TL; DR
- OpenAI has announced its latest and most knowledgeable AI model—GPT 4.5.
- It is currently available for ChatGPT Pro users and API developers, expanding to Plus, Team, and EDU soon.
- GPT 4.5 comes with better world knowledge, accuracy, and improved conversational flow, but still weaker in reasoning than OpenAI o3 mini.
OpenAI has officially introduced GPT 4.5, calling it its “largest and most knowledgeable model yet.” The company is rolling it out as a research preview for ChatGPT Pro users and API developers, with availability expanding to Plus, Team, and EDU users next week. Enterprise and other tiers will follow. However, free-tier users are left out of this upgrade—at least for now.
What’s New in GPT-4.5?
OpenAI is scaling AI through two major paradigms: unsupervised learning and reasoning. Unlike its reasoning-heavy models like OpenAI o3, GPT 4.5 relies more on intuitive world knowledge rather than step-by-step logic.
OpenAI claims GPT 4.5 is their best chat model yet, giving you responses that feel more natural, warm, and emotionally nuanced. The model has deeper world knowledge, making it ideal for writing, programming, and problem-solving.
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OpenAI developed new scalable alignment techniques, training GPT 4.5 with data derived from smaller models. This improves factual accuracy while reducing hallucinations. It even outperforms GPT-4 Turbo in accuracy while maintaining lower hallucination rates across multiple benchmarks.
OpenAI even ran a “Vibes Test,” measuring how collaborative and engaging the model feels. Results showed that GPT 4.5 beats its predecessors in both EQ and conversational flow.
The model is trained using low-precision techniques and multi-data center scaling. This means that the inference speeds or response rate is going to be fast despite its larger size.
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Performance vs. Reasoning Models
While GPT 4.5 excels in knowledge-based tasks, it still lags behind OpenAI o3 mini in reasoning-heavy benchmarks like science and math. However, in areas that rely on world knowledge, like multilingual understanding and agentic coding, GPT 4.5 outperforms even o3 mini.
Availability and Future Plans
- Available Now: ChatGPT Pro users (via web, mobile, and desktop).
- Next Week: Plus and Team users get access.
- Coming Soon: EDU and Enterprise tiers.
- Developers: GPT 4.5 is now available across all paid API tiers, supporting function calling, structured outputs, and multimodal capabilities.
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OpenAI Mocking Meta? Uno Reverse?
Meanwhile, Sam Altman’s recent X (Twitter) activity adds an intriguing twist. He recently responded to CNBC’s report of Meta’s standalone Meta AI app—rivaling ChatGPT—with, “ok fine maybe we’ll do a social app.” In a follow-up, he quipped, “lol if Facebook tries to come at us and we just uno reverse them it would be so funny ,” playfully mocking Meta.
FAQs
1. What is GPT 4.5, and is it better than GPT 4 Turbo?
GPT 4.5 is OpenAI’s latest AI model, designed to be more knowledgeable and conversational. It has improved accuracy, reduced hallucinations, and a more natural tone. Yes, it outperforms GPT 4 Turbo in world knowledge.
2. Who can access GPT 4.5 right now?
GPT 4.5 is currently available for ChatGPT Pro users and API developers. It will expand to Plus, Team, and EDU users next week, with Enterprise and other tiers following later. Free users do not have access yet.
3. Will GPT 4.5 be available for free users?
As of now, OpenAI has not announced any plans to bring GPT 4.5 to free-tier users.
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