Qwen3.5 Plus API
Alibaba
Qwen3.5 Plus — enhanced Alibaba model with 1M context
About Qwen3.5 Plus
Qwen3.5 Plus is a large language model developed by Alibaba. It's particularly well-suited for orchestrating tool-using agents that call APIs and external services, producing structured outputs for reliable data extraction, and handling large contexts of up to 1M tokens. Its 1M-token context window means you can pass in entire documents, codebases, or conversation histories without losing context. Developers choose Qwen3.5 Plus when they need reliable, production-quality AI inference through a simple API — and on Qubax, it's available at a fraction of the cost of traditional providers.
In the broader AI landscape, Qwen3.5 Plus sits among the capable offerings from Alibaba With agentic tool use, it competes with the most capable models on the market. What sets it apart on Qubax isn't just the model itself — it's the accessibility. Rather than dealing with enterprise contracts or traditional payment rails, you get instant access via an OpenAI-compatible endpoint. That means you can drop Qwen3.5 Plus into Cursor, Cline, LangChain, or any framework that speaks the OpenAI protocol and start building immediately.
Qubax offers Qwen3.5 Plus at 3% below OpenRouter's price — just $0.252 per million input tokens and $1.51 per million output tokens. That pricing advantage compounds quickly at scale: a high-volume application sending millions of tokens per day can save significantly compared to using OpenRouter or the provider directly. And because Qubax runs on crypto-native infrastructure, you can pay with USDC, USDT, ETH, BTC, or 200+ other cryptocurrencies — no credit card or bank account required. New users even get $1 in free credits to test Qwen3.5 Plus risk-free before committing.
Pricing
| Token Type | Qubax | OpenRouter | You Save |
|---|---|---|---|
| Input (per 1M tokens) | $0.252 | $0.260 | 3% |
| Output (per 1M tokens) | $1.51 | $1.56 | 3% |
Prices per 1 million tokens. Pay with 200+ cryptocurrencies.
Estimated Monthly Cost
Specifications
Use Cases
Capabilities
Quick Start
from openai import OpenAI
client = OpenAI(
base_url="https://api.qubax.ai/v1",
api_key="qbx_live_YOUR_API_KEY",
)
response = client.chat.completions.create(
model="qwen3.5-plus",
messages=[
{"role": "user", "content": "Hello!"}
],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.qubax.ai/v1",
apiKey: "qbx_live_YOUR_API_KEY",
});
const response = await client.chat.completions.create({
model: "qwen3.5-plus",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);curl https://api.qubax.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer qbx_live_YOUR_API_KEY" \
-d '{
"model": "qwen3.5-plus",
"messages": [{"role": "user", "content": "Hello!"}]
}'Get your API key from the dashboard. New users get $1 free credits.
Why use Qwen3.5 Plus on Qubax?
3% Cheaper
Up to 3% off OpenRouter prices
Pay with Crypto
200+ coins (BTC, ETH, SOL, USDT, USDC & more). No credit card needed.
OpenAI Compatible
Drop-in replacement. Works with Cline, Cursor, any tool.
More from Alibaba
Compare Qwen3.5 Plus with alternatives
| Model | Provider | Input / 1M | Output / 1M | vs Qwen3.5 Plus |
|---|---|---|---|---|
| Qwen3.5 Plus | Alibaba | $0.252 | $1.51 | — |
| NVIDIA Nemotron 3 Ultra 550B | Other | $0.130 | $0.650 | Cheaper |
| GPT 5 Mini | OpenAI | $0.242 | $1.94 | Cheaper |
| MiniMax M2.1 | MiniMax | $0.291 | $1.16 | More expensive |
| GLM 5.1 Non-thinking (Morpheus Web) | Zhipu AI | $0.195 | $0.650 | Cheaper |
Frequently Asked Questions
How much does the Qwen3.5 Plus API cost?
On Qubax, Qwen3.5 Plus costs $0.252 per 1M input tokens and $1.51 per 1M output tokens. This is 3% cheaper than OpenRouter's price of $0.260 per 1M input tokens.
Is the Qwen3.5 Plus API compatible with OpenAI?
Yes. Qubax provides an OpenAI-compatible API. You can use Qwen3.5 Plus as a drop-in replacement by changing your base URL to https://api.qubax.ai/v1 and using your Qubax API key. It works with Cline, Cursor, OpenCode, Hermes Agent, and any tool that supports OpenAI APIs.
Why is Qwen3.5 Plus cheaper on Qubax than OpenRouter?
Qubax sources AI inference from the Surplus Intelligence marketplace, an open marketplace on the Base blockchain where compute providers compete on price. We pass the savings to you — 3% cheaper than OpenRouter's price for Qwen3.5 Plus.
How do I pay for Qwen3.5 Plus API usage?
Qubax uses prepaid crypto credits. Deposit USDC on the Base chain and your balance is automatically deducted as you use the API. New users get $1 in free credits to start. No credit card required.
What is the context window of Qwen3.5 Plus?
Qwen3.5 Plus supports a context window of 1M tokens, allowing you to process large documents, codebases, or long conversations in a single request.
What can I build with Qwen3.5 Plus?
Qwen3.5 Plus is versatile enough for a wide range of applications. You can use it to build autonomous agents that call external tools and APIs, generate structured JSON output for data pipelines, process long documents and entire codebases, and more. Because it's served through Qubax's OpenAI-compatible API, integration into existing apps, agents, or workflows takes just a few lines of code.
How fast is Qwen3.5 Plus on Qubax?
Qwen3.5 Plus on Qubax supports streaming responses, so tokens begin arriving in real time as they're generated. Latency depends on the provider and prompt complexity, but most requests start streaming within 200–800 milliseconds. Qubax routes requests through the Surplus Intelligence marketplace, which selects the fastest available compute provider for each request — so you get competitive latency at a lower price.
Qwen3.5 Plus vs NVIDIA Nemotron 3 Ultra 550B: which should I choose?
Qwen3.5 Plus by Alibaba and NVIDIA Nemotron 3 Ultra 550B by Other are both strong models in a similar price tier. Qwen3.5 Plus is well-suited for general-purpose language tasks. NVIDIA Nemotron 3 Ultra 550B comes from a different lab and may have different strengths depending on your workload. On Qubax, Qwen3.5 Plus starts at $0.252/1M input tokens while NVIDIA Nemotron 3 Ultra 550B comes in at $0.130/1M, so NVIDIA Nemotron 3 Ultra 550B may be worth considering if you need to minimize per-token cost. Both are available on Qubax with crypto payments and OpenAI-compatible APIs, so you can try each and switch freely.
Can I use Qwen3.5 Plus for commercial projects?
Yes. Qwen3.5 Plus on Qubax can be used for commercial purposes. You own the outputs you generate. Qubax provides the API infrastructure — you bring your use case.
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