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We swapped our support assistant to the Qwen3.5 27B API and the newer generation fixed instruction drift we had fought for months.
Qwen3.5 27B is a dense 27B chat model from the newest Alibaba Qwen generation, with sharp instruction following and strong coding, math, and multilingual skills. Served on RouterBase over an OpenAI-compatible endpoint at $0.255 / 1M input and $2.04 / 1M output, 15% below list.
Input
Qwen3.5 27B
Hi! I'm a helpful AI assistant. What can I do for you?
Qwen3.5 27B API - Dense 27B, Qwen3.5 Generation
The Qwen3.5 27B API runs Qwen3.5 27B, a dense chat model from the newest Alibaba Qwen generation, strong at chat, coding, and multilingual work.
The Qwen3.5 27B API serves Alibaba Qwen3.5 27B, a dense 27-billion-parameter chat model from the Qwen3.5 generation. The fully dense network keeps quality steady and latency low across chat, coding, math, and reasoning, with sharper instruction following than earlier Qwen releases. You reach the Qwen3.5 27B API through RouterBase over the OpenAI chat-completions protocol, so the client you already use for other providers works unchanged and one key covers the whole catalog.
Qwen3.5 27B was tuned for the work developers ship: multilingual assistants, code generation and review, JSON extraction, and multi-step tool use. The Qwen3.5 27B API bills $0.255 per 1M input tokens and $2.04 per 1M output tokens, 15% below the list rate of $0.30 and $2.40, with no per-request fee. It streams tokens as they generate and returns tool calls in the standard OpenAI schema, so you can wire the Qwen3.5 27B API into agents, IDE assistants, or batch pipelines without provider-specific glue.
What the Qwen3.5 27B API gives you
Current-generation quality at a mid-size price.
Dense 27B model
The Qwen3.5 27B API runs a fully dense 27-billion-parameter network, so quality stays consistent across chat, coding, and reasoning without expert-routing surprises.
Qwen3.5 generation
Built on the newest Alibaba Qwen release, the Qwen3.5 27B API carries sharper instruction following and cleaner structured output than earlier Qwen models.
Multilingual by design
The Qwen family trains across dozens of languages, so the Qwen3.5 27B API handles English, Chinese, and many more for chat, translation, and support.
Coding and math
Strong code generation, review, and math reasoning make the Qwen3.5 27B API a dependable backbone for developer tools and technical assistants.
Tools and JSON
The Qwen3.5 27B API returns function calls and structured JSON in the standard OpenAI schema, ready for agents and data pipelines.
Streaming, per token
The Qwen3.5 27B API streams tokens as they generate and bills per token at $0.255 in and $2.04 out, 15% below list, with no request fee.
Get going
First call to the Qwen3.5 27B API in three steps
Wire it once, then stream.
Create a key
One RouterBase key reaches the Qwen3.5 27B 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/qwen3.5-27b and a messages array; the Qwen3.5 27B 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 27B 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) | $0.255 | −15% | |
| Output (per 1M) | $2.040 | −15% |
One run at the default settings (Input (per 1M)) costs $0.255.With $1 you can run this model approximately 3 times.
Official price = Alibaba Qwen list rate for Qwen3.5 27B ($0.30 per 1M input, $2.40 per 1M output). RouterBase serves the Qwen3.5 27B API at $0.255 / $2.04, 15% below list.
Teams building on the Qwen3.5 27B API
Current-generation chat behind one call.
Dense weights keep the output predictable - the Qwen3.5 27B API scores the same on our evals week after week.
Function calling in the standard schema meant our agents ran on the Qwen3.5 27B API on day one with zero custom parsing.
At $0.255 in and $2.04 out the Qwen3.5 27B API gives us current-generation answers at a mid-size price.
Streaming from the Qwen3.5 27B API is smooth, so our chat UI renders token by token with no extra buffering.
We push JSON extraction through the Qwen3.5 27B API and the structured output comes back clean every time.
The 27B size hits our latency budget, and the Qwen3.5 27B API still handles the hard tickets our small model dropped.
Switching to the Qwen3.5 27B API was one string change - the OpenAI shape did not move at all.
Multilingual coverage sold us on the Qwen3.5 27B API; Spanish and English answers land equally well.
Qwen3.5 27B API - common questions
What to know before you route traffic to it.
The Qwen3.5 27B API is RouterBase hosted access to Alibaba Qwen3.5 27B, a dense 27B chat model from the newest Qwen generation, over an OpenAI-compatible endpoint.