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OpenKey

Qwen3.5 Plus 2026-04-20

QwenReleased Apr 27, 2026

Qwen3.5 Plus (April 2026) is a large-scale multimodal language model from Alibaba. It accepts text, image, and video input and produces text output, with a 1M token context window. This...

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Context window
1M tokens
Max output
66K tokens
Input
text, image, video
Output
text
Tokenizer
Qwen3
Released
Apr 27, 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$0.300$0.0090$0.309
Output$1.80$0.054$1.85
Cache write$0.375$0.011$0.386

Supported parameters

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

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model qwen/qwen3.5-plus-20260420.

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-plus-20260420",
    "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-plus-20260420",
    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-plus-20260420",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Qwen3.5 Plus 2026-04-20 cost via API?
Through OpenKey, Qwen3.5 Plus 2026-04-20 costs $0.309 per 1M input tokens and $1.85 per 1M output tokens. That is the provider price ($0.300 / $1.80) plus a flat 3% fee — nothing else.
What is Qwen3.5 Plus 2026-04-20's context window?
Qwen3.5 Plus 2026-04-20 accepts up to 1M tokens of context and returns up to 66K tokens per request.
Is Qwen3.5 Plus 2026-04-20 OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "qwen/qwen3.5-plus-20260420" using any OpenAI SDK — only the base URL and API key change.
What inputs does Qwen3.5 Plus 2026-04-20 support?
Qwen3.5 Plus 2026-04-20 accepts text, image, video input and produces text output.

More from Qwen

All Qwen models →