Gemini 3.1 Pro Preview vs Qwen3.5-397B-A17B
Gemini 3.1 Pro Preview (2026) and Qwen3.5-397B-A17B (2026) are frontier reasoning models from Google DeepMind and Alibaba. Gemini 3.1 Pro Preview ships a 1M-token context window, while Qwen3.5-397B-A17B ships a 262K-token context window. On SWE-bench Verified, Gemini 3.1 Pro Preview leads by 4.4 pts. On pricing, Qwen3.5-397B-A17B costs $0.39/1M input tokens versus $2/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Qwen3.5-397B-A17B is ~413% cheaper at $0.39/1M; pay for Gemini 3.1 Pro Preview only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Gemini 3.1 Pro Preview | Qwen3.5-397B-A17B |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 262K |
| Cheapest output | $12/1M tokens | $2.34/1M tokens |
| Provider routes | 4 tracked | 3 tracked |
| Shared benchmarks | SWE-bench Verified leader | 2 rows |
Decision tradeoffs
- Gemini 3.1 Pro Preview leads the largest shared benchmark signal on SWE-bench Verified by 4.4 points.
- Gemini 3.1 Pro Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 3.1 Pro Preview has broader tracked provider coverage for fallback and procurement flexibility.
- Gemini 3.1 Pro Preview uniquely exposes Vision and Code execution in local model data.
- Local decision data tags Gemini 3.1 Pro Preview for Coding, RAG, and Agents.
- Qwen3.5-397B-A17B has the lower cheapest tracked output price at $2.34/1M tokens.
- Qwen3.5-397B-A17B uniquely exposes Reasoning in local model data.
- Local decision data tags Qwen3.5-397B-A17B 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
Qwen3.5-397B-A17B
$897
Cheapest tracked route: OpenRouter
Estimated monthly gap: $3,703. 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.
- Qwen3.5-397B-A17B is $9.66/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision and Code execution before moving production traffic.
- Qwen3.5-397B-A17B adds Reasoning in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 3.1 Pro Preview is $9.66/1M 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 Vision and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-19 | 2026-02-16 |
| Context window | 1M | 262K |
| Parameters | — | 397B |
| Architecture | decoder only | MoE |
| License | Proprietary | Apache 2.0 |
| Knowledge cutoff | 2025-01 | - |
Pricing and availability
| Pricing attribute | Gemini 3.1 Pro Preview | Qwen3.5-397B-A17B |
|---|---|---|
| Input price | $2/1M tokens | $0.39/1M tokens |
| Output price | $12/1M tokens | $2.34/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 3.1 Pro Preview | Qwen3.5-397B-A17B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
Benchmarks
| Benchmark | Gemini 3.1 Pro Preview | Qwen3.5-397B-A17B |
|---|---|---|
| SWE-bench Verified | 80.6 | 76.2 |
| Google-Proof Q&A | 94.3 | 89.3 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Gemini 3.1 Pro Preview at 80.6 and Qwen3.5-397B-A17B at 76.2, with Gemini 3.1 Pro Preview ahead by 4.4 points; Google-Proof Q&A has Gemini 3.1 Pro Preview at 94.3 and Qwen3.5-397B-A17B at 89.3, with Gemini 3.1 Pro Preview ahead by 5 points. The largest visible gap is 5 points on Google-Proof Q&A, 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 vision: Gemini 3.1 Pro Preview, reasoning mode: Qwen3.5-397B-A17B, and code execution: Gemini 3.1 Pro Preview. Both models share multimodal input, function calling, tool use, and structured outputs, 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 Qwen3.5-397B-A17B lists $0.39/1M input and $2.34/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Qwen3.5-397B-A17B lower by about $4.03 per million blended tokens. Availability is 4 providers versus 3, so concentration risk also matters.
Choose Gemini 3.1 Pro Preview when coding workflow support, larger context windows, and broader provider choice are central to the workload. Choose Qwen3.5-397B-A17B when reasoning depth 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 Qwen3.5-397B-A17B?
Gemini 3.1 Pro Preview supports 1M tokens, while Qwen3.5-397B-A17B 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 Qwen3.5-397B-A17B?
Qwen3.5-397B-A17B is cheaper on tracked token pricing. Gemini 3.1 Pro Preview costs $2/1M input and $12/1M output tokens. Qwen3.5-397B-A17B costs $0.39/1M input and $2.34/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 3.1 Pro Preview or Qwen3.5-397B-A17B open source?
Gemini 3.1 Pro Preview is listed under Proprietary. Qwen3.5-397B-A17B is listed under Apache 2.0. 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 Qwen3.5-397B-A17B?
Gemini 3.1 Pro Preview has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Gemini 3.1 Pro Preview or Qwen3.5-397B-A17B?
Both Gemini 3.1 Pro Preview and Qwen3.5-397B-A17B 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 Qwen3.5-397B-A17B?
Gemini 3.1 Pro Preview is available on Google AI Studio, GCP Vertex AI, OpenRouter, and Replicate API. Qwen3.5-397B-A17B is available on OpenRouter, Together AI, and Alibaba Cloud PAI-EAS. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.