Gemma 3 4B vs Grok-4 Fast Reasoning
Comparing Gemma 3 4B and Grok-4 Fast Reasoning across benchmarks, pricing, and capabilities.
Google · xAI · Updated for 2026
Which is better?
Gemma 3 4B and Grok-4 Fast Reasoning trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, Gemma 3 4B is roughly 11.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4 Fast 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 Gemma 3 4B
- cost matters — it's about 11.0x cheaper per token
- you need open weights you can self-host or fine-tune
Choose Grok-4 Fast Reasoning
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Aug 2025
At a glance
The differences that matter most.
Individual benchmarks
26 reported for Gemma 3 4B · 0 for Grok-4 Fast Reasoning
Gemma 3 4B and Grok-4 Fast Reasoningdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemma 3 4B ($0.02/1M tokens) is 10.0x cheaper than Grok-4 Fast Reasoning ($0.20/1M tokens).
For output processing, Gemma 3 4B ($0.04/1M tokens) is 12.5x cheaper than Grok-4 Fast Reasoning ($0.50/1M tokens).
In conclusion, Grok-4 Fast Reasoning is more expensive than Gemma 3 4B.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok-4 Fast Reasoning accepts 2,000,000 input tokens compared to Gemma 3 4B's 131,072 tokens. Gemma 3 4B can generate longer responses up to 131,072 tokens, while Grok-4 Fast Reasoning is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemma 3 4B and Grok-4 Fast Reasoning support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemma 3 4B
Grok-4 Fast Reasoning
License
Usage and distribution terms
Gemma 3 4B is licensed under Gemma, while Grok-4 Fast Reasoning uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Gemma
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Gemma 3 4B was released on 2025-03-12, while Grok-4 Fast Reasoning was released on 2025-08-28.
Grok-4 Fast Reasoning is 6 months newer than Gemma 3 4B.
Mar 12, 2025
1.5 years ago
Aug 28, 2025
1.0 years ago
5mo newerKnowledge Cutoff
When training data ends
Gemma 3 4B has a documented knowledge cutoff of 2024-08-01, while Grok-4 Fast Reasoning's cutoff date is not specified.
We can confirm Gemma 3 4B's training data extends to 2024-08-01, but cannot make a direct comparison without Grok-4 Fast Reasoning's cutoff date.
Aug 2024
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Provider Availability
Gemma 3 4B is available from DeepInfra. Grok-4 Fast Reasoning is available from xAI.
Gemma 3 4B
Grok-4 Fast Reasoning
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemma 3 4B and Grok-4 Fast Reasoning side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemma 3 4B vs Grok-4 Fast Reasoning.