Model Comparison

Claude Opus 4 vs Grok-4

Grok-4 significantly outperforms across most benchmarks. Grok-4 is 5.0x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Claude Opus 4 outperforms in 0 benchmarks, while Grok-4 is better at 3 benchmarks (AIME 2025, ARC-AGI v2, GPQA).

Grok-4 significantly outperforms across most benchmarks.

Wed Apr 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-4 costs less

For input processing, Claude Opus 4 ($15.00/1M tokens) is 5.0x more expensive than Grok-4 ($3.00/1M tokens).

For output processing, Claude Opus 4 ($75.00/1M tokens) is 5.0x more expensive than Grok-4 ($15.00/1M tokens).

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

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

Lowest available price from all providers
Wed Apr 22 2026 • llm-stats.com
Anthropic
Claude Opus 4
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
xAI
Grok-4
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok-4 accepts 256,000 input tokens compared to Claude Opus 4's 200,000 tokens. Claude Opus 4 can generate longer responses up to 32,000 tokens, while Grok-4 is limited to 8,000 tokens.

Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
xAI
Grok-4
Input256,000 tokens
Output8,000 tokens
Wed Apr 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4 and Grok-4 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-4

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-4

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4 was released on 2025-05-22, while Grok-4 was released on 2025-07-09.

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

Claude Opus 4

May 22, 2025

11 months ago

Grok-4

Jul 9, 2025

9 months ago

1mo newer

Knowledge Cutoff

When training data ends

Grok-4 has a documented knowledge cutoff of 2024-12-31, while Claude Opus 4's cutoff date is not specified.

We can confirm Grok-4's training data extends to 2024-12-31, but cannot make a direct comparison without Claude Opus 4's cutoff date.

Claude Opus 4

—

Grok-4

Dec 2024

Provider Availability

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

xai logo
xAI
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
xAI
Larger context window (256,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher AIME 2025 score (91.7% vs 75.5%)
Higher ARC-AGI v2 score (15.9% vs 8.6%)
Higher GPQA score (87.5% vs 79.6%)
AnthropicClaude Opus 4
xAIGrok-4
Compare in Playground

Detailed Comparison

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

FAQ

Common questions about Claude Opus 4 vs Grok-4

Grok-4 significantly outperforms across most benchmarks. Claude Opus 4 is made by Anthropic and Grok-4 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%. Grok-4 scores AIME 2025: 91.7%, HMMT25: 90.0%, GPQA: 87.5%, LiveCodeBench: 79.0%, Humanity's Last Exam: 40.0%.
Grok-4 is 5.0x cheaper for input tokens. Claude Opus 4 costs $15.00/M input and $75.00/M output via anthropic. Grok-4 costs $3.00/M input and $15.00/M output via xai.
Claude Opus 4 supports 200K tokens and Grok-4 supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (200K vs 256K), input pricing ($15.00 vs $3.00/M). See the full comparison above for benchmark-by-benchmark results.
Claude Opus 4 is developed by Anthropic and Grok-4 is developed by xAI.