Gemini 3 Pro Preview
Gemini 3 Pro Preview is a legacy integration reference; keep it only while you identify a current replacement.
Use it for
- Teams maintaining an existing integration
- Workloads that can use a 1m context window
- Buyers comparing 2 tracked provider routes
Do not use it for
- New production launches
- Family
- Gemini 3
- Released
- 2025-09-01
- Context
- 1m
- Architecture
- Decoder Only
- Specialization
- general
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Training
- Pretrained
Cheapest of 2 routes · GCP Vertex AI
About
Deprecated/shut down March 9, 2026. Vertex: $0.20/$12.00 (<=200K), $0.40/$18.00 (>200K). Migrate to Gemini 3.1 Pro.
Gemini 3 Pro Preview is a proprietary model in the Gemini 3 family. The structured metadata tracks a 1m-token context window, multimodal input, function calling, tool use, and structured outputs. This page tracks provider routes through GCP Vertex AI and Vercel AI Gateway, with the cheapest tracked route listed at $2 input and $12 output per 1M tokens. No headline benchmark score is tracked for Gemini 3 Pro Preview yet.
Top use-case fit: coding, agents, and build tasks
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Long context
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare all 2Compare API pricing across 2 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| GCP Vertex AI | $2.00 | $12.00 | - | Serverless |
| Vercel AI Gateway | $2.00 | $12.00 | read $0.200 | Serverless |
Available via routers & gateways(13)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.
AIRouter
RouterCommercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.
Helicone
GatewayObservability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.
Kong AI Gateway
GatewayMulti-LLM AI gateway built on Kong Gateway 3.x, adding semantic routing, load balancing, guardrails, and MCP traffic analytics as plugins over Kong's existing API management platform.
Capabilities
Benchmark peer barsfor RAG
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
Frequently asked questions
What is the context window of Gemini 3 Pro Preview?
Gemini 3 Pro Preview has a context window of 1m tokens.
How much does Gemini 3 Pro Preview cost?
Gemini 3 Pro Preview pricing ranges from $2.00/1M to $2/1M input tokens depending on the provider.
When was Gemini 3 Pro Preview released?
Gemini 3 Pro Preview was released on 2025-09-01.
Which providers offer Gemini 3 Pro Preview?
Gemini 3 Pro Preview is available from 2 providers: GCP Vertex AI, Vercel AI Gateway.
Cheapest of 2 routes · GCP Vertex AI