Gemini 3.1 Flash-Lite vs Grok-4.20 Beta Reasoning
Gemini 3.1 Flash-Lite and Grok-4.20 Beta Reasoning are closely matched at 30.5 and 23.4 on the LLM Stats Score. Gemini 3.1 Flash-Lite is 5.3x cheaper per token.
Google · xAI · Updated for 2026
Which is better?
Gemini 3.1 Flash-Lite and Grok-4.20 Beta Reasoning are closely matched on the overall LLM Stats Score at 30.5 and 23.4.
In the 1 individual benchmarks reported for both models, Gemini 3.1 Flash-Lite wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Gemini 3.1 Flash-Lite is roughly 5.3x 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.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Gemini 3.1 Flash-Lite
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 5.3x cheaper per token
Choose Grok-4.20 Beta Reasoning
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Mar 2026
At a glance
The differences that matter most.
Individual benchmarks
11 reported for Gemini 3.1 Flash-Lite · 1 for Grok-4.20 Beta Reasoning
Gemini 3.1 Flash-Lite outperforms in 1 benchmarks (Finance Agent v2), while Grok-4.20 Beta Reasoning is better at 0 benchmarks.
Gemini 3.1 Flash-Lite significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 3.1 Flash-Lite ($0.25/1M tokens) is 8.0x cheaper than Grok-4.20 Beta Reasoning ($2.00/1M tokens).
For output processing, Gemini 3.1 Flash-Lite ($1.50/1M tokens) is 4.0x cheaper than Grok-4.20 Beta Reasoning ($6.00/1M tokens).
In conclusion, Grok-4.20 Beta Reasoning is more expensive than Gemini 3.1 Flash-Lite.*
* 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 3.1 Flash-Lite's 1,000,000 tokens. Gemini 3.1 Flash-Lite can generate longer responses up to 1,000,000 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemini 3.1 Flash-Lite and Grok-4.20 Beta Reasoning support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 3.1 Flash-Lite
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 3.1 Flash-Lite was released on 2026-03-03, while Grok-4.20 Beta Reasoning was released on 2026-03-09.
Grok-4.20 Beta Reasoning is 0 month newer than Gemini 3.1 Flash-Lite.
Mar 3, 2026
7 months ago
Mar 9, 2026
7 months ago
6d newerKnowledge Cutoff
When training data ends
Gemini 3.1 Flash-Lite 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 3.1 Flash-Lite'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 3.1 Flash-Lite is available from DeepInfra, Google. Grok-4.20 Beta Reasoning is available from xAI.
Gemini 3.1 Flash-Lite
Grok-4.20 Beta Reasoning
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 3.1 Flash-Lite and Grok-4.20 Beta Reasoning side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 3.1 Flash-Lite vs Grok-4.20 Beta Reasoning.