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OpenKey

Qwen3.5-Flash

QwenReleased Feb 25, 2026

The Qwen3.5 native vision-language Flash models are built on a hybrid architecture that integrates a linear attention mechanism with a sparse mixture-of-experts model, achieving higher inference efficiency. Compared to the...

Try in playground
Context window
1M tokens
Max output
66K tokens
Input
text, image, video
Output
text
Tokenizer
Qwen3
Released
Feb 25, 2026
Reasoning
optional

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$0.065$0.0019$0.067
Output$0.260$0.0078$0.268

Supported parameters

  • include_reasoning
  • max_tokens
  • presence_penalty
  • reasoning
  • response_format
  • seed
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model qwen/qwen3.5-flash-02-23.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen/qwen3.5-flash-02-23",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="qwen/qwen3.5-flash-02-23",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "qwen/qwen3.5-flash-02-23",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Qwen3.5-Flash cost via API?
Through OpenKey, Qwen3.5-Flash costs $0.067 per 1M input tokens and $0.268 per 1M output tokens. That is the provider price ($0.065 / $0.260) plus a flat 3% fee — nothing else.
What is Qwen3.5-Flash's context window?
Qwen3.5-Flash accepts up to 1M tokens of context and returns up to 66K tokens per request.
Is Qwen3.5-Flash OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "qwen/qwen3.5-flash-02-23" using any OpenAI SDK — only the base URL and API key change.
What inputs does Qwen3.5-Flash support?
Qwen3.5-Flash accepts text, image, video input and produces text output.

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