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Tool-Orchestration Tier

Gemini 3.1 Pro Preview Custom Tools

A tool-focused pro profile for agent workflows that depend on reliable function and tool selection behavior.

Use Gemini 3.1 Pro Preview Custom Tools in your company

Data checked: 2026-03-15

Context Window
1,048,576
Input / 1M
$2.00
Output / 1M
$12.00

Model Positioning

Gemini 3.1 Pro Preview Custom Tools is positioned to improve tool selection reliability in agentic workflows.

  • Optimized for structured tool-calling behavior.
  • High context and multimodal coverage for complex orchestration.
  • Useful for agent pipelines with strict action semantics.
  • Requires thorough workflow testing before broad production use.

Key Specs

Model ID
google/gemini-3.1-pro-preview-customtools
Context Window
1,048,576 tokens
Modality
text+image+file+audio+video->text
Input Price
$2.00 per 1M tokens
Output Price
$12.00 per 1M tokens
Provider
Google
Listing Date
2026-02-25

Strengths

  • Better fit for tool-heavy agent execution paths.
  • Supports rich input modalities for complex pipelines.
  • Strong option for orchestrated enterprise automation.
  • Helps reduce misfires in tool selection scenarios.

Tradeoffs

  • Preview status can require tighter change management.
  • Higher cost than flash-like throughput tiers.
  • Not necessary for non-agent conversational tasks.
  • Needs robust observability around tool outcomes.

High-Fit Use Cases

  • Agent workflows with deterministic tool execution needs.
  • Multi-step business process automation with tool chains.
  • Enterprise copilots invoking internal APIs safely.
  • Document-plus-tool reasoning for operations teams.

Deployment Checklist

  • Validate tool selection behavior on real workflows.
  • Define explicit failure and retry handling policies.
  • Log tool invocation outcomes for audit review.
  • Set budget thresholds for high-volume agent traffic.
  • Maintain fallback path for degraded tool routing.

Parameter Guidance

response_format

Use strict schemas for tool call arguments and action payloads.

structured_outputs

Required for stable orchestration in enterprise automation.

temperature

Keep low for deterministic tool invocation behavior.

max_tokens

Cap outputs to prevent runaway chains in agent loops.

Knowledge Hub

Gemini 3.1 Pro Preview Custom Tools FAQs

It is optimized for more reliable tool-selection behavior in agentic workflows.
Usually no. Its main value is in tool orchestration rather than plain conversation.
Monitor tool call success rates, incorrect invocations, and cost per completed automation.

Deploy This Model With Governance

Use policy controls, role-based access, and budget guardrails before enabling advanced model tiers at scale.

Use Gemini 3.1 Pro Preview Custom Tools in your company