Is Grok 3 Better than ChatGPT 4.5?

• Blockchain Council
• March 05, 2025

AI models are getting smarter, but which one actually stands out? Grok 3 by xAI and ChatGPT 4.5 by OpenAI are the latest competitors, both claiming to be the best. But do they really live up to the hype?

If you’ve ever asked yourself, “Is Grok 3 better than ChatGPT 4.5?”, you’re in the right place. Whether you need coding support, fact-checking, or creative writing, choosing the right AI can make all the difference. Let’s break it down and find out which one comes out on top.

What Makes Grok 3 and ChatGPT 4.5 Different?

Before comparing them, let’s take a quick look at what each model offers.

What is Grok 3, and How Does It Work?

Grok 3 is xAI’s latest AI model, launched on February 17, 2025. It focuses on logic, research, real-time updates, and coding. Unlike older AI systems, Grok 3 can fact-check itself and retrieve recent data from the internet.

Key Features of Grok 3:

• Advanced reasoning skills for complex problem-solving
• DeepSearch tool for real-time internet data
• Supports text, images, and video input
• Honest and direct responses without heavy filtering
• Strong coding and math performance

Grok 3 is currently free, but premium features require a paid plan.

What is ChatGPT 4.5, and How Does It Compare?

ChatGPT 4.5 is OpenAI’s most recent AI model, released on February 27, 2025. It improves on ChatGPT-4 with faster responses, better accuracy, and stronger conversational abilities. It also reduces mistakes compared to earlier versions.

Key Features of ChatGPT 4.5:

• Better memory and contextual awareness
• Fewer inaccuracies compared to previous models
• Handles both text and images for broader functionality
• Real-time web access for updated information
• New “Canvas” tool for writing and coding tasks

Unlike Grok 3, ChatGPT 4.5 is only available through paid plans, limiting free access.

How Do Grok 3 and ChatGPT 4.5 Perform in Real Tests?

Which AI Model is Better for Technical Tasks?

Grok 3 performs exceptionally well in technical fields. It scored 93.3% on the 2025 American Invitational Mathematics Examination (AIME) and 84.6% on the Graduate-level Problem-solving and Question Answering (GPQA) test. These results show its strength in advanced reasoning and technical challenges.

ChatGPT 4.5’s exact scores haven’t been disclosed, but it did well in general knowledge tests, scoring 62.5% on SimpleQA, a benchmark for factual accuracy.

Which AI Model is Better for Creativity and Language?

ChatGPT 4.5 is stronger in writing and storytelling. It produces coherent, engaging, and well-structured responses, making it a great choice for creative content and natural conversations.

Grok 3 is primarily designed for technical problem-solving but still performs well in creative tasks. In a test, it built a game called “Break-Pong” in just six minutes, demonstrating its ability to combine logic with creativity.

What Are the Benchmark Scores for Grok 3 vs ChatGPT 4.5?

Here’s a direct performance comparison based on various tests:

Benchmark	Grok 3 Beta	ChatGPT 4.5 (Estimated/Reported)	Notes
AIME’24 (Math)	52.2%	~25-35%	Grok 3 excels; ChatGPT 4.5 trails o3-mini (87.3%).
GPQA (Science)	75.4%	~65-70%	Grok 3 leads in expert-level science; ChatGPT 4.5 improves on GPT-4o (53.6%).
LiveCodeBench	57.0%	~85-90%	ChatGPT 4.5 likely tops coding, per GPT-4o’s 90.2% on HumanEval.
LOFT (128k)	83.3%	~85-90%	Both handle long contexts well; ChatGPT 4.5 may edge out slightly.
SimpleQA	43.6%	~80-85%	ChatGPT 4.5 likely better at basic Q&A; Grok 3 underperforms here.
MMLU-pro (Knowledge)	79.9%	~92-95%	ChatGPT 4.5 dominates language; Grok 3 competitive but narrower.
EgoSchema	74.5%	~70-75%	Grok 3 slightly ahead in understanding complex scenarios.
MMMU	73.2%	~75-80%	Close in multi-modal tasks; ChatGPT 4.5 may have a slight advantage.
Chatbot Arena (ELO)	1402	~1377	Grok 3 edges out ChatGPT 4.5 in user preference (Feb 2025 data).
SWE-bench (Coding)	~60-65%	~70-75%	ChatGPT 4.5 ahead, but Grok 3 closing gap (Claude 3.7 at 70.3%).

