Last updated 08-15-2026
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GPT-4
GPT-4 is OpenAI's large language model built for advanced reasoning, instruction following, and safer responses across text tasks. OpenAI positions it as the successor along the GPT research line and makes it available through ChatGPT Plus and the developer API. The product page highlights alignment work with human feedback and expert review before release.
Compared with earlier GPT-3.5 chat models, GPT-4 emphasizes measurable safety and factuality gains rather than raw parameter counts alone. OpenAI reports it is 82% less likely to answer disallowed requests and 40% more likely to give factual replies on internal tests versus GPT-3.5. That trade-off targets teams that need stronger guardrails even if latency and cost run higher than smaller models.
GPT-4 shows up in production stories from Duolingo, Be My Eyes, Stripe, and Morgan Stanley wealth management on OpenAI's site. Developers reach it through the API platform, while ChatGPT Plus subscribers access it inside the chat product. OpenAI notes ongoing limitations around bias, hallucinations, and adversarial prompts that remain under active research.
82% lower rate of disallowed responses versus GPT-3.5 on OpenAI internal tests
40% higher likelihood of factual answers versus GPT-3.5 on OpenAI evaluations
Alignment pipeline used feedback from over 50 expert reviewers before launch
Available through ChatGPT Plus and the OpenAI developer API
Trained on Microsoft Azure AI supercomputers per OpenAI infrastructure notes
Documented safety gains over GPT-3.5 on OpenAI internal benchmarks
Ships through both ChatGPT Plus and a developer API
Named customer stories span education, accessibility, finance, and payments
Alignment process incorporated ChatGPT user feedback and expert review
OpenAI still lists bias, hallucination, and adversarial prompt risks
Full GPT-4 access requires ChatGPT Plus or paid API usage
Current ChatGPT pricing page emphasizes newer GPT-5.x models over GPT-4
What is GPT-4?
GPT-4 is OpenAI's advanced language model for text generation, reasoning, and instruction following. OpenAI describes it as the latest milestone in scaling deep learning along the GPT research path.
How can I access GPT-4?
GPT-4 is available on ChatGPT Plus and through the OpenAI API for developers. OpenAI's product page lists both channels for individuals and application builders.
How does GPT-4 improve safety over GPT-3.5?
OpenAI says GPT-4 is 82% less likely to respond to disallowed content and 40% more likely to produce factual responses than GPT-3.5 on internal evaluations after six months of alignment work.
Which companies use GPT-4?
OpenAI highlights GPT-4 customer stories from Duolingo, Be My Eyes, Stripe, and Morgan Stanley wealth management on its product page for education, accessibility, payments, and finance workflows.
Is GPT-4 free to use?
GPT-4 itself is not listed as a standalone free product. OpenAI offers a free ChatGPT tier with limited models, while GPT-4 access is tied to ChatGPT Plus and paid API usage.
What infrastructure trains GPT-4?
OpenAI states GPT-4 was trained on Microsoft Azure AI supercomputers. The same Azure stack is used to deliver GPT-4 to users worldwide according to the infrastructure section.