Gemini 3.1 Pro vs Grok Code Fast 1
Compare Google and xAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Gemini 3.1 Pro
Grok Code Fast 1
Cost Differences
Grok Code Fast 1 costs less than Gemini 3.1 Pro
Feature Comparison
| Feature | Gemini 3.1 Pro | Grok Code Fast 1 |
|---|---|---|
| Provider | xAI | |
| Input Price | $2.00/1M tokens | $0.20/1M tokens |
| Output Price | $12.00/1M tokens | $1.50/1M tokens |
| Context Window | 1,000,000 tokens | 256,000 tokens |
| Max Output | 65,536 tokens | 32,768 tokens |
| Category | flagship | standard |
| Capabilities | textvisionaudiovideocodereasoning | textcodereasoning |
| Release Date | 2/19/2026 | 2/1/2026 |
Gemini 3.1 Pro vs Grok Code Fast 1: Which Should You Choose?
Choosing between Gemini 3.1 Pro and Grok Code Fast 1 depends on your priorities: cost efficiency, context length, or raw capability. Grok Code Fast 1 is the more affordable option at $0.20/1M input tokens — 90% cheaper than Gemini 3.1 Pro. Meanwhile, Gemini 3.1 Pro offers a significantly larger context window at 1,000,000 tokens vs 256,000 for Grok Code Fast 1.
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 Code Fast 1 is standard. This means they're optimized for different workloads. Gemini 3.1 Pro is built for complex tasks that require deeper reasoning, while Grok Code Fast 1 offers better value for routine operations.
Output costs matter too. Gemini 3.1 Pro charges $12.00/1M output tokens vs $1.50 for Grok Code Fast 1. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok Code Fast 1 has the edge here at $1.50/1M output tokens.
Multimodal capabilities: Gemini 3.1 Pro supports vision (image inputs) while Grok Code Fast 1 is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose Gemini 3.1 Pro when:
- • You need a larger context window (1,000,000 tokens)
- • You need more capabilities (vision, audio, video)
- • You need longer outputs (up to 65,536 tokens)
- • You're already using Google's API ecosystem
Choose Grok Code Fast 1 when:
- • Budget is a primary concern
- • 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 Code Fast 1 (xAI)
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