Model Comparison

Gemini 1.5 Flash vs Grok-2

Grok-2 significantly outperforms across most benchmarks. Gemini 1.5 Flash is 15.2x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Gemini 1.5 Flash outperforms in 1 benchmarks (MATH), while Grok-2 is better at 6 benchmarks (GPQA, HumanEval, MathVista, MMLU, MMLU-Pro, MMMU).

Grok-2 significantly outperforms across most benchmarks.

Fri Apr 10 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Flash costs less

For input processing, Gemini 1.5 Flash ($0.15/1M tokens) is 13.3x cheaper than Grok-2 ($2.00/1M tokens).

For output processing, Gemini 1.5 Flash ($0.60/1M tokens) is 16.7x cheaper than Grok-2 ($10.00/1M tokens).

In conclusion, Grok-2 is more expensive than Gemini 1.5 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Apr 10 2026 • llm-stats.com
Google
Gemini 1.5 Flash
Input tokens$0.15
Output tokens$0.60
Best providerGoogle
xAI
Grok-2
Input tokens$2.00
Output tokens$10.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 1.5 Flash accepts 1,048,576 input tokens compared to Grok-2's 128,000 tokens. Gemini 1.5 Flash can generate longer responses up to 8,192 tokens, while Grok-2 is limited to 8,000 tokens.

Google
Gemini 1.5 Flash
Input1,048,576 tokens
Output8,192 tokens
xAI
Grok-2
Input128,000 tokens
Output8,000 tokens
Fri Apr 10 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 1.5 Flash and Grok-2 support multimodal inputs.

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

Gemini 1.5 Flash

Text
Images
Audio
Video

Grok-2

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

Proprietary

Closed source

Grok-2

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash was released on 2024-05-01, while Grok-2 was released on 2024-08-13.

Grok-2 is 3 months newer than Gemini 1.5 Flash.

Gemini 1.5 Flash

May 1, 2024

1.9 years ago

Grok-2

Aug 13, 2024

1.7 years ago

3mo newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash has a documented knowledge cutoff of 2023-11-01, while Grok-2's cutoff date is not specified.

We can confirm Gemini 1.5 Flash's training data extends to 2023-11-01, but cannot make a direct comparison without Grok-2's cutoff date.

Gemini 1.5 Flash

Nov 2023

Grok-2

—

Provider Availability

Gemini 1.5 Flash is available from Google. Grok-2 is available from xAI.

Gemini 1.5 Flash

google logo
Google
Input Price:Input: $0.15/1MOutput Price:Output: $0.60/1M

Grok-2

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Higher MATH score (77.9% vs 76.1%)
xAI
Higher GPQA score (56.0% vs 51.0%)
Higher HumanEval score (88.4% vs 74.3%)
Higher MathVista score (69.0% vs 65.8%)
Higher MMLU score (87.5% vs 78.9%)
Higher MMLU-Pro score (75.5% vs 67.3%)
Higher MMMU score (66.1% vs 62.3%)
GoogleGemini 1.5 Flash
xAIGrok-2
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Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 1.5 Flash
xAI
Grok-2

FAQ

Common questions about Gemini 1.5 Flash vs Grok-2

Grok-2 significantly outperforms across most benchmarks. Gemini 1.5 Flash is made by Google and Grok-2 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 1.5 Flash scores XSTest: 97.0%, HellaSwag: 86.5%, GSM8k: 86.2%, BIG-Bench Hard: 85.5%, MGSM: 82.6%. Grok-2 scores DocVQA: 93.6%, HumanEval: 88.4%, MMLU: 87.5%, MATH: 76.1%, MMLU-Pro: 75.5%.
Gemini 1.5 Flash is 13.3x cheaper for input tokens. Gemini 1.5 Flash costs $0.15/M input and $0.60/M output via google. Grok-2 costs $2.00/M input and $10.00/M output via xai.
Gemini 1.5 Flash supports 1.0M tokens and Grok-2 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 128K), input pricing ($0.15 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.
Gemini 1.5 Flash is developed by Google and Grok-2 is developed by xAI.