Gemini 3.1 Pro vs Grok 4.20
Compare Google and xAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Gemini 3.1 Pro
Grok 4.20
Cost Differences
Grok 4.20 costs less than Gemini 3.1 Pro
Feature Comparison
| Feature | Gemini 3.1 Pro | Grok 4.20 |
|---|---|---|
| Provider | xAI | |
| Input Price | $2.00/1M tokens | $2.00/1M tokens |
| Output Price | $12.00/1M tokens | $6.00/1M tokens |
| Context Window | 1,000,000 tokens | 2,000,000 tokens |
| Max Output | 65,536 tokens | 131,072 tokens |
| Category | flagship | reasoning |
| Capabilities | textvisionaudiovideocodereasoning | textvisionreasoningcode |
| Release Date | 2/19/2026 | 2/17/2026 |
Gemini 3.1 Pro vs Grok 4.20: Which Should You Choose?
Choosing between Gemini 3.1 Pro and Grok 4.20 depends on your priorities: cost efficiency, context length, or raw capability. Grok 4.20 is the more affordable option at $2.00/1M input tokens. Meanwhile, Grok 4.20 offers a significantly larger context window at 2,000,000 tokens vs 1,000,000 for Gemini 3.1 Pro.
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 Pro is a flagship model while Grok 4.20 is reasoning. This means they're optimized for different workloads. Gemini 3.1 Pro is built for complex tasks that require deeper reasoning, while Grok 4.20 offers better value for routine operations.
Output costs matter too. Gemini 3.1 Pro charges $12.00/1M output tokens vs $6.00 for Grok 4.20. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 4.20 has the edge here at $6.00/1M 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 Pro when:
- • You need more capabilities (audio, video)
- • You're already using Google's API ecosystem
Choose Grok 4.20 when:
- • You need a larger context window (2,000,000 tokens)
- • 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 Pro (Google)
Grok 4.20 (xAI)
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