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Gemini 3.7 Flash vs Grok 4 Fast

Comparing Gemini 3.7 Flash and Grok 4 Fast across benchmarks, pricing, and capabilities.

Google · xAI · Updated for 2026

Which is better?

Gemini 3.7 Flash and Grok 4 Fast trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Grok 4 Fast is roughly 5.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok 4 Fast also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Gemini 3.7 Flash

  • you want the most recent training data — it shipped Aug 2026

Choose Grok 4 Fast

  • cost matters — it's about 5.5x cheaper per token
  • you process long inputs — it offers a 2,000,000 token context window

At a glance

The differences that matter most.

Gemini 3.7 Flash
Google
Grok 4 Fast
xAI
Benchmark wins
—
—
Input price
$0.75 / M
$0.20 / M
Output price
$3.75 / M
$0.50 / M
Context window
1,048,576
2,000,000
Released
Aug 2026
Aug 2025
License
Proprietary
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.7 Flash and Grok 4 Fastdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

Grok 4 Fast costs less

For input processing, Gemini 3.7 Flash ($0.75/1M tokens) is 3.8x more expensive than Grok 4 Fast ($0.20/1M tokens).

For output processing, Gemini 3.7 Flash ($3.75/1M tokens) is 7.5x more expensive than Grok 4 Fast ($0.50/1M tokens).

In conclusion, Gemini 3.7 Flash is more expensive than Grok 4 Fast.*

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

Lowest available price from all providers
Tue Aug 25 2026 • llm-stats.com
Google
Gemini 3.7 Flash
Input tokens$0.75
Output tokens$3.75
Best providerGoogle
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok 4 Fast accepts 2,000,000 input tokens compared to Gemini 3.7 Flash's 1,048,576 tokens. Gemini 3.7 Flash can generate longer responses up to 65,536 tokens, while Grok 4 Fast is limited to 30,000 tokens.

Google
Gemini 3.7 Flash
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Tue Aug 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.7 Flash and Grok 4 Fast support multimodal inputs.

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

Gemini 3.7 Flash

Text
Images
Audio
Video

Grok 4 Fast

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 3.7 Flash

Proprietary

Closed source

Grok 4 Fast

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.7 Flash was released on 2026-08-13, while Grok 4 Fast was released on 2025-08-28.

Gemini 3.7 Flash is 12 months newer than Grok 4 Fast.

Gemini 3.7 Flash

Aug 13, 2026

1 weeks ago

11mo newer
Grok 4 Fast

Aug 28, 2025

12 months ago

Knowledge Cutoff

When training data ends

Gemini 3.7 Flash has a documented knowledge cutoff of 2026-03-31, while Grok 4 Fast's cutoff date is not specified.

We can confirm Gemini 3.7 Flash's training data extends to 2026-03-31, but cannot make a direct comparison without Grok 4 Fast's cutoff date.

Gemini 3.7 Flash

Mar 2026

Grok 4 Fast

—

Provider Availability

Gemini 3.7 Flash is available from Google. Grok 4 Fast is available from xAI.

Gemini 3.7 Flash

google logo
Google
Input Price:Input: $0.75/1MOutput Price:Output: $3.75/1M

Grok 4 Fast

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 3.7 Flash and Grok 4 Fast side-by-side, then vote on the output you prefer.

Gemini 3.7 Flash
✓ Preferred
Grok 4 Fast
Open in Playground

FAQ

Common questions about Gemini 3.7 Flash vs Grok 4 Fast.

Which is better, Gemini 3.7 Flash or Grok 4 Fast?

Gemini 3.7 Flash (Google) and Grok 4 Fast (xAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Gemini 3.7 Flash compare to Grok 4 Fast in benchmarks?

Gemini 3.7 Flash scores MRCR v2 (8-needle): 97.0%, Harvey LAB-AA: 90.7%, CharXiv-R: 88.7%, Terminal-Bench 2.1: 85.8%, LVBench: 85.4%. Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%.

Is Gemini 3.7 Flash cheaper than Grok 4 Fast?

Grok 4 Fast is 3.8x cheaper for input tokens. Gemini 3.7 Flash costs $0.75/M input and $3.75/M output via google. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai.

What are the context window sizes for Gemini 3.7 Flash and Grok 4 Fast?

Gemini 3.7 Flash supports 1.0M tokens and Grok 4 Fast supports 2.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.7 Flash and Grok 4 Fast?

Key differences include context window (1.0M vs 2.0M), input pricing ($0.75 vs $0.20/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.7 Flash and Grok 4 Fast?

Gemini 3.7 Flash is developed by Google and Grok 4 Fast is developed by xAI.

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