Kimi K3 vs Gemini 3.1 Pro
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
|
Mby Moonshot
|
Gby Google
|
|
|---|---|---|
| Overview | ||
| Status | Current flagship Open weights | Current flagship |
| Released | Jul 16, 2026 | Nov 1, 2025 |
| Pricing per million tokens | ||
| Input | $3.00/Mtok | $2.00/Mtok |
| Output | $15.00/Mtok | $12.00/Mtok |
| Blended avg | $9.00/Mtok | $7.00/Mtok |
| Cached input | $0.300/Mtok | $0.200/Mtok |
| Specifications | ||
| Context window | 1M tokens | 2M tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimageaudiovideo
|
| Benchmarks sources: Artificial Analysis, LMSYS Chatbot Arena (UC Berkeley), Moonshot launch benchmarks / Vellum LLM Leaderboard | ||
| Avg benchmark score | 80 | |
| Perf / dollar | 11.4 | |
| GPQA Diamond | 93.5 | 94.3 |
| SWE-Bench | — | 75 |
| HumanEval | — | 93 |
| MATH 500 | — | 95 |
| Providers | ||
| Available from |
Moonshot — $3.00/$15.00/Mtok
|
Google — $2.00/$12.00/Mtok
|
Cost at scale — 1M tokens (50/50 input/output)
| Volume | Kimi K3 | Gemini 3.1 Pro | Savings |
|---|---|---|---|
| 1M tokens | $9 | $7 | $2 (22.2%) |
| 10M tokens | $90 | $70 | $20 (22.2%) |
| 100M tokens | $900 | $700 | $200 (22.2%) |
| 1000M tokens | $9000 | $7000 | $2000 (22.2%) |
Summary
Kimi K3 by Moonshot costs $3.00/Mtok input and $15.00/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, Gemini 3.1 Pro is 22.2% cheaper than Kimi K3. It also has a larger context window.
On benchmarks, Gemini 3.1 Pro scores higher (80 vs ) on average. In terms of value, Gemini 3.1 Pro has better performance per dollar (11.4 vs ).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.