Gemini 3.1 Pro vs Grok 4.6: pricing and benchmarks
Both charge $2.00 per 1M input tokens. Grok 4.6 is 50% cheaper on output tokens ($6.00 vs $12.00 per 1M). On our document Q&A workload (50,000 questions a month), Grok 4.6 costs $980.00 a month versus $1,160 for Gemini 3.1 Pro, 16% less. Roughly tied. Gemini 3.1 Pro scores 155.0 and Grok 4.6 scores 156.3 on the Epoch Capabilities Index, and their confidence intervals overlap.
Prices verified September 14, 2026.
Which should you choose?
Roughly tied. Gemini 3.1 Pro scores 155.0 and Grok 4.6 scores 156.3 on the Epoch Capabilities Index, and their confidence intervals overlap.
Grok 4.6 scores 67.5% on DeepSWE vs 11.7% for Gemini 3.1 Pro.
Grok 4.6 scores 66.0% on FrontierMath (Tiers 1–3) vs 59.6% for Gemini 3.1 Pro.
Grok 4.6 costs $3.00 per 1M tokens (3:1 input-to-output mix) vs $4.50 for Gemini 3.1 Pro, 33% less.
Grok 4.6 delivers equal or higher overall capability for 33% less.
Pricing and specs
| Gemini 3.1 Pro | Grok 4.6 | |
|---|---|---|
| Provider | xAI | |
| API model ID | gemini-3.1-pro-preview | grok-4.6 |
| Input / 1M tokens | $2.00 | $2.00 |
| Cached input / 1M tokens | $0.20 | $0.50 |
| Output / 1M tokens | $12.00 | $6.00 |
| Long-context rates | $4.00 in / $18.00 out above 200K prompt tokens | $4.00 in / $12.00 out above 200K prompt tokens |
| Context window | 1.05M tokens | 500K tokens |
| Max output | 66K tokens | — |
| Batch discount | — | — |
Benchmarks
| Gemini 3.1 Pro | Grok 4.6 | |
|---|---|---|
| Epoch Capabilities Index | 155.0 | 156.3 |
| GPQA Diamond· Science reasoning | 92.6% | 92.0% |
| FrontierMath (Tiers 1–3)· Advanced math | 59.6% | 66.0% |
| SimpleQA Verified· Factual accuracy | 73.5% | 49.3% |
| ARC-AGI-2· Abstract reasoning | 77.1% | 67.1% |
| DeepSWE· Coding | 11.7% | 67.5% |
| APEX-Agents· Agentic work | 33.5% | 41.2% |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | Gemini 3.1 Pro | Grok 4.6 | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $780.00 | $540.00 | Grok 4.6 31% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $1,160 | $980.00 | Grok 4.6 16% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $536.00 | $500.00 | Grok 4.6 7% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Gemini 3.1 Pro vs Grok 4.6 cost calculator
- $980.00/mo$0.02 / request
- Gemini 3.1 ProGoogle$1,160/mo$0.02 / request
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Gemini 3.1 Pro pricing notes
Google’s Gemini 3.1 Pro model, currently offered as a preview.
- Prompts over 200K tokens are billed at $4 input / $18 output per 1M tokens.
- No free tier on the Gemini API.
- Output price includes thinking tokens.
Grok 4.6 pricing notes
xAI’s flagship model for code and everything else, with agentic tool calling and configurable reasoning.
- Requests with 200K or more prompt tokens are billed at $4 input / $1 cached / $12 output for all tokens.
- Web Search and X Search tools cost $5 per 1,000 calls.
Frequently asked questions
- Is Gemini 3.1 Pro cheaper than Grok 4.6?
- Both charge $2.00 per 1M input tokens. Grok 4.6 is 50% cheaper on output tokens ($6.00 vs $12.00 per 1M). On our document Q&A workload (50,000 questions a month), Grok 4.6 costs $980.00 a month versus $1,160 for Gemini 3.1 Pro, 16% less.
- Which is more capable, Gemini 3.1 Pro or Grok 4.6?
- Roughly tied. Gemini 3.1 Pro scores 155.0 and Grok 4.6 scores 156.3 on the Epoch Capabilities Index, and their confidence intervals overlap.
- How much does Gemini 3.1 Pro cost per 1M tokens?
- Gemini 3.1 Pro costs $2.00 per 1M input tokens and $12.00 per 1M output tokens, and $0.20 per 1M cached input tokens on Google’s standard tier.
- How much does Grok 4.6 cost per 1M tokens?
- Grok 4.6 costs $2.00 per 1M input tokens and $6.00 per 1M output tokens, and $0.50 per 1M cached input tokens on xAI’s standard tier.
- Which has the larger context window, Gemini 3.1 Pro or Grok 4.6?
- Gemini 3.1 Pro has the larger context window: 1.05M tokens versus 500K for Grok 4.6.