Model Comparison

Gemini 3.6 Flash vs Grok-4.20 Beta ReasoningWhich is better in 2026?

Comparing Gemini 3.6 Flash and Grok-4.20 Beta Reasoning across benchmarks, pricing, and capabilities.

Verdict: Gemini 3.6 Flash vs Grok-4.20 Beta Reasoning — which is better?

Gemini 3.6 Flash (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.

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 3.6 Flash if…

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

Choose Grok-4.20 Beta Reasoning if…

  • you process long inputs — it offers a 2,000,000 token context window

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Gemini 3.6 Flash 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

For input processing, Gemini 3.6 Flash ($1.50/1M tokens) is 1.3x cheaper than Grok-4.20 Beta Reasoning ($2.00/1M tokens).

For output processing, Gemini 3.6 Flash ($7.50/1M tokens) is 1.3x more expensive than Grok-4.20 Beta Reasoning ($6.00/1M tokens).

In conclusion, Gemini 3.6 Flash and Grok-4.20 Beta Reasoning cost the same.*

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

Lowest available price from all providers
Wed Jul 29 2026 • llm-stats.com
Google
Gemini 3.6 Flash
Input tokens$1.50
Output tokens$7.50
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 3.6 Flash's 1,048,576 tokens. Gemini 3.6 Flash can generate longer responses up to 65,536 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.

Google
Gemini 3.6 Flash
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok-4.20 Beta Reasoning
Input2,000,000 tokens
Output30,000 tokens
Wed Jul 29 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3.6 Flash and Grok-4.20 Beta Reasoning support multimodal inputs.

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

Gemini 3.6 Flash

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 3.6 Flash

Proprietary

Closed source

Grok-4.20 Beta Reasoning

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.6 Flash was released on 2026-07-21, while Grok-4.20 Beta Reasoning was released on 2026-03-09.

Gemini 3.6 Flash is 4 months newer than Grok-4.20 Beta Reasoning.

Gemini 3.6 Flash

Jul 21, 2026

1 weeks ago

4mo newer
Grok-4.20 Beta Reasoning

Mar 9, 2026

4 months ago

Knowledge Cutoff

When training data ends

Gemini 3.6 Flash has a documented knowledge cutoff of 2026-03-31, while Grok-4.20 Beta Reasoning's cutoff date is not specified.

We can confirm Gemini 3.6 Flash's training data extends to 2026-03-31, but cannot make a direct comparison without Grok-4.20 Beta Reasoning's cutoff date.

Gemini 3.6 Flash

Mar 2026

Grok-4.20 Beta Reasoning

—

Provider Availability

Gemini 3.6 Flash is available from Google. Grok-4.20 Beta Reasoning is available from xAI.

Gemini 3.6 Flash

google logo
Google
Input Price:Input: $1.50/1MOutput Price:Output: $7.50/1M

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 3.6 Flash and Grok-4.20 Beta Reasoning side-by-side, then vote on the output you prefer.

Gemini 3.6 Flash
✓ Preferred
Grok-4.20 Beta Reasoning
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 3.6 Flash
xAI
Grok-4.20 Beta Reasoning

FAQ

Common questions about Gemini 3.6 Flash vs Grok-4.20 Beta Reasoning.

Which is better, Gemini 3.6 Flash or Grok-4.20 Beta Reasoning?

Gemini 3.6 Flash (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 3.6 Flash compare to Grok-4.20 Beta Reasoning in benchmarks?

Gemini 3.6 Flash scores CharXiv-R: 89.4%, OSWorld-Verified: 83.0%, Terminal-Bench 2.1: 78.0%, MLE-Bench: 63.9%, SWE-Bench Pro: 58.7%. Grok-4.20 Beta Reasoning scores Finance Agent v2: 28.5%.

Is Gemini 3.6 Flash cheaper than Grok-4.20 Beta Reasoning?

Gemini 3.6 Flash is 1.3x cheaper for input tokens. Gemini 3.6 Flash costs $1.50/M input and $7.50/M output via google. Grok-4.20 Beta Reasoning costs $2.00/M input and $6.00/M output via xai.

What are the context window sizes for Gemini 3.6 Flash and Grok-4.20 Beta Reasoning?

Gemini 3.6 Flash 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 3.6 Flash and Grok-4.20 Beta Reasoning?

Key differences include context window (1.0M vs 2.0M), input pricing ($1.50 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.6 Flash and Grok-4.20 Beta Reasoning?

Gemini 3.6 Flash is developed by Google and Grok-4.20 Beta Reasoning is developed by xAI.

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