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ChatGPT 4.5

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A research preview of our strongest GPT model.

4.7
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Inputs: textOutputs: text
Type
Saas
Company
OpenAI
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About ChatGPT 4.5

GPT-4.5 is a research preview of OpenAI's largest and best model for chat, released on February 27, 2025. It scales unsupervised learning with increased compute and data, resulting in broader world knowledge, deeper understanding, and reduced hallucinations compared to previous models. GPT-4.5 improves pattern recognition, creative insight generation, and natural conversation without explicit reasoning. It features better user intent following, higher 'EQ', and enhanced steerability through new scalable training techniques. Currently available to ChatGPT Pro users and developers via API, GPT-4.5 excels at writing, programming, and practical problem-solving while being more reliable across diverse topics.

Key Features

Scaling unsupervised learning with increased compute and data
Broader world knowledge and deeper understanding of the world
Reduced hallucination rate (37.1% on SimpleQA vs 61.8% for GPT-4o)
Improved ability to follow user intent and higher 'EQ'
New scalable techniques for training larger models from smaller model data
Enhanced steerability, nuance understanding, and natural conversation
Availability to ChatGPT Pro users and developers worldwide

Pros & Cons

Pros
  • Broader and more accurate world knowledge
  • Significantly reduced hallucinations compared to earlier models
  • More natural and intuitive conversational interactions
  • Better understanding of user intent and nuance
  • Higher 'EQ' for emotionally aware responses
  • Improved steerability and reliability across topics
  • Scales unsupervised learning for general intelligence improvements
Cons
  • Currently only a research preview with limited availability
  • Requires ChatGPT Pro subscription ($200/month) for access
  • Not designed for complex STEM or logic reasoning tasks (better suited by o-series models)
  • Still under exploration for full capabilities and limitations
  • May have higher computational cost due to being the largest model

Best For

Improving writing and content creationProgramming and code generationSolving practical problemsGenerating creative insights without explicit reasoningNatural conversation and interactionKnowledge-intensive question answering

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FAQ

What is GPT-4.5?
GPT-4.5 is OpenAI's largest and best model for chat, released as a research preview on February 27, 2025. It scales unsupervised learning to improve world knowledge, reduce hallucinations, and enable more natural conversation.
How does GPT-4.5 differ from reasoning models like o1?
GPT-4.5 advances unsupervised learning for broader knowledge and intuition, while reasoning models like o1 teach chain-of-thought for complex STEM/logic problems. They represent two complementary axes of AI intelligence.
Who can use GPT-4.5?
GPT-4.5 is available to ChatGPT Pro users and developers worldwide as a research preview.
What are the key improvements over GPT-4?
GPT-4.5 offers broader world knowledge, deeper understanding, reduced hallucinations (37.1% vs 61.8% on SimpleQA), improved user intent following, higher EQ, and more natural conversation.
Is GPT-4.5 better at reasoning?
No, GPT-4.5 is optimized for unsupervised learning and intuition, not explicit chain-of-thought reasoning. For complex reasoning tasks, OpenAI recommends o-series models.