Model Comparison

Grok-1.5 vs Gemini 1.5 Flash

Gemini 1.5 Flash shows notably better performance in the majority of benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

8 benchmarks

Grok-1.5 outperforms in 2 benchmarks (GSM8k, MMLU), while Gemini 1.5 Flash is better at 6 benchmarks (GPQA, HumanEval, MATH, MathVista, MMLU-Pro, MMMU).

Gemini 1.5 Flash shows notably better performance in the majority of benchmarks.

Wed Apr 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Cost data unavailable.

Lowest available price from all providers
Wed Apr 22 2026 • llm-stats.com
xAI
Grok-1.5
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
Google
Gemini 1.5 Flash
Input tokens$0.15
Output tokens$0.60
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

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

xAI
Grok-1.5
Input- tokens
Output- tokens
Google
Gemini 1.5 Flash
Input1,048,576 tokens
Output8,192 tokens
Wed Apr 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

Gemini 1.5 Flash 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

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

Proprietary

Closed source

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Gemini 1.5 Flash was released on 2024-05-01.

Gemini 1.5 Flash is 1 month newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.1 years ago

Gemini 1.5 Flash

May 1, 2024

2.0 years ago

1mo newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash has a documented knowledge cutoff of 2023-11-01, while Grok-1.5'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-1.5's cutoff date.

Grok-1.5

—

Gemini 1.5 Flash

Nov 2023

Outputs Comparison

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Key Takeaways

xAI
Higher GSM8k score (90.0% vs 86.2%)
Higher MMLU score (81.3% vs 78.9%)
Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Higher GPQA score (51.0% vs 35.9%)
Higher HumanEval score (74.3% vs 74.1%)
Higher MATH score (77.9% vs 50.6%)
Higher MathVista score (65.8% vs 52.8%)
Higher MMLU-Pro score (67.3% vs 51.0%)
Higher MMMU score (62.3% vs 53.6%)
xAIGrok-1.5
GoogleGemini 1.5 Flash
Compare in Playground

Detailed Comparison

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

FAQ

Common questions about Grok-1.5 vs Gemini 1.5 Flash

Gemini 1.5 Flash shows notably better performance in the majority of benchmarks. Grok-1.5 is made by xAI and Gemini 1.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Gemini 1.5 Flash scores XSTest: 97.0%, HellaSwag: 86.5%, GSM8k: 86.2%, BIG-Bench Hard: 85.5%, MGSM: 82.6%.
Grok-1.5 supports an unknown number of tokens and Gemini 1.5 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.
Grok-1.5 is developed by xAI and Gemini 1.5 Flash is developed by Google.