OpenAI released GPT-4.5 on February 27, 2025—their most advanced language model yet. This new AI brings significantly more natural conversations, broader knowledge, and better emotional intelligence to the table.
Unlike the reasoning-focused o1 and o3 models that solve problems step-by-step, GPT-4.5 excels at intuitive understanding and natural dialogue. It represents what may be the final evolution of the classic GPT series before the anticipated GPT-5, which is expected to combine both approaches.
With reduced hallucinations, more concise responses, and improved ability to understand what users really mean, GPT-4.5 sets a new standard for conversational AI—though it comes with higher computational demands and a steeper price tag than previous models.
What is GPT-4.5? Understanding OpenAI's Latest Model
GPT-4.5 is OpenAI's most advanced general-purpose language model, designed to excel at natural conversations while providing enhanced knowledge, creativity, and understanding of human intent. Unlike specialized reasoning models that work through problems step by step, GPT-4.5 focuses on intuitive pattern recognition across its vast training data.
The model was trained on Microsoft Azure AI supercomputers using techniques similar to those employed for GPT-4o, including human-led fine-tuning and reinforcement learning with human feedback. While OpenAI hasn't disclosed the exact size, they've indicated that the jump in scale from GPT-4o to GPT-4.5 is comparable to the leap from GPT-3.5 to GPT-4o.
What sets GPT-4.5 apart is its focus on making interactions feel more natural. OpenAI's research scientist Mia Glaese noted that it has "the ability to engage in warm, intuitive, natural, flowing conversations" with "a stronger understanding of what users mean, especially when their expectations are more implicit."
GPT-4.5 vs GPT-4o: Key Differences and Improvements
When comparing GPT-4.5 to its predecessor GPT-4o, several significant improvements become apparent:
Feature | GPT-4.5 | GPT-4o |
|---|---|---|
Knowledge Base | Broader, more comprehensive | More limited |
Conversation Style | More natural, concise, and intuitive | More verbose, less fluid |
Hallucination Rate | 37.1% on SimpleQA | 61.8% on SimpleQA |
Factual Accuracy | 62.5% on SimpleQA | 38.2% on SimpleQA |
Emotional Intelligence | Significantly improved, better at reading social cues | Less adept at nuanced social understanding |
MMMLU Benchmark | 85.1% | 81.5% |
Response Length | Generally more concise | Tends toward longer responses |
Human testers consistently preferred GPT-4.5 over GPT-4o across various query types:
57.0% preference for everyday queries
63.2% preference for professional queries
56.8% preference for creative intelligence tasks
A key difference lies in how the models respond to emotional or nuanced prompts. For example, when told by a user that they were "going through a tough time after failing a test," GPT-4.5 responded with empathy and an open-ended offer of support: "Aw, I'm really sorry to hear that. Failing a test can feel pretty tough and discouraging, but remember, it's just one moment—not a reflection of who you are or your capabilities. Want to talk about what happened, or do you just need a distraction? I'm here either way."
In contrast, GPT-4o provided a more structured, bullet-pointed response that focused immediately on solutions rather than emotional validation.
GPT-4.5 vs o-Series Models: Different Approaches to AI
OpenAI now advances AI capabilities along two distinct paradigms:
Unsupervised Learning (GPT series): Models like GPT-4.5 focus on increasing world model accuracy and intuition through massive training on text data. They excel at general knowledge, creative tasks, and natural conversation.
Reasoning (o-series): Models like o1 and o3-mini are designed to "think" before responding, producing a chain of thought particularly effective for complex STEM or logic problems.
This distinction is evident in benchmark performances:
Benchmark | GPT-4.5 | OpenAI o3-mini |
|---|---|---|
SimpleQA (general knowledge) | 62.5% | 15% |
GPQA (science) | 71.4% | 79.7% |
AIME '24 (math) | 36.7% | 87.3% |
SWE-Bench Verified (coding) | 38.0% | 61.0% |
While GPT-4.5 significantly outperforms o3-mini on general knowledge, the reasoning-focused model maintains a strong advantage in mathematics, science, and coding tasks that require step-by-step logical thinking.
How to Access ChatGPT 4.5
Access to GPT-4.5 is being rolled out gradually due to the model's intensive computational requirements:
ChatGPT Pro users ($200/month) received immediate access on February 27, 2025
ChatGPT Plus and Team users will gain access the following week
Enterprise and Education tiers will receive access in subsequent weeks
Once available, you can select GPT-4.5 from the model dropdown in the ChatGPT interface. The model integrates with many of ChatGPT's features, including:
Web search capabilities
File and image uploads
Canvas for writing and coding tasks
However, GPT-4.5 does not currently support multimodal features like Voice Mode, video processing, and screensharing in ChatGPT.
