Gemini 3.1 Pro vs Grok 4
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by Google
|
by xAI
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Retired flagship |
| Released | Feb 19, 2026 | Jul 9, 2025 |
| Pricing per million tokens | ||
| Input | $2.00/Mtok | $3.00/Mtok |
| Output | $12.00/Mtok | $15.00/Mtok |
| Blended avg | $4.50/Mtok | $6.00/Mtok |
| Cached input | $0.200/Mtok | — |
| Specifications | ||
| Context window | 2M tokens | 256K tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimageaudiovideo
|
textimage
|
| Benchmarks source: Vellum LLM Leaderboard | ||
| Avg benchmark score | 74.8 | 63 |
| Perf / dollar | 16.6 | 10.5 |
| GPQA Diamond | 94.3 | 87.5 |
| Terminal-Bench 2.1 | 70.3 | 27.2 |
| Humanity's Last Exam | 44.4 | 25.4 |
| ARC-AGI 2 | 77.1 | 16 |
| HumanEval | 80.6 | 75 |
| SWE-Bench Verified | — | 55 |
| LiveCodeBench | — | 79 |
| MCP Atlas | 69.2 | — |
| BrowseComp | 85.9 | — |
| OSWorld-Verified | 76.2 | — |
| AIME 2025 | — | 91.7 |
| MMMLU | — | 82 |
| BFCL | — | 72 |
| MATH 500 | — | 82 |
| Independent composite scores each on its own scale — not part of the average above | ||
| LMSYS Chatbot Arena | 1486.5 ELO | 1409.3 ELO |
| AA Intelligence Index | 47.7 | — |
| AA Agentic Index | 23 | — |
| AA-Omniscience Index (−100–100) | 31.9 | — |
| Providers | ||
| Available from |
Google — $2.00/$12.00/Mtok
|
xAI — $3.00/$15.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Gemini 3.1 Pro | Grok 4 | Savings |
|---|---|---|---|
| 1M tokens | $4.5 | $6 | $1.5 (25%) |
| 10M tokens | $45 | $60 | $15 (25%) |
| 100M tokens | $450 | $600 | $150 (25%) |
| 1000M tokens | $4500 | $6000 | $1500 (25%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $4.50/Mtok blended vs $6.00 — 25% less on the same 50/50 token mix
- your workload re-reads context (agents, RAG, long chats): cached input costs $0.200/Mtok — 90% off its list input price, a discount Grok 4 doesn't offer
- you need the longer context: 2M tokens vs 256K (7.8×)
- raw capability matters more than price: 74.8 vs 63 average benchmark score
- this pairing gives Grok 4 no edge on price, context, cache discount, or measured performance — pick it only for qualitative fit (ecosystem, compliance, model behavior on your prompts)
The cheaper option here — Gemini 3.1 Pro costs $4.50/Mtok blended on Google.
Summary
Gemini 3.1 Pro by Google costs $2.00/Mtok input and $12.00/Mtok output, with a 2M-token context window. It supports text, image, audio, video input.
Grok 4 by xAI costs $3.00/Mtok input and $15.00/Mtok output, with a 256K-token context window. It supports text, image input.
On a blended cost basis, Gemini 3.1 Pro is 25% cheaper than Grok 4.It also has a larger context window.
On benchmarks, Gemini 3.1 Pro scores higher (74.8 vs 63) on average. In terms of value, Gemini 3.1 Pro has better performance per dollar (16.6 vs 10.5).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.