Grok-2vsClaude Opus 4
xAI vs Anthropic — Side-by-side model comparison
Head-to-Head Comparison
| Metric | Grok-2 | Claude Opus 4 |
|---|---|---|
| Provider | ||
| Arena Rank | #7 | #1 |
| Context Window | 128K | 200K |
| Input Pricing | $2.00/1M tokens | $5.00/1M tokens |
| Output Pricing | $10.00/1M tokens | $25.00/1M tokens |
| Parameters | Undisclosed | Undisclosed |
| Open Source | No | No |
| Best For | Real-time information, reasoning, coding | Complex reasoning, coding, agentic tasks |
| Release Date | Aug 13, 2024 | May 22, 2025 |
Grok-2
Grok-2 is xAI's flagship language model, designed with unique access to real-time data from the X platform (formerly Twitter). It features a 128K context window and delivers strong performance across reasoning, coding, and general knowledge tasks. Grok-2 differentiates itself through its ability to incorporate current events and trending discussions into its responses, making it particularly useful for tasks requiring up-to-the-minute information.
View xAI profile →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 →Key Differences: Grok-2 vs Claude Opus 4
Claude Opus 4 ranks higher in arena benchmarks (#1) indicating stronger overall performance.
Grok-2 is 2.5x cheaper on average, making it the better choice for high-volume applications.
Claude Opus 4 supports a larger context window (200K), allowing it to process longer documents in a single request.
When to use Grok-2
- +Budget is a concern and you need cost efficiency
- +Your use case involves real-time information, reasoning, coding
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
Cost Analysis
At current pricing, Grok-2 is 2.5x more affordable than Claude Opus 4. For a typical enterprise workload processing 100M tokens per month:
Grok-2 monthly cost
$600
100M tokens/mo (50/50 in/out)
Claude Opus 4 monthly cost
$1,500
100M tokens/mo (50/50 in/out)
The Verdict
This is a close matchup. Grok-2 and Claude Opus 4 each win in different categories, making the choice highly dependent on your use case. Choose Grok-2 for real-time information, reasoning, coding. Choose Claude Opus 4 for complex reasoning, coding, agentic tasks.
Last compared: March 2026 · Data sourced from public benchmarks and official pricing pages