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GPT-4.5 and GPT-5 were OpenAI model releases with different designs.
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GPT-4.5 emphasized broad pretraining, conversational nuance, and general-purpose knowledge; GPT-5 launched as a ChatGPT system with fast and reasoning models plus a router. These are historical launch descriptions, and model access changes over time.
OpenAI introduced GPT-4.5 as a research preview in February 2025, describing it as a large general-purpose model that focused on broader world knowledge, nuanced intent, and warm conversation rather than explicit reasoning before answering. GPT-5 launched in August 2025 as a unified ChatGPT system with a fast model, a deeper reasoning model, and a real-time router. In the API, OpenAI described direct access to the reasoning model and released GPT-5, GPT-5 mini, and GPT-5 nano. OpenAI’s release notes state that GPT-4.5 was retired from ChatGPT on June 27, 2026; the notice said the change applied to ChatGPT only, with no API change at that time.
Comparing GPT-4.5’s non-reasoning response style with GPT-5’s launch-time automatic routing
Using GPT-5 API variants to trade off performance, cost, and latency
Distinguishing a ChatGPT system composed of multiple models from a single API model endpoint
Checking official release notes for model retirement and availability changes
OpenAI’s model families and access channels continue to change. Historical comparisons should name the release date and distinguish ChatGPT availability from API access. Use current model docs and release notes for present-day availability.
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GPT-4.5 and GPT-5 were OpenAI model releases with different designs. GPT-4.5 emphasized broad pretraining, conversational nuance, and general-purpose knowledge; GPT-5 launched as a ChatGPT system with fast and reasoning models plus a router. These are historical launch descriptions, and model access changes over time.
OpenAI described GPT-5 in ChatGPT as a fast model, a deeper reasoning model, and a router that chooses between them based on the request.
GPT-4.5 (Orion) era un gran modelo sin razonamiento centrado en un conocimiento amplio, reducción de alucinaciones y una sensación de conversación más natural.
Las variantes mini y nano más pequeñas brindan a los desarrolladores opciones más económicas y rápidas para tareas que no necesitan el modelo insignia completo.
OpenAI described GPT-4.5 as a non-reasoning model whose strengths included broader knowledge, nuanced intent understanding, and natural conversation.
GPT-5 tenía como objetivo reducir las tasas de alucinaciones y al mismo tiempo mejorar la codificación, el uso de herramientas y la capacidad de manejar tareas agentes más largas.
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