xAI: Grok 4.1 Fast vs Google: Gemini 3.1 Flash Lite Preview
Compare these two models side-by-side to help you make the best choice for your needs
xAI: Grok 4.1 Fast
Description
Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)
Strengths
- •Multimodal understanding with text and image support
- •Large context window (2000k tokens)
Best For
Image and document understanding
Google: Gemini 3.1 Flash Lite Preview
Description
Gemini 3.1 Flash Lite Preview is Google's high-efficiency model optimized for high-volume use cases. It outperforms Gemini 2.5 Flash Lite on overall quality and approaches Gemini 2.5 Flash performance across key capabilities. Improvements span audio input/ASR, RAG snippet ranking, translation, data extraction, and code completion. Supports full thinking levels (minimal, low, medium, high) for fine-grained cost/performance trade-offs. Priced at half the cost of Gemini 3 Flash.
Strengths
- •Multimodal understanding with text and image support
- •Large context window (1049k tokens)
Best For
Image and document understanding
| Feature | xAI: Grok 4.1 Fast | Google: Gemini 3.1 Flash Lite Preview |
|---|---|---|
| Provider | OpenRouter | OpenRouter |
| Context Length | 2,000,000 tokens | 1,048,576 tokens |
| Input Price | $0.200/M | $0.250/M |
| Output Price | $0.500/M | $1.50/M |
| Vision Support | Yes | Yes |
| Premium | No | No |
| Capabilities | TextVisionFast | TextVisionFast |