Gemini 3 Flash Preview vs Grok 4.3
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by Google
|
by xAI
|
|---|---|---|
| Overview | ||
| Status | Preview flagship | Current flagship |
| Released | Dec 17, 2025 | Apr 30, 2026 |
| Pricing per million tokens | ||
| Input | $0.500/Mtok | $1.25/Mtok |
| Output | $3.00/Mtok | $2.50/Mtok |
| Blended avg | $1.13/Mtok | $1.56/Mtok |
| Cached input | $0.050/Mtok | $0.200/Mtok |
| Specifications | ||
| Context window | 1M tokens | 1M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimageaudiovideo
|
textimage
|
| Benchmarks sources: Artificial Analysis, Google model card, Google model card (no tools) / xAI model card, Artificial Analysis | ||
| GPQA Diamond | 90.4 vendor | 80 |
| SWE-Bench Verified | 78 vendor | 65 |
| Humanity's Last Exam | 33.7 vendor | 38 |
| Avg benchmark score | — | 72.4 |
| Perf / dollar | — | 46.3 |
| ARC-AGI 2 | — | 42 |
| AIME 2025 | — | 85 |
| MMMLU | — | 86 |
| BFCL | — | 78 |
| HumanEval | — | 90 |
| MATH 500 | — | 88 |
| Independent composite scores each on its own scale — not part of the average above | ||
| AA Intelligence Index | 27 | 37.9 |
| LMSYS Chatbot Arena | 1472.8 ELO | 1441.6 ELO |
| AA Agentic Index | — | 24.2 |
| AA-Omniscience Index (−100–100) | — | 18 |
| Providers | ||
| Available from |
Google — $0.500/$3.00/Mtok
|
xAI — $1.25/$2.50/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Gemini 3 Flash Preview | Grok 4.3 | Savings |
|---|---|---|---|
| 1M tokens | $1.13 | $1.56 | $0.44 (28.2%) |
| 10M tokens | $11.25 | $15.63 | $4.38 (28%) |
| 100M tokens | $112.5 | $156.25 | $43.75 (28%) |
| 1000M tokens | $1125 | $1562.5 | $437.5 (28%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $1.13/Mtok blended vs $1.56 — 28% less on the same 50/50 token mix
- your workload re-reads context (agents, RAG, long chats): cached input costs $0.050/Mtok — 90% off its list input price
- this pairing gives Grok 4.3 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 Flash Preview costs $1.13/Mtok blended on Google.
Summary
Gemini 3 Flash Preview by Google costs $0.500/Mtok input and $3.00/Mtok output, with a 1M-token context window. It supports text, image, audio, video input.
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.
On a blended cost basis, Gemini 3 Flash Preview is 28% cheaper than Grok 4.3.It also has a larger context window.
The two aren't directly comparable on average benchmark score: Grok 4.3 has published per-benchmark results, while Gemini 3 Flash Preview does not yet — it is measured today on independent composites (see the table above).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.