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Claude Opus 4vsGrok 3

Anthropic vs xAI — Side-by-side model comparison

Tied — both models win in equal categories

Head-to-Head Comparison

MetricClaude Opus 4Grok 3
Provider
Arena Rank
#1
#5
Context Window
200K
128K
Input Pricing
$5.00/1M tokens
$3.00/1M tokens
Output Pricing
$25.00/1M tokens
$15.00/1M tokens
Parameters
Undisclosed
Undisclosed
Open Source
No
No
Best For
Complex reasoning, coding, agentic tasks
Real-time info, reasoning, math
Release Date
May 22, 2025

Claude Opus 4

Claude Opus 4 is Anthropic's most powerful AI model, holding the #1 position on the Chatbot Arena leaderboard. It represents a breakthrough in extended thinking and agentic capabilities, able to work autonomously on complex multi-step tasks for hours. With a 200K token context window, it excels at analyzing entire codebases, lengthy legal documents, and research papers in a single pass. The model demonstrates exceptional performance in coding (setting new benchmarks on SWE-bench), advanced reasoning, and nuanced writing tasks. Its agentic capabilities allow it to use tools, navigate computers, and execute multi-step workflows with minimal human oversight. Opus 4 is the preferred choice for enterprises requiring the highest quality output on mission-critical tasks where accuracy and depth matter more than speed or cost.

View Anthropic profile →

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 →

Key Differences: Claude Opus 4 vs Grok 3

1

Claude Opus 4 ranks higher in arena benchmarks (#1) indicating stronger overall performance.

2

Grok 3 is 1.7x cheaper on average, making it the better choice for high-volume applications.

3

Claude Opus 4 supports a larger context window (200K), allowing it to process longer documents in a single request.

C

When to use Claude Opus 4

  • +You need the highest quality output based on arena rankings
  • +Quality matters more than cost
  • +You need to process long documents (200K context)
  • +Your use case involves complex reasoning, coding, agentic tasks
View full Claude Opus 4 specs →
G

When to use Grok 3

  • +Budget is a concern and you need cost efficiency
  • +Your use case involves real-time info, reasoning, math
View full Grok 3 specs →

Cost Analysis

At current pricing, Grok 3 is 1.7x more affordable than Claude Opus 4. For a typical enterprise workload processing 100M tokens per month:

Claude Opus 4 monthly cost

$1,500

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

Grok 3 monthly cost

$900

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

The Verdict

This is a close matchup. Claude Opus 4 and Grok 3 each win in different categories, making the choice highly dependent on your use case. Choose Claude Opus 4 for complex reasoning, coding, agentic tasks. Choose Grok 3 for real-time info, reasoning, math.

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

Frequently Asked Questions

Which is better, Claude Opus 4 or Grok 3?
Claude Opus 4 and Grok 3 are closely matched, each winning in different categories. Claude Opus 4 excels at complex reasoning, coding, agentic tasks, while Grok 3 is optimized for real-time info, reasoning, math. We recommend testing both for your specific use case.
How does Claude Opus 4 pricing compare to Grok 3?
Claude Opus 4 charges $5.00 per 1M input tokens and $25.00 per 1M output tokens. Grok 3 charges $3.00 per 1M input tokens and $15.00 per 1M output tokens. Grok 3 is the more affordable option, approximately 1.7x 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 Claude Opus 4 and Grok 3?
Claude Opus 4 supports a 200K token context window, while Grok 3 supports 128K tokens. Claude Opus 4 can process longer documents, codebases, and conversations in a single request. Context window size matters most for tasks involving long documents, large codebases, or extended conversations.
Can I use Claude Opus 4 or Grok 3 for free?
Claude Opus 4 is a paid API model starting at $5.00 per 1M input tokens. Grok 3 is a paid API model starting at $3.00 per 1M input tokens.
Which model has better benchmarks, Claude Opus 4 or Grok 3?
Claude Opus 4 holds arena rank #1, while Grok 3 holds rank #5. Claude Opus 4 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 Claude Opus 4 or Grok 3 better for coding?
Claude Opus 4 is specifically optimized for coding tasks. Grok 3's primary strength is real-time info, reasoning, math. For coding specifically, arena rank and code-specific benchmarks are the best indicators of performance.