Model Comparison

Grok-3 vs Claude Opus 4

Grok-3 significantly outperforms across most benchmarks. Grok-3 is 5.0x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok-3 outperforms in 2 benchmarks (AIME 2025, GPQA), while Claude Opus 4 is better at 0 benchmarks.

Grok-3 significantly outperforms across most benchmarks.

Sat Apr 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-3 costs less

For input processing, Grok-3 ($3.00/1M tokens) is 5.0x cheaper than Claude Opus 4 ($15.00/1M tokens).

For output processing, Grok-3 ($15.00/1M tokens) is 5.0x cheaper than Claude Opus 4 ($75.00/1M tokens).

In conclusion, Claude Opus 4 is more expensive than Grok-3.*

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

Lowest available price from all providers
Sat Apr 18 2026 • llm-stats.com
xAI
Grok-3
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Anthropic
Claude Opus 4
Input tokens$15.00
Output tokens$75.00
Best providerAnthropic
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-3's 128,000 tokens. Claude Opus 4 can generate longer responses up to 32,000 tokens, while Grok-3 is limited to 8,000 tokens.

xAI
Grok-3
Input128,000 tokens
Output8,000 tokens
Anthropic
Claude Opus 4
Input200,000 tokens
Output32,000 tokens
Sat Apr 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-3 and Claude Opus 4 support multimodal inputs.

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

Grok-3

Text
Images
Audio
Video

Claude Opus 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.

Grok-3

Proprietary

Closed source

Claude Opus 4

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-3 was released on 2025-02-17, while Claude Opus 4 was released on 2025-05-22.

Claude Opus 4 is 3 months newer than Grok-3.

Grok-3

Feb 17, 2025

1.2 years ago

Claude Opus 4

May 22, 2025

11 months ago

3mo newer

Knowledge Cutoff

When training data ends

Grok-3 has a documented knowledge cutoff of 2024-11-17, while Claude Opus 4's cutoff date is not specified.

We can confirm Grok-3's training data extends to 2024-11-17, but cannot make a direct comparison without Claude Opus 4's cutoff date.

Grok-3

Nov 2024

Claude Opus 4

—

Provider Availability

Grok-3 is available from xAI. Claude Opus 4 is available from Anthropic, Bedrock, Google.

Grok-3

xai logo
xAI
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

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
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

xAI
Less expensive input tokens
Less expensive output tokens
Higher AIME 2025 score (93.3% vs 75.5%)
Higher GPQA score (84.6% vs 79.6%)
Anthropic
Larger context window (200,000 tokens)
xAIGrok-3
AnthropicClaude Opus 4
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-3
Anthropic
Claude Opus 4

FAQ

Common questions about Grok-3 vs Claude Opus 4

Grok-3 significantly outperforms across most benchmarks. Grok-3 is made by xAI and Claude Opus 4 is made by Anthropic. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Grok-3 scores AIME 2024: 93.3%, AIME 2025: 93.3%, GPQA: 84.6%, LiveCodeBench: 79.4%, MMMU: 78.0%. Claude Opus 4 scores MMMLU: 88.8%, TAU-bench Retail: 81.4%, GPQA: 79.6%, MMMU (validation): 76.5%, AIME 2025: 75.5%.
Grok-3 is 5.0x cheaper for input tokens. Grok-3 costs $3.00/M input and $15.00/M output via xai. Claude Opus 4 costs $15.00/M input and $75.00/M output via anthropic.
Grok-3 supports 128K tokens and Claude Opus 4 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (128K vs 200K), input pricing ($3.00 vs $15.00/M). See the full comparison above for benchmark-by-benchmark results.
Grok-3 is developed by xAI and Claude Opus 4 is developed by Anthropic.