Gemini 3.1 Pro Preview vs Kimi K2.6
Gemini 3.1 Pro Preview (2026) and Kimi K2.6 (2026) are agentic coding models from Google DeepMind and Moonshot AI. Gemini 3.1 Pro Preview ships a 1M-token context window, while Kimi K2.6 ships a 262K-token context window. On SWE-bench Verified, Gemini 3.1 Pro Preview leads by a hair. On pricing, Kimi K2.6 costs $0.75/1M input tokens versus $2/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Kimi K2.6 is ~167% cheaper at $0.75/1M; pay for Gemini 3.1 Pro Preview only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Gemini 3.1 Pro Preview | Kimi K2.6 |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 262K |
| Cheapest output | $12/1M tokens | $3.5/1M tokens |
| Provider routes | 4 tracked | 4 tracked |
| Shared benchmarks | SWE-bench Verified leader | 4 rows |
Decision tradeoffs
- Gemini 3.1 Pro Preview leads the largest shared benchmark signal on SWE-bench Verified by 0.4 points.
- Gemini 3.1 Pro Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 3.1 Pro Preview uniquely exposes Structured outputs and Code execution in local model data.
- Local decision data tags Gemini 3.1 Pro Preview for Coding, RAG, and Agents.
- Kimi K2.6 leads the largest shared benchmark signal on SWE-bench Pro by 4.4 points.
- Kimi K2.6 has the lower cheapest tracked output price at $3.5/1M tokens.
- Kimi K2.6 uniquely exposes Reasoning in local model data.
- Local decision data tags Kimi K2.6 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Gemini 3.1 Pro Preview
$4,600
Cheapest tracked route: Google AI Studio
Kimi K2.6
$1,475
Cheapest tracked route: OpenRouter
Estimated monthly gap: $3,125. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Kimi K2.6 is $8.5/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Structured outputs and Code execution before moving production traffic.
- Kimi K2.6 adds Reasoning in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 3.1 Pro Preview is $8.5/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Reasoning before moving production traffic.
- Gemini 3.1 Pro Preview adds Structured outputs and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-19 | 2026-04-20 |
| Context window | 1M | 262K |
| Parameters | — | 1T |
| Architecture | decoder only | Mixture of Experts (MoE) |
| License | Proprietary | Open Source |
| Knowledge cutoff | 2025-01 | - |
Pricing and availability
| Pricing attribute | Gemini 3.1 Pro Preview | Kimi K2.6 |
|---|---|---|
| Input price | $2/1M tokens | $0.75/1M tokens |
| Output price | $12/1M tokens | $3.5/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 3.1 Pro Preview | Kimi K2.6 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | Yes | No |
Benchmarks
| Benchmark | Gemini 3.1 Pro Preview | Kimi K2.6 |
|---|---|---|
| SWE-bench Verified | 80.6 | 80.2 |
| Google-Proof Q&A | 94.3 | 90.5 |
| Chatbot Arena | 1493.0 | 1454.0 |
| SWE-bench Pro | 54.2 | 58.6 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Gemini 3.1 Pro Preview at 80.6 and Kimi K2.6 at 80.2, with Gemini 3.1 Pro Preview ahead by 0.4 points; Google-Proof Q&A has Gemini 3.1 Pro Preview at 94.3 and Kimi K2.6 at 90.5, with Gemini 3.1 Pro Preview ahead by 3.8 points; Chatbot Arena has Gemini 3.1 Pro Preview at 1493 and Kimi K2.6 at 1454, with Gemini 3.1 Pro Preview ahead by 39 points. The largest visible gap is 39 points on Chatbot Arena, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: Kimi K2.6, structured outputs: Gemini 3.1 Pro Preview, and code execution: Gemini 3.1 Pro Preview. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Gemini 3.1 Pro Preview lists $2/1M input and $12/1M output tokens, while Kimi K2.6 lists $0.75/1M input and $3.5/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Kimi K2.6 lower by about $3.42 per million blended tokens. Availability is 4 providers versus 4, so concentration risk also matters.
Choose Gemini 3.1 Pro Preview when coding workflow support and larger context windows are central to the workload. Choose Kimi K2.6 when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Gemini 3.1 Pro Preview or Kimi K2.6?
Gemini 3.1 Pro Preview supports 1M tokens, while Kimi K2.6 supports 262K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Gemini 3.1 Pro Preview or Kimi K2.6?
Kimi K2.6 is cheaper on tracked token pricing. Gemini 3.1 Pro Preview costs $2/1M input and $12/1M output tokens. Kimi K2.6 costs $0.75/1M input and $3.5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 3.1 Pro Preview or Kimi K2.6 open source?
Gemini 3.1 Pro Preview is listed under Proprietary. Kimi K2.6 is listed under Open Source. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Gemini 3.1 Pro Preview or Kimi K2.6?
Both Gemini 3.1 Pro Preview and Kimi K2.6 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Gemini 3.1 Pro Preview or Kimi K2.6?
Both Gemini 3.1 Pro Preview and Kimi K2.6 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Gemini 3.1 Pro Preview and Kimi K2.6?
Gemini 3.1 Pro Preview is available on Google AI Studio, GCP Vertex AI, OpenRouter, and Replicate API. Kimi K2.6 is available on NVIDIA NIM, Moonshot AI Kimi, Fireworks AI, and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.