Gemini 3.1 Pro vs Kimi K3
Gemini 3.1 Pro and Kimi K3 are both current production-tier models. Gemini 3.1 Pro leads on long-context retrieval, vision.
Specs side by side
| Metric | Google Gemini 3.1 Pro | Z.ai Kimi K3 |
|---|---|---|
| Input price (per 1M) | $2 | $3 |
| Output price (per 1M) | $12 | $15 |
| Context window | 2M tokens | 1.0M tokens |
| Speed tier | balanced | balanced |
| Open weights | No | No |
| EU region | Yes | No |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Gemini 3.1 Pro if…
- You need 2M context (2× more than Kimi K3)
- EU data residency is required
- HIPAA eligibility is required
- Long-context retrieval is central to your workload
- Vision is central to your workload
Choose Kimi K3 if…
- Kimi K3 is in the same tier as Gemini 3.1 Pro — pick by provider preference or API ecosystem
Benchmark delta
Gemini 3.1 Pro leads on
- Long-context retrieval
- Vision
Kimi K3 leads on
Kimi K3 has no meaningful benchmark lead in this pair.
FAQ — Gemini 3.1 Pro vs Kimi K3
Gemini 3.1 Pro vs Kimi K3 — which is better?
Gemini 3.1 Pro and Kimi K3 are both current production-tier models. Gemini 3.1 Pro leads on long-context retrieval, vision. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Gemini 3.1 Pro pricing compare to Kimi K3?
Gemini 3.1 Pro costs $2 / $12 per 1M vs Kimi K3 at $3 / $15 per 1M. Gemini 3.1 Pro is cheaper on output tokens by roughly 25%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Gemini 3.1 Pro or Kimi K3 have the bigger context window?
Gemini 3.1 Pro has a 2M-token context window — 2× the 1.0M context of Kimi K3. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Gemini 3.1 Pro or Kimi K3?
Gemini 3.1 Pro: no — Paid-only since 2026-04-01 (previously had free tier via AI Studio). Kimi K3: no — No free API tier; kimi.com web chat is free with limits.
Which is better for coding — Gemini 3.1 Pro or Kimi K3?
Kimi K3 leads on coding benchmarks (Gemini 3.1 Pro: 94/100, Kimi K3: 95/100). For production coding agents also weigh tool-use performance — Gemini 3.1 Pro scores 91, Kimi K3 scores 90.