GPT-4.5 Is the Most Human AI Yet—But at 1300% the Cost

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OpenAI's GPT-4.5 Is the Most Human AI Yet—But at 1300% the Cost

Written by Aaron S.,

Editor-In-Chief

Last Updated: February 28, 2025

Key Takeaways

GPT-4.5 prioritizes natural, human-like interactions over reasoning but comes at a steep cost;
At $75 per million input tokens, GPT-4.5 is 10 times pricier than Claude 3.7 Sonnet and 1300% costlier than GPT-4o;
OpenAI Pro users get access now for $200 per month, while Plus users must wait until next week.

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OpenAI's GPT-4.5 Is the Most Human AI Yet—But at 1300% the Cost

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On February 27, OpenAI has introduced GPT-4.5, following closely behind Anthropic’s Claude 3.7 Sonnet and xAI’s Grok-3.

The company’s latest model is not about improved reasoning or problem-solving—its main focus is creating a more natural, human-like interaction. However, the cost of GPT-4.5 is surprisingly expensive.

GPT-4.5 comes with a hefty price tag: $75 per million input tokens and $150 per million output tokens. That makes it ten times more expensive than Claude 3.7 Sonnet and far pricier than its predecessor, GPT-4o.

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The latest AI model costs 2900% more for inputs and 1300% more for outputs compared to GPT-4o, which charges $2.50 per million input tokens and $10 per million output tokens.

OpenAI CEO Sam Altman acknowledged the cost, stating in a February 27 post on X:

Bad news: It is a giant, expensive model.

At the same time, Altman described GPT-4.5 as "the first model that feels like talking to a thoughtful person". He also shared that he was genuinely impressed by the advice it gave him in some interactions.

From a technical perspective, the model relies heavily on unsupervised learning, which focuses on improving language fluency and reducing incorrect responses. This required optimizing training methods and developing new systems to handle its scale efficiently.

For now, GPT-4.5 is available to Pro users paying $200 per month. Those on the $20 Plus plan will get access next week.

Meanwhile, Elon Musk's xAI has introduced its latest AI model, Grok 3. What sets Grok 3 apart from older models? Read the full story.