Model Comparison

Gemini 1.5 Flash 8B vs Grok-1.5Which is better in 2026?

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks.

Verdict: Gemini 1.5 Flash 8B vs Grok-1.5 — which is better?

Gemini 1.5 Flash 8B (by Google) and Grok-1.5 (by xAI) 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.

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

Choose Gemini 1.5 Flash 8B if…

  • you want the strongest raw capability — it leads on 5 of 5 shared benchmarks

Choose Grok-1.5 if…

  • you want the most recent training data — it shipped Mar 2024
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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

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

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks.

Sat Jun 13 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).

Google
Gemini 1.5 Flash 8B
Input1,048,576 tokens
Output8,192 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Sat Jun 13 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.

Gemini 1.5 Flash 8B

Text
Images
Audio
Video

Grok-1.5

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.

Gemini 1.5 Flash 8B

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Gemini 1.5 Flash 8B

Mar 15, 2024

2.2 years ago

Grok-1.5

Mar 28, 2024

2.2 years ago

1w newer

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.

Gemini 1.5 Flash 8B

Oct 2024

Grok-1.5

—

Outputs Comparison

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Key Takeaways

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%)
xAI

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

GoogleGemini 1.5 Flash 8B
xAIGrok-1.5
Compare in Playground

Detailed Comparison

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

FAQ

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

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

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks. Gemini 1.5 Flash 8B is made by Google and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 1.5 Flash 8B compare to Grok-1.5 in benchmarks?

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

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

Gemini 1.5 Flash 8B supports 1.0M tokens and Grok-1.5 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 Gemini 1.5 Flash 8B and Grok-1.5?

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

Who makes Gemini 1.5 Flash 8B and Grok-1.5?

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

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