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Grok 3vsGPT-4o

xAI vs OpenAI — Side-by-side model comparison

GPT-4o leads 4/5 categories

Head-to-Head Comparison

MetricGrok 3GPT-4o
Provider
Arena Rank
#5
#2
Context Window
128K
128K
Input Pricing
$3.00/1M tokens
$2.50/1M tokens
Output Pricing
$15.00/1M tokens
$10.00/1M tokens
Parameters
Undisclosed
~200B (est.)
Open Source
No
No
Best For
Real-time info, reasoning, math
General purpose, coding, analysis
Release Date

Grok 3

Grok 3 is xAI's frontier AI model, trained on one of the world's largest GPU clusters (100,000 Nvidia H100s). It features real-time access to X (Twitter) data, giving it uniquely current information about world events, public sentiment, and trending topics. The model excels at coding, reasoning, and factual tasks while offering a distinctive personality that includes humor and directness. With strong performance on arena benchmarks, Grok 3 competes directly with GPT-4o and Claude Sonnet. Its differentiator is the real-time information access and willingness to engage with topics that other models may decline. Available through the xAI API and the Grok chatbot on X, it has quickly become one of the most capable models in the market.

View xAI profile →

GPT-4o

GPT-4o is OpenAI's flagship multimodal model, capable of processing text, images, and audio in a unified architecture. The 'o' stands for 'omni,' reflecting its ability to seamlessly handle multiple input types. With a 128K token context window and competitive pricing, it strikes an optimal balance between capability and cost-effectiveness. GPT-4o delivers fast response times while maintaining strong performance across coding, analysis, creative writing, and visual understanding tasks. It powers ChatGPT's default experience and is one of the most widely deployed AI models globally, serving millions of API calls daily. The model supports function calling, JSON mode, and structured outputs, making it highly versatile for production applications. Its combination of speed, quality, and multimodal capabilities makes it the go-to choice for most general-purpose AI applications.

View OpenAI profile →

Key Differences: Grok 3 vs GPT-4o

1

GPT-4o ranks higher in arena benchmarks (#2) indicating stronger overall performance.

2

GPT-4o is 1.4x cheaper on average, making it the better choice for high-volume applications.

G

When to use Grok 3

  • +Quality matters more than cost
  • +Your use case involves real-time info, reasoning, math
View full Grok 3 specs →
G

When to use GPT-4o

  • +You need the highest quality output based on arena rankings
  • +Budget is a concern and you need cost efficiency
  • +Your use case involves general purpose, coding, analysis
View full GPT-4o specs →

Cost Analysis

At current pricing, GPT-4o is 1.4x more affordable than Grok 3. For a typical enterprise workload processing 100M tokens per month:

Grok 3 monthly cost

$900

100M tokens/mo (50/50 in/out)

GPT-4o monthly cost

$625

100M tokens/mo (50/50 in/out)

The Verdict

GPT-4o wins our head-to-head comparison with 4 out of 5 category wins. It's the stronger choice for general purpose, coding, analysis, though Grok 3 holds an edge in real-time info, reasoning, math.

Last compared: April 2026 · Data sourced from public benchmarks and official pricing pages

Frequently Asked Questions

Which is better, Grok 3 or GPT-4o?
In our head-to-head comparison, GPT-4o leads in 4 out of 5 categories (arena rank, context window, input pricing, output pricing, and parameters). GPT-4o excels at general purpose, coding, analysis, while Grok 3 is better suited for real-time info, reasoning, math. The best choice depends on your specific requirements, budget, and use case.
How does Grok 3 pricing compare to GPT-4o?
Grok 3 charges $3.00 per 1M input tokens and $15.00 per 1M output tokens. GPT-4o charges $2.50 per 1M input tokens and $10.00 per 1M output tokens. GPT-4o is the more affordable option, approximately 1.4x cheaper on average. For high-volume production workloads, the pricing difference can significantly impact total cost of ownership.
What is the context window difference between Grok 3 and GPT-4o?
Grok 3 supports a 128K token context window, while GPT-4o supports 128K tokens. Context window size matters most for tasks involving long documents, large codebases, or extended conversations.
Can I use Grok 3 or GPT-4o for free?
Grok 3 is a paid API model starting at $3.00 per 1M input tokens. GPT-4o is a paid API model starting at $2.50 per 1M input tokens.
Which model has better benchmarks, Grok 3 or GPT-4o?
Grok 3 holds arena rank #5, while GPT-4o holds rank #2. GPT-4o performs better in overall arena benchmarks, which aggregate human preference ratings across coding, reasoning, and general tasks. Note that benchmarks don't capture every use case — we recommend testing both models on your specific tasks.
Is Grok 3 or GPT-4o better for coding?
Grok 3's primary strength is real-time info, reasoning, math. GPT-4o is specifically optimized for coding tasks. For coding specifically, arena rank and code-specific benchmarks are the best indicators of performance.