GoogleText / ChatGemini 3.5 Flash API: Google AI's chat / LLM model, one key away
Gemini 3.5 Flash via the ApexApi gateway
The current Flash generation: a million-token window, vision and tool calling at a fraction of Pro pricing. Google's usual answer for high-volume multimodal work. Call it through ApexApi's unified, OpenAI-compatible API with one `ak-` key, alongside every other model in the catalog. It supports a 1,048,576-token context window, tool / function calling, image (vision) input, and streaming responses. Pricing is $1.80 input and $10.80 output per 1M tokens, billed pay-per-use from your credit balance with no subscription.
Gemini 3.5 Flash is served through ApexApi's unified, OpenAI-compatible API. One key, one format, with smart routing and automatic failover. Provider: Google AI.
Why Gemini 3.5 Flash
1,048,576-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
- 1048.6K tokens
- Max output
- 65.5K tokens
- Streaming
- Yes
- Tool / function calling
- Yes
- Vision input
- Yes
Gemini 3.5 Flash: measured reliability
From real calls ApexApi made to Gemini 3.5 Flash during health sweeps over the last 30 days. Our own measurements, not vendor claims.
- Success rate
- 100%
- Avg latency
- 3.3s
- Calls measured
- 1
- Last checked
- Aug 30
See how Gemini 3.5 Flash compares against every model we serve on the model rankings.
Gemini 3.5 Flash pricing
- A million tokens in and a million out costs $12.60 here, all-in.
- For lighter work, Gemma 4 26B A4B from the same maker costs 27.3× less — one string apart on the same key.
- It is one of 33 chat models here with a 1M-token context window.
Getting started with Gemini 3.5 Flash
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-3.5-flash",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)Gemini 3.5 Flash use cases
What teams build with Gemini 3.5 Flash 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 3.5 Flash 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 3.5 Flash vs Claude Opus 4.7
Compare Gemini 3.5 Flash 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 3.5 Flash vs GPT-5.5
Compare Gemini 3.5 Flash 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 3.5 Flash vs Gemini 3.1 Pro Preview
Compare Gemini 3.5 Flash 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 →Gemini 3.5 Flash API: FAQ
How do I call Gemini 3.5 Flash through ApexApi?
Create an ApexApi key, point your client at https://api.apexapi.dev/v1, and POST to /v1/chat/completions with the model set to `google/gemini-3.5-flash`. The API is OpenAI-compatible, so an existing OpenAI SDK works once you change the base URL and key.
How much does Gemini 3.5 Flash cost on ApexApi?
$1.80 per million input tokens and $10.80 per million output tokens, all-in with no separate platform fee. You buy credits and pay per call, with no subscription or minimum.
What is the context window for Gemini 3.5 Flash?
1,048,576 tokens. It can return up to 65,536 tokens in a single response.
Does Gemini 3.5 Flash support tool calling and image input?
Gemini 3.5 Flash supports tool / function calling, image (vision) input, and streaming responses.
What should I use instead of Gemini 3.5 Flash?
From the same maker, Gemini 3 Flash Preview costs less for lighter work. Switching is one string: it runs on the same endpoint and the same key, so there is nothing to re-integrate.
Ready to build with Gemini 3.5 Flash?
One API key. Every major AI model. Pay only for what you use.
Get your API key, free to start