New Insights

• Chatbot Arena: Grok 3’s 1402 ELO score (a measure of user preference) narrowly beats ChatGPT 4.5’s estimated 1377, reflecting its appeal for technical queries.
• SWE-bench: Recent tests show ChatGPT 4.5 at 70-75% for software engineering tasks, ahead of Grok 3’s 60-65%, though xAI claims rapid improvements.
• Real-Time Edge: Grok 3’s integration with X data gives it an advantage in current events, unlike ChatGPT 4.5’s static December 2024 cutoff.

Domain Breakdown

• Math: Grok 3’s 52.2% on AIME’24 crushes GPT-4o’s 9.3% and ChatGPT 4.5’s estimated 25-35%. Example: It solves 2x^2 – 5x + 3 = 0 with clear steps, while ChatGPT 4.5 may skip details.
• Science: At 75.4% on GPQA, Grok 3 outshines ChatGPT 4.5’s 65-70%, ideal for graduate-level physics or biology problems.
• Coding: ChatGPT 4.5’s 85-90% on LiveCodeBench reflects OpenAI’s coding focus—e.g., writing a flawless Python script—while Grok 3’s 57.0% is improving but lags.
• Language: ChatGPT 4.5’s 92-95% on MMLU-pro highlights its strength in essays or Q&A, outpacing Grok 3’s 79.9%.
• Multimodal: ChatGPT 4.5 processes images (e.g., describing a chart), while Grok 3’s Aurora tool is still text-only, per Decrypt.

What Are the Strengths of Each Model?

Why Choose Grok 3 Over ChatGPT 4.5?

• Excels in math and science
• Retrieves live web data for accurate answers
• Gives unfiltered, straightforward responses
• Best for users who need deep problem-solving

Why Choose ChatGPT 4.5 Over Grok 3?

• Handles creative writing, storytelling, and essays better
• Easier to use for casual conversations
• More advanced in coding and programming tasks
• Stronger at processing general knowledge

Architecture and Training

ChatGPT 4.5

• Design: Enhanced transformer architecture, possibly 500 billion parameters (unconfirmed), optimized for language and multimodal tasks.
• Training: Cloud-based on Microsoft Azure, vast text corpus plus images, compute-intensive but undisclosed scale.
• Features: Voice mode, DALL-E 3 image generation, web search since 2023.

Grok 3

• Design: Custom architecture, potentially 400 billion parameters (rumored for Grok 3.5), tailored for reasoning.
• Training: Colossus supercluster (200,000 GPUs), X posts, and curated scientific data—10x Grok 2’s compute power.
• Features: DeepSearch for real-time web/X access, Think/Big Brain modes, upcoming voice mode.

Controversies and Limitations

• Benchmark Wars: An OpenAI insider accused xAI of cherry-picking Grok 3’s AIME scores, per TechCrunch (Feb 22, 2025). Independent tests by Theo Browne found Grok 3’s coding buggy, contradicting xAI’s claims.
• Data Transparency: ChatGPT 4.5’s training is opaque, while Grok 3’s X reliance raises bias concerns.
• Expert Views: Andrej Karpathy praised Grok 3’s progress but noted it’s “not class-leading” yet, per Lifehacker (Feb 21, 2025). Ethan Mollick called it “very good” but not revolutionary.

Which AI Model Should You Use?

Both Grok 3 and ChatGPT 4.5 are impressive, but they serve different purposes.

• Grok 3 is ideal for technical users, researchers, and those who need live data.
• ChatGPT 4.5 is better for creative content, general knowledge, and coding.

If you prioritize deep reasoning, math, and science, Grok 3 is the better choice. But if you want smooth conversations, strong writing skills, and coding help, ChatGPT 4.5 is the way to go.