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Gemini 3 Pro (Preview)

Google · Gemini 3

Deprecated Gemini 3 preview model retained as historical context ahead of shutdown and migration to Gemini 3.1 Pro Preview.

Part of Gemini Pro family · Other versions: Gemini 3.1 Pro Preview , Gemini 2.5 Pro
Type
multimodal
Context
1M tokens
Max Output
66K tokens
Status
deprecated
Input
$2/1M tok
Output
$12/1M tok
API Access
Yes
License
proprietary
multimodal reasoning long-context tool-use video-understanding agentic
Released November 2025 · Updated March 6, 2026

Overview

Freshness note: Model capabilities, limits, and pricing can change quickly. This profile is a point-in-time snapshot last verified on February 15, 2026.

Gemini 3 Pro (Preview) was Google’s initial Gemini 3 preview model for advanced multimodal, agentic, and long-context reasoning. As of March 6, 2026, Google’s pricing docs mark it as deprecated and state that it will be shut down on March 9, 2026, with migration directed to Gemini 3.1 Pro Preview.

Within Google’s lineup, Pro Preview was the quality-first option, while Flash models remained tuned for lower latency and lower cost at scale.

Capabilities

Gemini 3 Pro Preview is strongest in:

  • Long-context reasoning over large documents and mixed evidence.
  • Multimodal understanding across text, image, audio, and video workflows.
  • Tool-enabled agent use cases where planning and iterative execution are required.
  • Complex summarization and synthesis tasks with tight instruction constraints.
  • Enterprise copilots that need broad capability coverage in a single endpoint.

Its 1M-token context window is especially useful for legal review, policy analysis, and cross-document technical investigations.

Technical Details

Google model docs describe Gemini 3 Pro Preview with:

  • 1,048,576 token context window.
  • 65,536 max output tokens.
  • Multimodal input support including text, images, audio, and video.
  • Preview status, and now an explicit deprecation notice with a March 9, 2026 shutdown date.

For production teams, the implication is clear: migrate to Gemini 3.1 Pro Preview or a stable Gemini 2.5 tier immediately, and keep explicit fallback models in place.

Pricing & Access

Standard API pricing (<=200K input tokens, per 1M tokens):

  • Input: $2.00
  • Output: $12.00

Higher rates apply above 200K input tokens. Prompt caching and batch paths are available in the platform pricing model.

Access options include:

  • Gemini API via Google AI Studio / Vertex AI
  • Google Cloud deployment patterns with enterprise controls

Because this model supports very large contexts, monitoring token spend and retrieval discipline is critical.

Best Use Cases

Use this page as a historical reference when you need:

  • Historical comparison against Gemini 3.1 Pro Preview.
  • A reference point for earlier Gemini 3 preview pricing and capability assumptions.
  • Migration planning for systems still pinned to the deprecated preview.

For active deployments, route new work to Gemini 3.1 Pro Preview or Gemini 2.5 Pro instead.

Comparisons

  • Gemini 3.1 Pro Preview (Google): Direct migration target in Google’s current docs.
  • GPT-5.4 (OpenAI): Premium OpenAI alternative in tool-centric ecosystems.
  • Claude Opus 4.6 (Anthropic): Top option for instruction-heavy enterprise reasoning; Gemini offers broader first-party multimodality in one model tier.
  • Grok 4 (xAI): Grok is competitive on frontier reasoning and real-time oriented workflows; Gemini Pro Preview currently has more mature cloud enterprise integration patterns.