ChatGPT 4.5 Pricing and Subscription Options
The pricing structure for GPT-4.5 reflects its advanced capabilities and intensive computational requirements:
ChatGPT Pro: $200/month (includes GPT-4.5 access)
ChatGPT Plus: Standard $20/month subscription, with GPT-4.5 access coming soon
Free tier: No GPT-4.5 access announced
For developers using the API, GPT-4.5 is significantly more expensive than previous models:
Type | Cost (per 1M tokens) |
|---|---|
Input | $75.00 |
Cached Input | $37.50 |
Output | $150.00 |
This makes GPT-4.5 among the most expensive models in OpenAI's lineup, reflecting its substantial computational demands.
GPT-4.5 API Integration
GPT-4.5 is available to developers through the Chat Completions API, Assistants API, and Batch API. The model supports key features including:
Function calling
Structured outputs
System messages
Streaming capabilities
Vision capabilities through image inputs
API rate limits vary by tier, with higher-tier customers receiving significantly higher throughput:
Tier | RPM (Requests Per Min) | TPM (Tokens Per Min) |
|---|---|---|
Tier 1 | 1,000 | 125,000 |
Tier 5 | 10,000 | 2,000,000 |
However, OpenAI has noted that GPT-4.5 is currently a research preview, and they're "evaluating whether to continue serving it in the API long-term" due to its computational intensity. They've encouraged developers to provide feedback on whether GPT-4.5 delivers unique value for their use cases.
GPT-4.5 Technical Capabilities and Limitations
GPT-4.5 excels in several key areas while having some notable limitations:
Strengths:
Improved factual accuracy: 62.5% accuracy on SimpleQA benchmark
Reduced hallucinations: 37.1% hallucination rate (compared to 61.8% for GPT-4o)
Enhanced conversational abilities: More natural dialogue with better social awareness
Creative content generation: Strong performance in writing and aesthetic tasks
Emotional intelligence: Better understanding of nuanced human intent
Limitations:
Reasoning capabilities: Weaker performance on complex math and logic problems
Computational requirements: Resource-intensive operation requiring significant GPU power
Still hallucinates: While improved, it still produces incorrect information 37.1% of the time
No multimodal output: Cannot currently generate audio or video
Cost: Substantially more expensive to run than previous models
OpenAI acknowledges that GPT-4.5 is not designed to outperform specialized reasoning models on complex logical tasks. Instead, it focuses on being a more capable general-purpose assistant with enhanced conversational abilities.
Practical Applications of ChatGPT 4.5
Based on early testing, GPT-4.5 shows particular promise for applications that benefit from its higher emotional intelligence and creativity:
Content Creation:
Writing assistance with more natural tone and flow
Creative writing with improved aesthetic intuition
More effective brainstorming sessions
Communication:
More empathetic customer service interactions
Nuanced responses to emotional or sensitive topics
Better understanding of implicit requests
Professional Tasks:
Improved summarization of complex information
More human-like coaching and feedback
Effective planning and workflow management
Education:
More engaging and personalized learning experiences
Better understanding of student needs and challenges
More natural explanations of complex concepts
According to OpenAI's internal testing, the model particularly excels at professional queries, with human evaluators preferring GPT-4.5 over GPT-4o in 63.2% of cases.
Impact on the AI Market and Language Models
GPT-4.5 represents both a continuation of OpenAI's scaling approach and potentially a transition point before a new generation of hybrid models. Sam Altman has suggested that GPT-4.5 will be the last release in OpenAI's classic lineup, with GPT-5 expected to combine general-purpose capabilities with reasoning abilities.
This release comes at a time when some AI experts have questioned whether simply scaling up existing model architectures will continue to yield significant improvements. OpenAI's Nick Ryder remains optimistic, stating: "Personally, I'm very optimistic about finding ways through those bottlenecks and continuing to scale. I think there's something extremely profound and exciting about pattern-matching across all of human knowledge."
Not all industry experts share this enthusiasm. Waseem Alshikh, CTO of Writer (an enterprise LLM startup), described GPT-4.5 as "a shiny new coat of paint on the same old car" and suggested that "the juice isn't worth the squeeze when you consider the energy costs and the fact that most users won't notice the difference in daily use."
As competition in the AI space intensifies, with models like Claude, Gemini, and Llama advancing rapidly, OpenAI's two-track approach of developing both general-purpose GPT models and specialized reasoning models positions them to address diverse market needs.
Enhancing GPT-4.5 with mymeet.ai for Comprehensive Meeting Intelligence
While GPT-4.5 excels at natural conversation and emotional intelligence, it shares a fundamental limitation with all conversational AI models – it cannot join or analyze your actual meetings. This is where mymeet.ai creates a powerful complementary solution for teams seeking to leverage GPT-4.5's capabilities.
mymeet.ai is a specialized AI meeting assistant that automatically joins, records, and analyzes meetings across platforms like Zoom, Google Meet, and Телемост. Unlike GPT-4.5, which requires direct user input, mymeet.ai actively participates in meetings, creating detailed transcripts with speaker identification and extracting action items without human intervention.
This combination creates a particularly effective workflow. mymeet.ai captures the nuanced conversations that occur in meetings – including tone, context, and emotional subtext – creating rich material that GPT-4.5 can then analyze with its enhanced emotional intelligence and conversational understanding.
