-step queries . GPT-5 Mini is a smaller, faster version of the main model, optimized for lower latency and resource usage. It is used as a fallback when usage limits are reached or when minimal reasoning suffices.
is a smaller, faster version of the main model, optimized for lower latency and resource usage. It is used as a fallback when usage limits are reached or when minimal reasoning suffices. GPT-5 Nano is the most lightweight variant, built for speed and efficiency in high-volume or cost-sensitive applications. It retains reasoning capability, but at a smaller scale, making it ideal for mobile, embedded, or latency-constrained deployments
GPT-5 will soon be powering ChatGPT exclusively and replace all other models going forward for its 700 million weekly users, though ChatGPT Pro subscribers ($200) month can still select older models for the next 60 days.
As per rumors and reports, OpenAI has replaced the previous system of having users switch the underlying model powering ChatGPT with an automatic router that decides to engage a special “GPT-5 thinking” mode with “deeper reasoning” that takes longer to respond on harder queries, or uses the regular GPT-5 or mini models for simpler queries.
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