Model Comparison

Gemini 3.1 Pro vs Grok Code Fast 1Which is better in 2026?

Gemini 3.1 Pro significantly outperforms across most benchmarks. Grok Code Fast 1 is 10.7x cheaper per token.

Verdict: Gemini 3.1 Pro vs Grok Code Fast 1 — which is better?

Gemini 3.1 Pro (by Google) and Grok Code Fast 1 (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 3.1 Pro outperforms in 1 benchmarks (SWE-Bench Verified), while Grok Code Fast 1 is better at 0 benchmarks. Gemini 3.1 Pro significantly outperforms across most benchmarks.

On price, Grok Code Fast 1 is roughly 10.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 3.1 Pro also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 3.1 Pro if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Feb 2026

Choose Grok Code Fast 1 if…

  • cost matters — it's about 10.7x cheaper per token
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Gemini 3.1 Pro outperforms in 1 benchmarks (SWE-Bench Verified), while Grok Code Fast 1 is better at 0 benchmarks.

Gemini 3.1 Pro significantly outperforms across most benchmarks.

Sun Jun 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok Code Fast 1 costs less

For input processing, Gemini 3.1 Pro ($2.50/1M tokens) is 12.5x more expensive than Grok Code Fast 1 ($0.20/1M tokens).

For output processing, Gemini 3.1 Pro ($15.00/1M tokens) is 10.0x more expensive than Grok Code Fast 1 ($1.50/1M tokens).

In conclusion, Gemini 3.1 Pro is more expensive than Grok Code Fast 1.*

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

Lowest available price from all providers
Sun Jun 07 2026 • llm-stats.com
Google
Gemini 3.1 Pro
Input tokens$2.50
Output tokens$15.00
Best providerGoogle
xAI
Grok Code Fast 1
Input tokens$0.20
Output tokens$1.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3.1 Pro accepts 1,048,576 input tokens compared to Grok Code Fast 1's 256,000 tokens. Gemini 3.1 Pro can generate longer responses up to 65,536 tokens, while Grok Code Fast 1 is limited to 10,000 tokens.

Google
Gemini 3.1 Pro
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok Code Fast 1
Input256,000 tokens
Output10,000 tokens
Sun Jun 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 3.1 Pro supports multimodal inputs, whereas Grok Code Fast 1 does not.

Gemini 3.1 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3.1 Pro

Text
Images
Audio
Video

Grok Code Fast 1

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 3.1 Pro

Proprietary

Closed source

Grok Code Fast 1

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.1 Pro was released on 2026-02-19, while Grok Code Fast 1 was released on 2025-08-28.

Gemini 3.1 Pro is 6 months newer than Grok Code Fast 1.

Gemini 3.1 Pro

Feb 19, 2026

3 months ago

5mo newer
Grok Code Fast 1

Aug 28, 2025

9 months ago

Knowledge Cutoff

When training data ends

Gemini 3.1 Pro has a documented knowledge cutoff of 2025-01-31, while Grok Code Fast 1's cutoff date is not specified.

We can confirm Gemini 3.1 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Grok Code Fast 1's cutoff date.

Gemini 3.1 Pro

Jan 2025

Grok Code Fast 1

—

Provider Availability

Gemini 3.1 Pro is available from Google. Grok Code Fast 1 is available from xAI.

Gemini 3.1 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

Grok Code Fast 1

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $1.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Higher SWE-Bench Verified score (80.6% vs 70.8%)
xAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3.1 Pro
xAI
Grok Code Fast 1

FAQ

Common questions about Gemini 3.1 Pro vs Grok Code Fast 1.

Which is better, Gemini 3.1 Pro or Grok Code Fast 1?

Gemini 3.1 Pro significantly outperforms across most benchmarks. Gemini 3.1 Pro is made by Google and Grok Code Fast 1 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3.1 Pro compare to Grok Code Fast 1 in benchmarks?

Gemini 3.1 Pro scores t2-bench: 99.3%, LiveCodeBench Pro: 96.2%, GPQA: 94.3%, MMMLU: 92.6%, BrowseComp: 85.9%. Grok Code Fast 1 scores SWE-Bench Verified: 70.8%.

Is Gemini 3.1 Pro cheaper than Grok Code Fast 1?

Grok Code Fast 1 is 12.5x cheaper for input tokens. Gemini 3.1 Pro costs $2.50/M input and $15.00/M output via google. Grok Code Fast 1 costs $0.20/M input and $1.50/M output via xai.

What are the context window sizes for Gemini 3.1 Pro and Grok Code Fast 1?

Gemini 3.1 Pro supports 1.0M tokens and Grok Code Fast 1 supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.1 Pro and Grok Code Fast 1?

Key differences include context window (1.0M vs 256K), input pricing ($2.50 vs $0.20/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.1 Pro and Grok Code Fast 1?

Gemini 3.1 Pro is developed by Google and Grok Code Fast 1 is developed by xAI.

Related comparisons