Model Comparison

Gemini 3 Pro vs Grok-4.20 Beta ReasoningWhich is better in 2026?

Comparing Gemini 3 Pro and Grok-4.20 Beta Reasoning across benchmarks, pricing, and capabilities.

Verdict: Gemini 3 Pro vs Grok-4.20 Beta Reasoning — which is better?

Gemini 3 Pro (by Google) and Grok-4.20 Beta Reasoning (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.

On price, Grok-4.20 Beta Reasoning is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok-4.20 Beta Reasoning also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 3 Pro if…

  • you want predictable pricing at $2.00/M input and $12.00/M output

Choose Grok-4.20 Beta Reasoning if…

  • cost matters — it's about 1.5x cheaper per token
  • you process long inputs — it offers a 2,000,000 token context window
  • you want the most recent training data — it shipped Mar 2026
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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3 Pro and Grok-4.20 Beta Reasoningdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok-4.20 Beta Reasoning costs less

For input processing, Gemini 3 Pro ($2.00/1M tokens) costs the same as Grok-4.20 Beta Reasoning ($2.00/1M tokens).

For output processing, Gemini 3 Pro ($12.00/1M tokens) is 2.0x more expensive than Grok-4.20 Beta Reasoning ($6.00/1M tokens).

In conclusion, Gemini 3 Pro is more expensive than Grok-4.20 Beta Reasoning.*

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

Lowest available price from all providers
Sat Jun 13 2026 • llm-stats.com
Google
Gemini 3 Pro
Input tokens$2.00
Output tokens$12.00
Best providerGoogle
xAI
Grok-4.20 Beta Reasoning
Input tokens$2.00
Output tokens$6.00
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Grok-4.20 Beta Reasoning accepts 2,000,000 input tokens compared to Gemini 3 Pro's 1,048,576 tokens. Gemini 3 Pro can generate longer responses up to 65,536 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.

Google
Gemini 3 Pro
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok-4.20 Beta Reasoning
Input2,000,000 tokens
Output30,000 tokens
Sat Jun 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Pro and Grok-4.20 Beta Reasoning support multimodal inputs.

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

Gemini 3 Pro

Text
Images
Audio
Video

Grok-4.20 Beta Reasoning

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 Pro

Proprietary

Closed source

Grok-4.20 Beta Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while Grok-4.20 Beta Reasoning was released on 2026-03-09.

Grok-4.20 Beta Reasoning is 4 months newer than Gemini 3 Pro.

Gemini 3 Pro

Nov 18, 2025

6 months ago

Grok-4.20 Beta Reasoning

Mar 9, 2026

3 months ago

3mo newer

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a documented knowledge cutoff of 2025-01-31, while Grok-4.20 Beta Reasoning's cutoff date is not specified.

We can confirm Gemini 3 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Grok-4.20 Beta Reasoning's cutoff date.

Gemini 3 Pro

Jan 2025

Grok-4.20 Beta Reasoning

—

Provider Availability

Gemini 3 Pro is available from Google. Grok-4.20 Beta Reasoning is available from xAI.

Gemini 3 Pro

google logo
Google
Input Price:Input: $2.00/1MOutput Price:Output: $12.00/1M

Grok-4.20 Beta Reasoning

xai logo
xAI
Input Price:Input: $2.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google

No standout differentiators in the data we have for this pair.

xAI
Larger context window (2,000,000 tokens)
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3 Pro
xAI
Grok-4.20 Beta Reasoning

FAQ

Common questions about Gemini 3 Pro vs Grok-4.20 Beta Reasoning.

Which is better, Gemini 3 Pro or Grok-4.20 Beta Reasoning?

Gemini 3 Pro (Google) and Grok-4.20 Beta Reasoning (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 Pro compare to Grok-4.20 Beta Reasoning in benchmarks?

Gemini 3 Pro scores AIME 2025: 100.0%, Vending-Bench 2: 100.0%, Global PIQA: 93.4%, GPQA: 91.9%, MMMLU: 91.8%.

Is Gemini 3 Pro cheaper than Grok-4.20 Beta Reasoning?

Both models cost $2.00 per million input tokens.

What are the context window sizes for Gemini 3 Pro and Grok-4.20 Beta Reasoning?

Gemini 3 Pro supports 1.0M tokens and Grok-4.20 Beta Reasoning 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 Pro and Grok-4.20 Beta Reasoning?

Key differences include context window (1.0M vs 2.0M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3 Pro and Grok-4.20 Beta Reasoning?

Gemini 3 Pro is developed by Google and Grok-4.20 Beta Reasoning is developed by xAI.

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