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Claude Sonnet 5.5 vs Grok-2 mini

Claude Sonnet 5.5 leads the LLM Stats Score 58.1 to 8.6.

Anthropic · xAI · Updated for 2026

Which is better?

Claude Sonnet 5.5 leads the overall LLM Stats Score 58.1 to 8.6, ranking #3 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Sonnet 5.5

  • overall performance matters — it scores 58.1 and ranks #3 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Grok-2 mini

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

Claude Sonnet 5.5
Anthropic
Grok-2 mini
xAI
Core performance indexes
LLM Stats Score
58.1
#3
8.6
#284
Reasoning
56.6
#3
8.2
#281
Coding
48.9
#2
5.9
#201
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Sonnet 5.5
Grok-2 mini
Math
36.9#34
15.8#213
Vision
40.1#3
5.8#155
Multimodal
40.2#2
9.0#127
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

47 reported for Claude Sonnet 5.5 · 8 for Grok-2 mini

No common benchmarks found

Claude Sonnet 5.5 and Grok-2 minidon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Sonnet 5.5 specifies input context (1,000,000 tokens). Only Claude Sonnet 5.5 specifies output context (128,000 tokens).

Anthropic
Claude Sonnet 5.5
Input1,000,000 tokens
Output128,000 tokens
xAI
Grok-2 mini
Input- tokens
Output- tokens
Tue Sep 29 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Sonnet 5.5 and Grok-2 mini support multimodal inputs.

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

Claude Sonnet 5.5

Text
Images
Audio
Video

Grok-2 mini

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 Sonnet 5.5

Proprietary

Closed source

Grok-2 mini

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 5.5 was released on 2026-09-28, while Grok-2 mini was released on 2024-08-13.

Claude Sonnet 5.5 is 26 months newer than Grok-2 mini.

Claude Sonnet 5.5

Sep 28, 2026

1 days ago

2.1yr newer
Grok-2 mini

Aug 13, 2024

2.1 years ago

Knowledge Cutoff

When training data ends

Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Grok-2 mini's cutoff date is not specified.

We can confirm Claude Sonnet 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Grok-2 mini's cutoff date.

Claude Sonnet 5.5

Jun 2026

Grok-2 mini

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Sonnet 5.5 and Grok-2 mini side-by-side, then vote on the output you prefer.

Claude Sonnet 5.5
✓ Preferred
Grok-2 mini
Open in Playground

FAQ

Common questions about Claude Sonnet 5.5 vs Grok-2 mini.

Which is better, Claude Sonnet 5.5 or Grok-2 mini?

Claude Sonnet 5.5 leads the LLM Stats Score 58.1 to 8.6. Claude Sonnet 5.5 is made by Anthropic and Grok-2 mini is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Sonnet 5.5 compare to Grok-2 mini in benchmarks?

Claude Sonnet 5.5 scores BenchCAD (with Python tool): 96.3%, ArXivMath (with tools): 95.2%, Global-MMLU: 92.1%, MILU: 91.6%, SWE-bench Multilingual: 90.3%. Grok-2 mini scores DocVQA: 93.2%, MMLU: 86.2%, HumanEval: 85.7%, MATH: 73.0%, MMLU-Pro: 72.0%.

What are the context window sizes for Claude Sonnet 5.5 and Grok-2 mini?

Claude Sonnet 5.5 supports 1.0M tokens and Grok-2 mini supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Sonnet 5.5 and Grok-2 mini?

Key differences include LLM Stats Score (58.1 vs 8.6). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 5.5 and Grok-2 mini?

Claude Sonnet 5.5 is developed by Anthropic and Grok-2 mini is developed by xAI.

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