Real-World Applications of mymeet.ai with GPT-4.5
The integration of these tools unlocks unique capabilities for various team types:
Customer Experience Teams: When mymeet.ai captures customer service calls or feedback sessions, GPT-4.5's superior emotional intelligence allows it to detect subtle customer sentiments and implicit needs that might otherwise be missed. This helps teams develop more responsive strategies and personalized solutions.
Creative Collaboration: For creative teams, mymeet.ai can document brainstorming sessions and ideation meetings, while GPT excels at expanding these creative concepts with its intuitive understanding and natural flow – something the more logic-focused o-series models would struggle with.
Leadership Communication: Executive meetings recorded by mymeet.ai can be analyzed by GPT-4.5 to extract nuanced strategic directions and communication styles. GPT-4.5's ability to understand implicit meaning helps translate high-level directives into actionable plans.
Learning and Development: Training sessions captured by mymeet.ai can be transformed by GPT-4.5 into personalized learning materials that adapt to different learning styles – leveraging its 63.2% human preference rate for professional content.
By combining mymeet.ai's meeting capture capabilities with GPT-4.5's conversational prowess, organizations can ensure they don't lose valuable insights from live conversations – especially the emotional and contextual elements that GPT-4.5 is uniquely positioned to understand.
As GPT-4.5 continues to evolve toward the anticipated hybrid approach of GPT-5, this integration will become even more powerful, capturing not just what was said in meetings, but the true meaning and implications behind those conversations.
The Future: From GPT-4.5 to GPT-5 and Beyond
OpenAI has signaled that GPT-4.5 may represent the end of an era for their classic language model lineup. According to reports, GPT-5 is expected to be a hybrid system that combines the best aspects of both paradigms: the broad knowledge and intuitive responses of GPT models with the structured reasoning capabilities of the o-series.
The company believes that these two approaches to scaling—pre-training and reasoning—will ultimately complement each other. As models like GPT-4.5 become smarter and more knowledgeable through pre-training, they will serve as an even stronger foundation for reasoning and tool-using agents.
"We believe reasoning will be a core capability of future models," OpenAI stated in their GPT-4.5 announcement, suggesting that the evolution of AI will likely continue along both paths before eventually converging.
Conclusion
GPT-4.5 is a big step forward in making AI conversations feel natural. It understands what you're really asking and responds in a way that feels more human - less robotic explanations, more helpful dialogue.
It's not cheap at $200 a month for Pro access, and it still can't match specialized models at complex math or coding. But for everyday conversations and creative tasks, the difference is clear.
This model likely marks the end of one era and the beginning of another for OpenAI. Before GPT-5 arrives with its promised hybrid approach, GPT-4.5 shows us just how far conversational AI has come.
The future belongs to AI that doesn't just process your words but actually understands your meaning. GPT-4.5 takes us one step closer to that reality.
FAQ
What is GPT-4.5 and how does it compare to Chat GPT 4?
GPT-4.5 is OpenAI's newest and most advanced language model, released on February 27, 2025. Compared to Chat GPT 4 (GPT-4o), it offers more natural conversations, better emotional understanding, and fewer hallucinations. It's designed for intuitive interactions rather than step-by-step reasoning.
When was the GPT-4.5 release date?
OpenAI released GPT-4.5 on February 27, 2025.
What is Chat GPT 4.5 price?
Access to Chat GPT 4.5 requires a ChatGPT Pro subscription at $200/month. For developers, API usage costs $75 per million input tokens and $150 per million output tokens, making it more expensive than previous models.
Is there a free Chat GPT 4.5 option?
No, OpenAI has not announced any plans to make GPT-4.5 available to free tier users. Currently, it's only accessible through paid subscriptions.
How do I login to OpenAI to use GPT-4.5?
You can login to OpenAI through the ChatGPT website or app with your account credentials. If you have a Pro subscription, you'll find GPT-4.5 in the model selector dropdown.
How does OpenAI GPT-4.5 compare to o1 and o3-mini?
OpenAI GPT-4.5 excels at general knowledge, conversations, and creative tasks, while o-series models perform better on complex reasoning tasks in mathematics, science, and coding. GPT-4.5 feels more natural but lacks the step-by-step problem-solving abilities of o1.
Is there a GPT-4.5 Turbo or a Chat GPT 4.5 Turbo version?
OpenAI has not announced a GPT-4.5 Turbo version at this time, unlike previous models that had Turbo variants.
Can I use Chat GPT-4.5 online without a subscription?
No, Chat GPT-4.5 is not available without a subscription. You need a ChatGPT Pro account to access it online.
Does GPT 4.5 support images and other media?
Yes, GPT 4.5 can accept image inputs and works with file uploads, but it does not currently support Voice Mode, video processing, or screensharing features.
What's the difference between GPT-4.5 and GPT-4o?
The main differences between GPT-4.5 and GPT-4o are conversational quality, knowledge breadth, and emotional intelligence. GPT-4.5 provides more concise, natural responses and better understands implicit user needs. In tests, humans preferred GPT-4.5 for 57% of everyday queries.
