Key Features of GPT-4.5

• GPT-4.5 is OpenAI's largest model to date, trained using more computational resources and data than previous models.

• Compared to GPT-4o, it possesses a deeper and broader "world knowledge," enabling it to comprehend more complex backgrounds and contexts.

• OpenAI states that the increased model scale reduces the need to "fabricate" answers, significantly diminishing hallucination.

• GPT-4.5 demonstrates a breakthrough in "emotional intelligence," enabling it to better capture human intentions and emotions.

• User feedback indicates that GPT-4.5 exhibits more natural conversations compared to GPT-4o, particularly excelling in everyday queries, professional tasks, and creative writing (such as poetry).

• Unlike OpenAI's "o-series" reasoning models (e.g., o1, o3-mini), GPT-4.5 is not specifically focused on mathematical or scientific reasoning but is positioned as a general-purpose model.

• It is suitable for a wide range of applications, including writing, programming, and problem-solving.

• Supports real-time web browsing, file and image uploads, and ChatGPT's Canvas tool.

• Currently does not support Voice Mode, video, or screen sharing features.

Performance Metrics

• GPT-4.5 scored 62.5%, significantly higher than GPT-4o's 38.6% and o3-mini's 15%.

• Hallucination Rate: GPT-4.5 exhibited a hallucination rate of 37.1%, lower than GPT-4o's 59.8% and o3-mini's 80.3%.

• Shows limited improvement compared to GPT-4o but exhibits a slight advantage in language tasks.

• Mathematics and Science Tests:

• GPT-4.5 underperforms reasoning models like o3-mini in these areas, indicating it is not focused on STEM (Science, Technology, Engineering, Mathematics) tasks.

Comparison with Previous Models

• GPT-4.5 invested more resources in the pre-training phase, representing a scale jump comparable to the transition from GPT-3.5 to GPT-4o.

• It reduces hallucination, enhances writing ability and conversational fluency, but does not introduce groundbreaking new features.

• o-series models excel in chain-of-thought reasoning, suitable for mathematical and scientific problems.

• GPT-4.5 prioritizes instant responses and general-purpose utility, without focusing on reasoning as its core strength.

Availability of GPT-4.5

• Next Week: ChatGPT Plus and Team plan users can access GPT-4.5.

• The Week After: Enterprise and Education plan users will gain access.

• Supports file and image input

• Supports function calls, structured output, streaming responses

• Does not support Voice Mode, video, screen sharing (potential future additions)

Pricing Information

GPT-4.5 User Reviews: Mixed Reactions

• Many users commend GPT-4.5's natural conversational flow, particularly highlighting its performance in creative tasks. For instance, one user noted its "strong intuition and interesting personality" when writing stories and poems.

• One user mentioned that while GPT-4.5's responses can sometimes be overly ornate and lengthy, adjusting prompts can tailor the style to individual needs.

• User feedback suggests improvements in GPT-4.5's knowledge base and image processing capabilities. One user pointed out its ability to accurately process complex visual information and extract data, outperforming previous models.

• Furthermore, GPT-4.5's multilingual capabilities have been enhanced. Even users primarily focused on English content have noted stronger performance in non-English languages.

• Some tweets indicate that GPT-4.5 reduces instances of refusing to answer, provides more human-like replies, and adopts more standardized formatting, resulting in a more user-friendly overall experience.

• Multiple users believe that GPT-4.5's performance gains are not significant enough. One tweet stated that the "differences are subtle and not obvious" compared to GPT-4o, with progress being almost imperceptible in ordinary tasks.

• Other users complained about GPT-4.5's significantly slower response speed compared to GPT-4o, impacting daily usability.

• GPT-4.5's pricing has sparked widespread dissatisfaction. The API costs are $75 per million input tokens and $150 per million output tokens, significantly higher than GPT-4o's $2.5 and $10, respectively. Users question its cost-effectiveness, deeming it "too expensive."

• The ChatGPT Pro subscription fee of $200 per month has deterred many users, who express unwillingness to pay and prefer waiting for a free version or opting for more economical alternatives.

• In programming and reasoning tasks, GPT-4.5's performance is underwhelming. Some users claim it underperforms Claude 3.7 Sonnet, particularly exhibiting a noticeable gap in coding capabilities.

• One user stated that after 30 minutes of testing, while GPT-4.5 could provide interesting suggestions, its assistance in solving practical technical problems was limited.

• Some users believe that OpenAI's approach of solely enhancing performance by scaling model size is nearing its limits. A tweet pointed out that GPT-4.5 validates the "diminishing returns of scaling," suggesting a need for more innovation in the future.

• Some users argue that GPT-4.5 is positioned to provide natural conversations and broad knowledge rather than focusing on reasoning or programming, hence its mediocre performance in certain tasks is expected.

• Another tweet mentioned its improved linguistic nuance and emotional intelligence, but these advantages are difficult to quantify through tests and require practical usage to appreciate.

• Some users advise against subscribing to ChatGPT Pro for now, recommending waiting for more comprehensive evaluations. They believe that the current performance improvements may not justify the high cost.