Grok 4.3 vs Gemini 3.1 Pro
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by xAI
|
by Google
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Current flagship |
| Released | Apr 30, 2026 | Feb 19, 2026 |
| Pricing per million tokens | ||
| Input | $1.25/Mtok | $2.00/Mtok |
| Output | $2.50/Mtok | $12.00/Mtok |
| Blended avg | $1.56/Mtok | $4.50/Mtok |
| Cached input | — | $0.200/Mtok |
| Specifications | ||
| Context window | 1M tokens | 2M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimageaudiovideo
|
| Benchmarks sources: xAI model card, Artificial Analysis / Vellum LLM Leaderboard | ||
| Avg benchmark score | 72.4 | 74.8 |
| Perf / dollar | 46.3 | 16.6 |
| GPQA Diamond | 80 | 94.3 |
| Humanity's Last Exam | 38 | 44.4 |
| ARC-AGI 2 | 42 | 77.1 |
| HumanEval | 90 | 80.6 |
| SWE-Bench Verified | 65 | — |
| Terminal-Bench 2.1 | — | 70.3 |
| MCP Atlas | — | 69.2 |
| BrowseComp | — | 85.9 |
| OSWorld-Verified | — | 76.2 |
| AIME 2025 | 85 | — |
| MMMLU | 86 | — |
| BFCL | 78 | — |
| MATH 500 | 88 | — |
| Independent composite scores each on its own scale — not part of the average above | ||
| AA Intelligence Index | 37.9 | 47.7 |
| AA Agentic Index | 24.2 | 23 |
| AA-Omniscience Index (−100–100) | 18 | 31.9 |
| LMSYS Chatbot Arena | 1442.1 ELO | 1486.3 ELO |
| Providers | ||
| Available from |
xAI — $1.25/$2.50/Mtok
|
Google — $2.00/$12.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Grok 4.3 | Gemini 3.1 Pro | Savings |
|---|---|---|---|
| 1M tokens | $1.56 | $4.5 | $2.94 (65.3%) |
| 10M tokens | $15.63 | $45 | $29.38 (65.3%) |
| 100M tokens | $156.25 | $450 | $293.75 (65.3%) |
| 1000M tokens | $1562.5 | $4500 | $2937.5 (65.3%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $1.56/Mtok blended vs $4.50 — 65.3% 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 4.3 doesn't offer
- you need the longer context: 2M tokens vs 1M (2×)
- raw capability matters more than price: 74.8 vs 72.4 average benchmark score
The cheaper option here — Grok 4.3 costs $1.56/Mtok blended on xAI.
Summary
Grok 4.3 by xAI costs $1.25/Mtok input and $2.50/Mtok output, with a 1M-token context window. It supports text, image input.
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.
On a blended cost basis, Grok 4.3 is 65.3% cheaper than Gemini 3.1 Pro.
On benchmarks, Gemini 3.1 Pro scores higher (74.8 vs 72.4) on average. In terms of value, Grok 4.3 has better performance per dollar (46.3 vs 16.6).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.