GoogleText / ChatGemini 3.1 Pro Preview Custom Tools API: Google AI's chat / LLM model, one key away
Gemini 3.1 Pro Preview Custom Tools via the ApexApi gateway
Gemini 3.1 Pro Preview Custom Tools is a chat / LLM model from Google AI. Call it through ApexApi's unified, OpenAI-compatible API with one `ak-` key, alongside every other model in the catalog. It supports a 1,048,756-token context window, tool / function calling, image (vision) input, and streaming responses. Pricing is $2.40 input and $14.40 output per 1M tokens, billed pay-per-use from your credit balance with no subscription.
Gemini 3.1 Pro Preview Custom Tools is served through ApexApi's unified, OpenAI-compatible API. One key, one format, with smart routing and automatic failover. Provider: Google AI.
Why Gemini 3.1 Pro Preview Custom Tools
1,048,756-token context
Reason over long documents, codebases, and multi-turn history in a single request.
Tool & function calling
Structured outputs and tool orchestration for agentic and automation workloads.
Vision input
Send images alongside text for document, UI, and visual-understanding tasks.
Specifications
- Modality
- chat
- Context window
- 1048.8K tokens
- Max output
- 65.5K tokens
- Streaming
- Yes
- Tool / function calling
- Yes
- Vision input
- Yes
Gemini 3.1 Pro Preview Custom Tools pricing
Pay-per-use. No subscription, no minimums. Buy credits and pay only for what you call. Transparent, per-call pricing across every model.
Getting started with Gemini 3.1 Pro Preview Custom Tools
OpenAI-compatible. Point your client at ApexApi, swap your key, and call it. No new SDK to learn.
from openai import OpenAI
client = OpenAI(
base_url="https://api.apexapi.dev/v1",
api_key="<YOUR_APEXAPI_KEY>",
)
response = client.chat.completions.create(
model="google/gemini-3.1-pro-preview-customtools",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)Gemini 3.1 Pro Preview Custom Tools use cases
What teams build with Gemini 3.1 Pro Preview Custom Tools on ApexApi.
Agents & automation
Tool-using agents that orchestrate multi-step workflows and call APIs.
Coding assistants
Code generation, refactoring, reviews, and multi-file reasoning.
RAG & knowledge apps
Summarization and long-document Q&A grounded in your own data.
Gemini 3.1 Pro Preview Custom Tools vs other models
How it compares, and on ApexApi you can switch between any of them with a single string change, same key, same endpoint.
Gemini 3.1 Pro Preview Custom Tools vs Claude Opus 4.7
Compare Gemini 3.1 Pro Preview Custom Tools against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about Claude Opus 4.7 API →Gemini 3.1 Pro Preview Custom Tools vs GPT-5.5
Compare Gemini 3.1 Pro Preview Custom Tools against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about GPT-5.5 API →Gemini 3.1 Pro Preview Custom Tools vs Gemini 3.1 Pro Preview
Compare Gemini 3.1 Pro Preview Custom Tools against this model on price, capabilities, and latency. A/B them with a single key on ApexApi.
Learn more about Gemini 3.1 Pro Preview API →Why build on ApexApi
One API, every model
OpenAI-compatible. Swap the base URL and key, keep your code. Call 14+ providers and hundreds of models through a single integration.
Smart routing & failover
Per-model provider chains with automatic failover. If one provider degrades, requests route to the next. Your app stays up.
Pay-per-use, no lock-in
Buy credits, pay only for what you call. No subscriptions, no minimums. Switch models anytime with a single string change.
Gemini 3.1 Pro Preview Custom Tools API: FAQ
How do I use the Gemini 3.1 Pro Preview Custom Tools API?
Create an ApexApi key, then point your client at https://api.apexapi.dev/v1 and use the model slug. Send a request to /v1/chat/completions with the model slug. The API is OpenAI-compatible, so most OpenAI SDKs work by changing the base URL and key.
Is the Gemini 3.1 Pro Preview Custom Tools API OpenAI-compatible?
Yes. ApexApi exposes Gemini 3.1 Pro Preview Custom Tools through the same OpenAI-compatible interface used across the whole catalog. Swap the base URL and API key and keep your existing code.
How much does Gemini 3.1 Pro Preview Custom Tools cost on ApexApi?
Pay-per-use. See the live price in the Pricing section above. There's no subscription or minimum; you buy credits and pay only for what you call.
Can I switch from Gemini 3.1 Pro Preview Custom Tools to another model later?
Yes. Change a single string (the model slug) to call any other model in the catalog through the same endpoint and key. No re-integration.
Ready to build with Gemini 3.1 Pro Preview Custom Tools?
One API key. Every major AI model. Pay only for what you use.
Get your API key, free to start