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We routed our support chat to the Qwen3.5 35B A3B API and latency dropped enough that agents stopped noticing the model in the loop.
Qwen3.5 35B A3B is a Mixture-of-Experts chat model from Alibaba Qwen with 35B total and about 3B active parameters, fast and affordable for chat, coding, and multilingual work. Served on RouterBase over an OpenAI-compatible endpoint at $0.213 / 1M input and $1.70 / 1M output, 15% below list.
Input
Qwen3.5 35B A3B
Hi! I'm a helpful AI assistant. What can I do for you?
Qwen3.5 35B A3B API - Efficient MoE, 3B Active
The Qwen3.5 35B A3B API runs a Qwen3.5 Mixture-of-Experts model, 35B total and about 3B active, for fast, affordable chat, coding, and multilingual work.
The Qwen3.5 35B A3B API serves Alibaba Qwen3.5 35B A3B, a Mixture-of-Experts model with 35 billion total parameters and only about 3 billion active per token. The router picks a small slice of experts each step, so answers arrive with small-model latency and cost while drawing on far deeper knowledge. That makes the Qwen3.5 35B A3B API a strong fit for high-volume chat, drafting, summarization, coding help, and multilingual assistants, where unit economics matter.
You reach the Qwen3.5 35B A3B API through RouterBase over the OpenAI chat-completions protocol, so existing clients work unchanged and one key covers the whole catalog. Billing is $0.213 per 1M input tokens and $1.70 per 1M output tokens, 15% below the list rate of $0.25 in and $2.00 out, with no per-request fee. Streaming and standard tool calls let you wire the Qwen3.5 35B A3B API into agents, IDE assistants, or batch pipelines without provider-specific glue.
What the Qwen3.5 35B A3B API gives you
Big-model knowledge at small-model cost.
Efficient MoE design
The Qwen3.5 35B A3B API runs a Mixture-of-Experts network with 35B total parameters and about 3B active per token, so answers draw on deep knowledge without paying dense-model latency.
Qwen3.5 generation
Built on the Qwen3.5 line, the model brings sharper instruction following and stronger reasoning than earlier compact Qwen releases, behind the same endpoint shape.
Fast and affordable
With a small active slice per token, the Qwen3.5 35B A3B API keeps latency low and bills $0.213 / 1M input and $1.70 / 1M output, 15% below list.
Multilingual chat
The model handles English, Chinese, and many more languages, so the Qwen3.5 35B A3B API covers multilingual assistants, translation, and support.
Tools and JSON
The Qwen3.5 35B A3B API returns function calls and structured JSON in the standard OpenAI schema, ready for agents and data pipelines.
Streaming, per token
Responses stream over chunked HTTP as tokens generate, and billing stays per token with no request fee on the Qwen3.5 35B A3B API.
Get going
First call to the Qwen3.5 35B A3B API in three steps
Wire it once, then stream.
Create a key
One RouterBase key reaches the Qwen3.5 35B A3B API and every other model in the catalog, so there is nothing provider-specific to set up.
Point your client
Send any OpenAI client to routerbase.com/v1 with model=qwen/qwen3.5-35b-a3b and a messages array; the Qwen3.5 35B A3B API answers on the same chat-completions shape.
Stream and watch usage
The model streams tokens as they generate and returns token usage per response, so cost and latency stay visible on every call to the Qwen3.5 35B A3B API.
Pay only for what you use
RouterBase passes through partner-tier pricing. Compared against the model's official published API rate.
Pay only for what you use
RouterBase passes through partner-tier pricing. Compared against the model's official published API rate.
| Resolution | RouterBase | Official | Save |
|---|---|---|---|
| Input (per 1M) | $0.213 | −15% | |
| Output (per 1M) | $1.700 | −15% |
One run at the default settings (Input (per 1M)) costs $0.213.With $1 you can run this model approximately 4 times.
Official price = Alibaba Qwen list rate for Qwen3.5 35B A3B ($0.25 per 1M input, $2.00 per 1M output). RouterBase serves the Qwen3.5 35B A3B API at $0.213 / $1.70, 15% below list.
Teams building on the Qwen3.5 35B A3B API
High-volume chat at small-model cost.
At $0.213 in and $1.70 out, the Qwen3.5 35B A3B API let us triple our summarization volume without touching the budget line.
The 3B active slice is the trick - the Qwen3.5 35B A3B API answers like a bigger model but streams back almost instantly.
Function calls come back in the standard schema, so our agent stack ran on the Qwen3.5 35B A3B API with zero custom parsing.
We benchmark every release, and the Qwen3.5 35B A3B API holds the best cost-to-quality ratio in our current stack.
Switching from a dense model to the Qwen3.5 35B A3B API was one string change, and our drafting tool got visibly snappier.
Multilingual answers land equally well, which is why our localized chat runs on the Qwen3.5 35B A3B API today.
Streaming from the Qwen3.5 35B A3B API is smooth, so our UI renders token by token without extra buffering work.
JSON extraction jobs that used to need a large model now clear on the Qwen3.5 35B A3B API at a fraction of the cost.
Qwen3.5 35B A3B API - common questions
What to know before you route traffic to it.
The Qwen3.5 35B A3B API is RouterBase hosted access to Alibaba Qwen3.5 35B A3B, a Mixture-of-Experts chat model with 35B total and about 3B active parameters, over an OpenAI-compatible endpoint.