Model Comparison

Grok-1.5 vs Gemini 2.0 Flash ThinkingWhich is better in 2026?

Gemini 2.0 Flash Thinking significantly outperforms across most benchmarks.

Verdict: Grok-1.5 vs Gemini 2.0 Flash Thinking — which is better?

Grok-1.5 (by xAI) and Gemini 2.0 Flash Thinking (by Google) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Grok-1.5 outperforms in 0 benchmarks, while Gemini 2.0 Flash Thinking is better at 2 benchmarks (GPQA, MMMU). Gemini 2.0 Flash Thinking significantly outperforms across most benchmarks.

Choose Grok-1.5 if…

  • you are already invested in the xAI ecosystem

Choose Gemini 2.0 Flash Thinking if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Jan 2025

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Grok-1.5 outperforms in 0 benchmarks, while Gemini 2.0 Flash Thinking is better at 2 benchmarks (GPQA, MMMU).

Gemini 2.0 Flash Thinking significantly outperforms across most benchmarks.

Sun Jul 05 2026 • llm-stats.com

Arena Performance

Human preference votes

Input Capabilities

Supported data types and modalities

Gemini 2.0 Flash Thinking supports multimodal inputs, whereas Grok-1.5 does not.

Gemini 2.0 Flash Thinking can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-1.5

Text
Images
Audio
Video

Gemini 2.0 Flash Thinking

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-1.5

Proprietary

Closed source

Gemini 2.0 Flash Thinking

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Gemini 2.0 Flash Thinking was released on 2025-01-21.

Gemini 2.0 Flash Thinking is 10 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.3 years ago

Gemini 2.0 Flash Thinking

Jan 21, 2025

1.5 years ago

9mo newer

Knowledge Cutoff

When training data ends

Gemini 2.0 Flash Thinking has a documented knowledge cutoff of 2024-08-01, while Grok-1.5's cutoff date is not specified.

We can confirm Gemini 2.0 Flash Thinking's training data extends to 2024-08-01, but cannot make a direct comparison without Grok-1.5's cutoff date.

Grok-1.5

—

Gemini 2.0 Flash Thinking

Aug 2024

Outputs Comparison

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Key Takeaways

xAI

No standout differentiators in the data we have for this pair.

Google
Supports multimodal inputs
Higher GPQA score (74.2% vs 35.9%)
Higher MMMU score (75.4% vs 53.6%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok-1.5 and Gemini 2.0 Flash Thinking side-by-side, then vote on the output you prefer.

Grok-1.5
✓ Preferred
Gemini 2.0 Flash Thinking
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok-1.5
Google
Gemini 2.0 Flash Thinking

FAQ

Common questions about Grok-1.5 vs Gemini 2.0 Flash Thinking.

Which is better, Grok-1.5 or Gemini 2.0 Flash Thinking?

Gemini 2.0 Flash Thinking significantly outperforms across most benchmarks. Grok-1.5 is made by xAI and Gemini 2.0 Flash Thinking is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok-1.5 compare to Gemini 2.0 Flash Thinking in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Gemini 2.0 Flash Thinking scores MMMU: 75.4%, GPQA: 74.2%, AIME 2024: 73.3%.

What are the main differences between Grok-1.5 and Gemini 2.0 Flash Thinking?

Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5 and Gemini 2.0 Flash Thinking?

Grok-1.5 is developed by xAI and Gemini 2.0 Flash Thinking is developed by Google.

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