Model Comparison

Grok-1.5 vs Gemini 1.5 Flash 8B

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Grok-1.5 outperforms in 0 benchmarks, while Gemini 1.5 Flash 8B is better at 5 benchmarks (GPQA, MATH, MathVista, MMLU-Pro, MMMU).

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks.

Sat May 02 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Gemini 1.5 Flash 8B specifies input context (1,048,576 tokens). Only Gemini 1.5 Flash 8B specifies output context (8,192 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
Google
Gemini 1.5 Flash 8B
Input1,048,576 tokens
Output8,192 tokens
Sat May 02 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 1.5 Flash 8B supports multimodal inputs, whereas Grok-1.5 does not.

Gemini 1.5 Flash 8B 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 1.5 Flash 8B

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 1.5 Flash 8B

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Gemini 1.5 Flash 8B was released on 2024-03-15.

Grok-1.5 is 0 month newer than Gemini 1.5 Flash 8B.

Grok-1.5

Mar 28, 2024

2.1 years ago

1w newer
Gemini 1.5 Flash 8B

Mar 15, 2024

2.1 years ago

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash 8B has a documented knowledge cutoff of 2024-10-01, while Grok-1.5's cutoff date is not specified.

We can confirm Gemini 1.5 Flash 8B's training data extends to 2024-10-01, but cannot make a direct comparison without Grok-1.5's cutoff date.

Grok-1.5

—

Gemini 1.5 Flash 8B

Oct 2024

Outputs Comparison

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Key Takeaways

xAI

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

Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Higher GPQA score (38.4% vs 35.9%)
Higher MATH score (58.7% vs 50.6%)
Higher MathVista score (54.7% vs 52.8%)
Higher MMLU-Pro score (58.7% vs 51.0%)
Higher MMMU score (53.7% vs 53.6%)
xAIGrok-1.5
GoogleGemini 1.5 Flash 8B
Compare in Playground

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-1.5
Google
Gemini 1.5 Flash 8B

FAQ

Common questions about Grok-1.5 vs Gemini 1.5 Flash 8B.

Which is better, Grok-1.5 or Gemini 1.5 Flash 8B?

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks. Grok-1.5 is made by xAI and Gemini 1.5 Flash 8B 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 1.5 Flash 8B in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Gemini 1.5 Flash 8B scores XSTest: 92.6%, FLEURS: 86.4%, Natural2Code: 75.5%, WMT23: 72.6%, Video-MME: 66.2%.

What are the context window sizes for Grok-1.5 and Gemini 1.5 Flash 8B?

Grok-1.5 supports an unknown number of tokens and Gemini 1.5 Flash 8B supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-1.5 and Gemini 1.5 Flash 8B?

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 1.5 Flash 8B?

Grok-1.5 is developed by xAI and Gemini 1.5 Flash 8B is developed by Google.