Sources & verification notes

Gemini 3.1 Pro Preview Custom Tools

• Exact identifier & access

  Identity and lifecycle apply to this exact identifier and serving surface.

  • Release notes ↗Google AI for Developers · provider-authored · checked Sep 23, 2026
  • gemini-3.1-pro-preview model page ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• First availability

  Effective Feb 19, 2026. Checked Sep 13, 2026. Re-verification needed.

  • Release notes ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• Availability status

  Effective date not established; this is an observation. Checked Sep 13, 2026. Re-verification needed.

  Officially released but absent from the current main catalog and lifecycle table.

  • Release notes ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• Availability status

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Listed as a Preview version and priced on the pricing page; the deprecations table does not list it separately.

  • gemini-3.1-pro-preview model page ↗Google AI for Developers · provider-authored · checked Sep 23, 2026
  • Gemini Developer API pricing ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• Capabilities & limits

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Google documents this endpoint inside the gemini-3.1-pro-preview model table, so the table's limits and capabilities are recorded; it is tuned to prioritize custom tools and bash.

  • gemini-3.1-pro-preview model page ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• Input price

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Derived from the captured rate card's standard token row.

  • Gemini Developer API pricing ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• Output price

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Derived from the captured rate card's standard token row.

  • Gemini Developer API pricing ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• Model card

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Same model table and card as gemini-3.1-pro-preview.

  • Gemini 3 developer guide ↗Google AI for Developers · provider-authored · checked Sep 23, 2026
  • gemini-3.1-pro-preview model page ↗Google AI for Developers · provider-authored · checked Sep 23, 2026
  • Gemini 3.1 Pro model card ↗Google DeepMind · provider-authored · checked Sep 23, 2026
  • Gemini 3 Pro model card (PDF) ↗Google DeepMind · provider-authored · checked Sep 23, 2026

• Full rate card

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  • Gemini Developer API pricing ↗Google AI for Developers · provider-authored · checked Sep 23, 2026

• License

  Effective date not established; this is an observation. Checked Sep 23, 2026.

  Not verified. These sources establish the identifier, not this missing fact.

  • Release notes ↗Google AI for Developers · provider-authored · checked Sep 23, 2026
  • gemini-3.1-pro-preview model page ↗Google AI for Developers · provider-authored · checked Sep 23, 2026