GPT-4.5 Arrives for ChatGPT Plus Subscribers—Here’s What to Expect

OpenAI has begun rolling out GPT-4.5, its newest and largest-ever AI model, marking another step forward in the competitive AI landscape. Starting today, subscribers on the ChatGPT Plus plan will gradually gain access over the next one to three days. The move was announced by CEO Sam Altman, who noted that OpenAI is managing user expectations by limiting initial access due to capacity constraints.

Key Points:

• GPT-4.5 is OpenAI’s largest AI model yet, trained with increased computational power.
• Rollout to ChatGPT Plus users will be staggered over three days.
• GPT-4.5 excels in conversational tasks but falls short on complex reasoning.
• The model is costly, with OpenAI evaluating significant usage fees.

GPT-4.5 promises better conversational skills and deeper world knowledge, potentially reducing the frustrating inaccuracies—also known as “hallucinations”—seen in earlier models. Unlike its predecessors, GPT-4.5 leverages significantly more data and computational resources during training, making it OpenAI’s largest model yet. The company says the model performs particularly well at practical problem-solving, everyday chat interactions, and creative tasks.

Yet the bigger size and enhanced training don’t necessarily make GPT-4.5 superior across the board. OpenAI has openly admitted that GPT-4.5 doesn’t match newer models in complex reasoning tasks, notably lagging behind competitors such as Anthropic’s Claude and DeepSeek’s AI models. Sam Altman, CEO of OpenAI, underscored this in a recent statement on X: “GPT-4.5 isn’t a reasoning model and won’t crush benchmarks.”

The pricing of GPT-4.5 may also give users pause. At $150 per million generated tokens, GPT-4.5 is 15 times more expensive than OpenAI’s popular GPT-4o model. This significant price hike raises questions about who will adopt it at scale, especially given its limitations in logical reasoning and multi-step problem-solving tasks.

Even with these caveats, GPT-4.5 remains compelling. According to OpenAI, internal tests show it excels at convincing other AI models—highlighting its persuasive conversational capabilities. It also includes full support for ChatGPT tools and APIs, allowing developers substantial flexibility.

For now, GPT-4.5’s release underscores OpenAI’s ongoing experimentation as it explores the trade-offs between power, performance, and practical usability. Users eager to test the latest model will gain access over the coming days, while OpenAI continues evaluating exactly how far—and how quickly—they can push the boundaries of their technology.