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Grok 4 vs Gemini 3.1 Pro
A detailed comparison of Grok 4 (xAI) and Gemini 3.1 Pro (Google) across pricing, performance, and features.
Pricing Comparison
| Metric | Grok 4 | Gemini 3.1 Pro | Difference |
|---|---|---|---|
| Input / 1M tokens | $3.00 | $2.00 | -33% |
| Output / 1M tokens | $15.00 | $12.00 | -20% |
| Context window | 128K | 1M | — |
| Max output | 16.384K | 64K | — |
Benchmark Comparison
| Benchmark | Grok 4 | Gemini 3.1 Pro |
|---|---|---|
| MMLU-Pro | 86% | 91% |
| HumanEval | 93% | 95% |
| GPQA | 72% | 94.3% |
Capabilities
| Capability | Grok 4 | Gemini 3.1 Pro |
|---|---|---|
| audio | ✗ | ✓ |
| code | ✓ | ✓ |
| reasoning | ✓ | ✓ |
| text | ✓ | ✓ |
| tool-use | ✓ | ✓ |
| vision | ✓ | ✓ |
| web-search | ✓ | ✗ |
Grok 4 Strengths
- ✓Built-in web search and real-time data
- ✓Strong reasoning
- ✓$25 free credits for new users
Grok 4 Weaknesses
- ✗Premium pricing for its benchmark tier
- ✗Additional charges for tool invocations ($2.50-$5/1K calls)
- ✗Smaller ecosystem than OpenAI/Anthropic
Gemini 3.1 Pro Strengths
- ✓#1 on 12 of 18 tracked benchmarks
- ✓94.3% GPQA Diamond — highest of any model
- ✓Same price as Gemini 3 Pro (free upgrade)
- ✓1M context with configurable thinking levels
Gemini 3.1 Pro Weaknesses
- ✗Still in preview
- ✗Context-tiered pricing ($4/$18 above 200K)
Quick Verdict
Best value: Gemini 3.1 Pro is the more affordable option at $2/$12 per 1M tokens.
Higher benchmarks: Gemini 3.1 Pro scores higher on average across available benchmarks (93.4% avg).
Larger context: Gemini 3.1 Pro supports 1M tokens.
Choose Gemini 3.1 Pro if cost matters most. Choose Grok 4 if you need the best possible quality for complex tasks.