Gemini 2.5 Pro vs Grok-4.20 Beta Reasoning Comparison
Comparing Gemini 2.5 Pro and Grok-4.20 Beta Reasoning across benchmarks, pricing, and capabilities.
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 2.5 Pro and Grok-4.20 Beta Reasoning don'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 2.5 Pro ($1.25/1M tokens) is 1.6x cheaper than Grok-4.20 Beta Reasoning ($2.00/1M tokens).
For output processing, Gemini 2.5 Pro ($10.00/1M tokens) is 1.7x more expensive than Grok-4.20 Beta Reasoning ($6.00/1M tokens).
In conclusion, Gemini 2.5 Pro is more expensive than Grok-4.20 Beta Reasoning.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4.20 Beta Reasoning accepts 2,000,000 input tokens compared to Gemini 2.5 Pro's 1,048,576 tokens. Gemini 2.5 Pro can generate longer responses up to 65,536 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 2.5 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 2.5 Pro
Grok-4.20 Beta Reasoning
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 2.5 Pro was released on 2025-05-20, while Grok-4.20 Beta Reasoning was released on 2026-03-09.
Grok-4.20 Beta Reasoning is 10 months newer than Gemini 2.5 Pro.
May 20, 2025
9 months ago
Mar 9, 2026
5 days ago
9mo newerKnowledge Cutoff
When training data ends
Gemini 2.5 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 2.5 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Grok-4.20 Beta Reasoning's cutoff date.
Jan 2025
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Provider Availability
Gemini 2.5 Pro is available from Google. Grok-4.20 Beta Reasoning is available from xAI. The availability of providers can affect quality of the model and reliability.
Gemini 2.5 Pro
Grok-4.20 Beta Reasoning
Outputs Comparison
Key Takeaways
Gemini 2.5 ProGrok-4.20 Beta ReasoningDetailed Comparison
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