Gemini 3.1 Flash-Lite Preview vs Grok 4.20
Compare Google and xAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Gemini 3.1 Flash-Lite Preview
Grok 4.20
Cost Differences
Grok 4.20 costs more than Gemini 3.1 Flash-Lite Preview
Feature Comparison
| Feature | Gemini 3.1 Flash-Lite Preview | Grok 4.20 |
|---|---|---|
| Provider | xAI | |
| Input Price | $0.25/1M tokens | $2.00/1M tokens |
| Output Price | $1.50/1M tokens | $6.00/1M tokens |
| Context Window | 1,000,000 tokens | 2,000,000 tokens |
| Max Output | 8,192 tokens | 131,072 tokens |
| Category | efficient | reasoning |
| Capabilities | textvisioncode | textvisionreasoningcode |
| Release Date | 3/3/2026 | 2/17/2026 |
Gemini 3.1 Flash-Lite Preview vs Grok 4.20: Which Should You Choose?
Choosing between Gemini 3.1 Flash-Lite Preview and Grok 4.20 depends on your priorities: cost efficiency, context length, or raw capability. Gemini 3.1 Flash-Lite Preview is the more affordable option at $0.25/1M input tokens — 88% cheaper than Grok 4.20. Meanwhile, Grok 4.20 offers a significantly larger context window at 2,000,000 tokens vs 1,000,000 for Gemini 3.1 Flash-Lite Preview.
These models come from different providers — Google and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Google, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Gemini 3.1 Flash-Lite Preview is a efficient model while Grok 4.20 is reasoning. This means they're optimized for different workloads. Grok 4.20 targets more demanding workloads, while Gemini 3.1 Flash-Lite Preview provides a cost-effective option for everyday tasks.
Output costs matter too. Gemini 3.1 Flash-Lite Preview charges $1.50/1M output tokens vs $6.00 for Grok 4.20. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Gemini 3.1 Flash-Lite Preview has the edge here at $1.50/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Gemini 3.1 Flash-Lite Preview when:
- • Budget is a primary concern
- • You're already using Google's API ecosystem
- • You're running high-volume, latency-sensitive workloads
Choose Grok 4.20 when:
- • You need a larger context window (2,000,000 tokens)
- • You need more capabilities (reasoning)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using xAI's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Gemini 3.1 Flash-Lite Preview (Google)
Grok 4.20 (xAI)
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