Qwen3.5 Flash API: Alibaba Cloud's chat / LLM model, one key away
Qwen3.5 Flash via the ApexApi gateway
One of the cheapest million-token models in the catalog. Built for bulk work over long inputs where per-call cost is the constraint. Call it through ApexApi's unified, OpenAI-compatible API with one `ak-` key, alongside every other model in the catalog. It supports a 1,000,000-token context window, tool / function calling, and streaming responses. Pricing is $0.04 input and $0.35 output per 1M tokens, billed pay-per-use from your credit balance with no subscription.
Qwen3.5 Flash is served through ApexApi's unified, OpenAI-compatible API. One key, one format, with smart routing and automatic failover. Provider: Alibaba Cloud.
Why Qwen3.5 Flash
1,000,000-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.
OpenAI-compatible
Drop-in with any OpenAI SDK. Change the base URL and key, keep your code.
Specifications
- Modality
- chat
- Context window
- 1000K tokens
- Max output
- 65.5K tokens
- Streaming
- Yes
- Tool / function calling
- Yes
- Vision input
- —
Qwen3.5 Flash: measured reliability
From real calls ApexApi made to Qwen3.5 Flash during health sweeps over the last 30 days. Our own measurements, not vendor claims.
- Success rate
- 100%
- Avg latency
- 5.3s
- Calls measured
- 1
- Last checked
- Aug 30
See how Qwen3.5 Flash compares against every model we serve on the model rankings.
Qwen3.5 Flash pricing
- A million tokens in and a million out costs $0.38 here, all-in.
- That makes it the 6th cheapest of the 81 chat models we serve, ranked on output price.
- It runs 25.9× cheaper than Qwen3.7 Max, the pricier option from the same maker.
Getting started with Qwen3.5 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="qwen/qwen3.5-flash",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)Qwen3.5 Flash use cases
What teams build with Qwen3.5 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.
Qwen3.5 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.
Qwen3.5 Flash vs Claude Opus 4.7
Compare Qwen3.5 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 →Qwen3.5 Flash vs GPT-5.5
Compare Qwen3.5 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 →Qwen3.5 Flash vs Gemini 3.1 Pro Preview
Compare Qwen3.5 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 →Qwen3.5 Flash API: FAQ
How do I call Qwen3.5 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 `qwen/qwen3.5-flash`. The API is OpenAI-compatible, so an existing OpenAI SDK works once you change the base URL and key.
How much does Qwen3.5 Flash cost on ApexApi?
$0.04 per million input tokens and $0.35 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 Qwen3.5 Flash?
1,000,000 tokens. It can return up to 65,536 tokens in a single response.
Does Qwen3.5 Flash support tool calling and image input?
Qwen3.5 Flash supports tool / function calling and streaming responses, and it does not support image (vision) input.
What should I use instead of Qwen3.5 Flash?
From the same maker, Qwen3.5 Plus is the step up when this one falls short. 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 Qwen3.5 Flash?
One API key. Every major AI model. Pay only for what you use.
Get your API key, free to start