qwen3-5-9b
Qwen3.5-9B is a multimodal foundation model from the Qwen3.5 family, delivering reasoning, coding and visual understanding in an efficient 9B-parameter unified vision-language design.
Pricing: Input 17 credits / 1M tokens (≈ $0.09), Output 25 credits / 1M tokens (≈ $0.13).
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Qwen3.5-9B API on ModelFold
Qwen3.5-9B is a multimodal foundation model from the Qwen3.5 family, delivering reasoning, coding and visual understanding in an efficient 9B-parameter unified vision-language design. Try Qwen3.5-9B in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Qwen3.5-9B API
Qwen3.5-9B at a glance
Qwen3.5-9B is a chat model from Qwen. It accepts text, images and video as input and returns text, with a context window of up to 262K tokens.
Use it without hosting anything
On ModelFold you call Qwen3.5-9B with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Qwen3.5-9B
Up to 262K tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Understands images and video
Besides text, Qwen3.5-9B accepts images and video as input, so a single request can combine instructions with visual or other media.
Function calling
Qwen3.5-9B supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Reasoning mode
Qwen3.5-9B can produce reasoning before its final answer; in the Playground you can switch reasoning on or off to compare results.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
How to Use Qwen3.5-9B on ModelFold
- 1
Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Qwen3.5-9B responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
- 3
Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "qwen3-5-9b" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
- ✓
Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with Qwen3.5-9B
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
Screenshot and image understanding
Read screenshots, charts, diagrams and photos alongside text — for UI review, visual QA or turning images into structured data.
AI coding assistants
Generate, explain, debug and refactor code, review pull requests and work through multi-file changes in developer tools and IDE plugins.
Analysis and complex reasoning
Work through research questions, data interpretation, planning and other problems that need careful step-by-step reasoning.
Frequently Asked Questions
What is Qwen3.5-9B?⌄
Qwen3.5-9B is a multimodal foundation model from the Qwen3.5 family, delivering reasoning, coding and visual understanding in an efficient 9B-parameter unified vision-language design.
Which inputs does Qwen3.5-9B support?⌄
Qwen3.5-9B accepts text, images and video and returns text. Through ModelFold you can send text and images (OpenAI-style image_url content); in the Playground you can also attach documents, which are converted to text.
How long is the context window of Qwen3.5-9B?⌄
Up to 262K tokens, shared between your input and the model’s output.
Does Qwen3.5-9B support function calling?⌄
Yes. Qwen3.5-9B supports tools / function calling through the standard tools parameter of the chat completions API.
How is Qwen3.5-9B billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call Qwen3.5-9B through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "qwen3-5-9b", using your ModelFold API key as the Bearer token.
| Input | 17 credits 1M tokens≈ $0.09 |
| Output | 25 credits 1M tokens≈ $0.13 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"qwen3-5-9b","messages":[{"role":"user","content":"Hello"}]}'