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In August 2025, OpenAI released the successor to GPT-4 with unified reasoning and non-reasoning capabilities in one model family, along with mini and nano variants.
OpenAI launched GPT-5 in August 2025 as the successor to GPT-4, combining traditional chat-style responses and dedicated step-by-step reasoning into a single unified model family rather than keeping them as separate product lines. Alongside the full model, OpenAI also released smaller mini and nano variants aimed at developers who need faster or cheaper responses for simpler tasks.
GPT-4.5 Turbo and o4 are plausible-sounding names given OpenAI's past naming patterns, but the actual successor model released in August 2025 that unified reasoning and non-reasoning capabilities was branded GPT-5, not either of these alternatives.
Unifying reasoning and non-reasoning capabilities into one family reflects a broader industry shift, since earlier models often required users to choose between a fast, simple chat model and a slower, more careful reasoning model for harder problems.
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