Model Comparison

Claude Opus 4 vs Grok-2

Claude Opus 4 significantly outperforms across most benchmarks. Grok-2 is 7.5x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4 outperforms in 1 benchmarks (GPQA), while Grok-2 is better at 0 benchmarks.

Claude Opus 4 significantly outperforms across most benchmarks.

Tue May 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-2 costs less

For input processing, Claude Opus 4 ($15.00/1M tokens) is 7.5x more expensive than Grok-2 ($2.00/1M tokens).

For output processing, Claude Opus 4 ($75.00/1M tokens) is 7.5x more expensive than Grok-2 ($10.00/1M tokens).

In conclusion, Claude Opus 4 is more expensive than Grok-2.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Tue May 26 2026 • llm-stats.com
Anthropic
Claude Opus 4
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
xAI
Grok-2
Input tokens$2.00
Output tokens$10.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 4 accepts 200,000 input tokens compared to Grok-2's 128,000 tokens. Claude Opus 4 can generate longer responses up to 32,000 tokens, while Grok-2 is limited to 8,000 tokens.

Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
xAI
Grok-2
Input128,000 tokens
Output8,000 tokens
Tue May 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4 and Grok-2 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 4

Text
Images
Audio
Video

Grok-2

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Opus 4

Proprietary

Closed source

Grok-2

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4 was released on 2025-05-22, while Grok-2 was released on 2024-08-13.

Claude Opus 4 is 9 months newer than Grok-2.

Claude Opus 4

May 22, 2025

1.0 years ago

9mo newer
Grok-2

Aug 13, 2024

1.8 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Opus 4 is available from Anthropic, Bedrock, Google. Grok-2 is available from xAI.

Claude Opus 4

anthropic logo
Anthropic
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
bedrock logo
AWS Bedrock
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
google logo
Google
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M

Grok-2

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Higher GPQA score (79.6% vs 56.0%)
xAI
Less expensive input tokens
Less expensive output tokens
AnthropicClaude Opus 4
xAIGrok-2
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4
xAI
Grok-2

FAQ

Common questions about Claude Opus 4 vs Grok-2.

Which is better, Claude Opus 4 or Grok-2?

Claude Opus 4 significantly outperforms across most benchmarks. Claude Opus 4 is made by Anthropic and Grok-2 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4 compare to Grok-2 in benchmarks?

Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%. Grok-2 scores DocVQA: 93.6%, HumanEval: 88.4%, MMLU: 87.5%, MATH: 76.1%, MMLU-Pro: 75.5%.

Is Claude Opus 4 cheaper than Grok-2?

Grok-2 is 7.5x cheaper for input tokens. Claude Opus 4 costs $15.00/M input and $75.00/M output via anthropic. Grok-2 costs $2.00/M input and $10.00/M output via xai.

What are the context window sizes for Claude Opus 4 and Grok-2?

Claude Opus 4 supports 200K tokens and Grok-2 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4 and Grok-2?

Key differences include context window (200K vs 128K), input pricing ($15.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4 and Grok-2?

Claude Opus 4 is developed by Anthropic and Grok-2 is developed by xAI.