Model Comparison

Grok-3 vs Gemini 2.5 Flash

Grok-3 shows notably better performance in the majority of benchmarks. Gemini 2.5 Flash is 7.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Grok-3 outperforms in 3 benchmarks (AIME 2024, AIME 2025, GPQA), while Gemini 2.5 Flash is better at 1 benchmark (MMMU).

Grok-3 shows notably better performance in the majority of benchmarks.

Thu Apr 16 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash costs less

For input processing, Grok-3 ($3.00/1M tokens) is 10.0x more expensive than Gemini 2.5 Flash ($0.30/1M tokens).

For output processing, Grok-3 ($15.00/1M tokens) is 6.0x more expensive than Gemini 2.5 Flash ($2.50/1M tokens).

In conclusion, Grok-3 is more expensive than Gemini 2.5 Flash.*

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

Lowest available price from all providers
Thu Apr 16 2026 • llm-stats.com
xAI
Grok-3
Input tokens$3.00
Output tokens$15.00
Best providerxAI
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
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Context Window

Maximum input and output token capacity

Gemini 2.5 Flash accepts 1,048,576 input tokens compared to Grok-3's 128,000 tokens. Gemini 2.5 Flash can generate longer responses up to 65,536 tokens, while Grok-3 is limited to 8,000 tokens.

xAI
Grok-3
Input128,000 tokens
Output8,000 tokens
Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
Thu Apr 16 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok-3 and Gemini 2.5 Flash support multimodal inputs.

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

Grok-3

Text
Images
Audio
Video

Gemini 2.5 Flash

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-3

Proprietary

Closed source

Gemini 2.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-3 was released on 2025-02-17, while Gemini 2.5 Flash was released on 2025-05-20.

Gemini 2.5 Flash is 3 months newer than Grok-3.

Grok-3

Feb 17, 2025

1.2 years ago

Gemini 2.5 Flash

May 20, 2025

11 months ago

3mo newer

Knowledge Cutoff

When training data ends

Grok-3 has a knowledge cutoff of 2024-11-17, while Gemini 2.5 Flash has a cutoff of 2025-01-31.

Gemini 2.5 Flash has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to Grok-3 (2024-11-17).

Grok-3

Nov 2024

Gemini 2.5 Flash

Jan 2025

2 mo newer

Provider Availability

Grok-3 is available from xAI. Gemini 2.5 Flash is available from Google.

Grok-3

xai logo
xAI
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

Gemini 2.5 Flash

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

xAI
Higher AIME 2024 score (93.3% vs 88.0%)
Higher AIME 2025 score (93.3% vs 72.0%)
Higher GPQA score (84.6% vs 82.8%)
Google
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Higher MMMU score (79.7% vs 78.0%)
xAIGrok-3
GoogleGemini 2.5 Flash
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Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok-3
Google
Gemini 2.5 Flash

FAQ

Common questions about Grok-3 vs Gemini 2.5 Flash

Grok-3 shows notably better performance in the majority of benchmarks. Grok-3 is made by xAI and Gemini 2.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Grok-3 scores AIME 2024: 93.3%, AIME 2025: 93.3%, GPQA: 84.6%, LiveCodeBench: 79.4%, MMMU: 78.0%. Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%.
Gemini 2.5 Flash is 10.0x cheaper for input tokens. Grok-3 costs $3.00/M input and $15.00/M output via xai. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google.
Grok-3 supports 128K tokens and Gemini 2.5 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (128K vs 1.0M), input pricing ($3.00 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.
Grok-3 is developed by xAI and Gemini 2.5 Flash is developed by Google.