Gemini 3.1 Pro Preview Custom Tools vs Gemini Deep Research
Gemini 3.1 Pro Preview Custom Tools (2026) and Gemini Deep Research (2024) are compact production models from Google DeepMind. Gemini 3.1 Pro Preview Custom Tools ships a 1M-token context window, while Gemini Deep Research ships a 128K-token context window. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Gemini 3.1 Pro Preview Custom Tools fits 8x more tokens; pick it for long-context work and Gemini Deep Research for tighter calls.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-01-01 | 2024-12-11 |
| Context window | 1M | 128K |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Unknown | Proprietary |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Gemini 3.1 Pro Preview Custom Tools | Gemini Deep Research |
|---|---|---|
| Input price | $2/1M tokens | - |
| Output price | $12/1M tokens | - |
| Providers |
Capabilities
| Capability | Gemini 3.1 Pro Preview Custom Tools | Gemini Deep Research |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | No |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on function calling: Gemini Deep Research and tool use: Gemini Deep Research. Both models share 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.
Pricing coverage is uneven: Gemini 3.1 Pro Preview Custom Tools has $2/1M input tokens and Gemini Deep Research has no token price sourced yet. Provider availability is 1 tracked routes versus 1. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Gemini 3.1 Pro Preview Custom Tools when long-context analysis and larger context windows are central to the workload. Choose Gemini Deep Research when provider fit are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which has a larger context window, Gemini 3.1 Pro Preview Custom Tools or Gemini Deep Research?
Gemini 3.1 Pro Preview Custom Tools supports 1M tokens, while Gemini Deep Research supports 128K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Gemini 3.1 Pro Preview Custom Tools or Gemini Deep Research open source?
Gemini 3.1 Pro Preview Custom Tools is listed under Unknown. Gemini Deep Research is listed under Proprietary. 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 function calling, Gemini 3.1 Pro Preview Custom Tools or Gemini Deep Research?
Gemini Deep Research has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for tool use, Gemini 3.1 Pro Preview Custom Tools or Gemini Deep Research?
Gemini Deep Research has the clearer documented tool use signal in this comparison. If tool use is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for structured outputs, Gemini 3.1 Pro Preview Custom Tools or Gemini Deep Research?
Both Gemini 3.1 Pro Preview Custom Tools and Gemini Deep Research expose structured outputs. 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 Custom Tools and Gemini Deep Research?
Gemini 3.1 Pro Preview Custom Tools is available on OpenRouter. Gemini Deep Research is available on Google AI Studio. 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.