The AI arena is free today

Open Superagent

Claude Opus 4.5 vs Grok-1.5V

Claude Opus 4.5 leads the LLM Stats Score 38.3 to -0.7.

Anthropic · xAI · Updated for 2026

Which is better?

Claude Opus 4.5 leads the overall LLM Stats Score 38.3 to -0.7, ranking #63 overall.

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

Choose Claude Opus 4.5

  • overall performance matters — it scores 38.3 and ranks #63 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Nov 2025

Choose Grok-1.5V

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

Claude Opus 4.5
Anthropic
Grok-1.5V
xAI
Core performance indexes
LLM Stats Score
38.3
#63
-0.7
#320
Reasoning
40.2
#50
0.0
#306
Cost, coverage & limits
Benchmark wins
—
—
Input price
$5.00 / M
— / M
Output price
$25.00 / M
— / M
Context window
200,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Opus 4.5
Grok-1.5V
Vision
20.4#65
-1.2#182
Multimodal
18.9#69
1.2#147
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for Claude Opus 4.5 · 7 for Grok-1.5V

No common benchmarks found

Claude Opus 4.5 and Grok-1.5Vdon'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 Opus 4.5 specifies input context (200,000 tokens). Only Claude Opus 4.5 specifies output context (64,000 tokens).

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
xAI
Grok-1.5V
Input- tokens
Output- tokens
Sun Sep 06 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 4.5 and Grok-1.5V support multimodal inputs.

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

Claude Opus 4.5

Text
Images
Audio
Video

Grok-1.5V

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 4.5

Proprietary

Closed source

Grok-1.5V

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Grok-1.5V was released on 2024-04-12.

Claude Opus 4.5 is 20 months newer than Grok-1.5V.

Claude Opus 4.5

Nov 24, 2025

9 months ago

1.6yr newer
Grok-1.5V

Apr 12, 2024

2.4 years ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Grok-1.5V's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Grok-1.5V's cutoff date.

Claude Opus 4.5

Mar 2025

Grok-1.5V

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Opus 4.5 and Grok-1.5V side-by-side, then vote on the output you prefer.

Claude Opus 4.5
✓ Preferred
Grok-1.5V
Open in Playground

FAQ

Common questions about Claude Opus 4.5 vs Grok-1.5V.

Which is better, Claude Opus 4.5 or Grok-1.5V?

Claude Opus 4.5 leads the LLM Stats Score 38.3 to -0.7. Claude Opus 4.5 is made by Anthropic and Grok-1.5V 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 Opus 4.5 compare to Grok-1.5V in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. Grok-1.5V scores AI2D: 88.3%, DocVQA: 85.6%, TextVQA: 78.1%, ChartQA: 76.1%, RealWorldQA: 68.7%.

What are the context window sizes for Claude Opus 4.5 and Grok-1.5V?

Claude Opus 4.5 supports 200K tokens and Grok-1.5V 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 Opus 4.5 and Grok-1.5V?

Key differences include LLM Stats Score (38.3 vs -0.7). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and Grok-1.5V?

Claude Opus 4.5 is developed by Anthropic and Grok-1.5V is developed by xAI.

Related comparisons