Qwen 3.5 Plus

alibaba/qwen3.5-plus

A chat model with a 1M-token context window, at $0.42 per million input tokens and $2.52 per million output tokens.

Details

Maker: alibaba
Kind: Chat
Context window: 1,000,000 tokens
Max output: 64,000 tokens
Input: $0.42 per million tokens
Cached input: $0.042 per million tokens, 90% off
Cache write: $0.525 per million tokens
Output: $2.52 per million tokens
Capabilities: Reasoning, tool use, vision, file input
Takes: Text, image, pdf
Returns: Text
Zero data retention: Yes, on every provider
No training on requests: Yes, on every provider
Released: 2026-02-16
Newer model: alibaba/qwen3.7-plusReleased later by the same maker, costs no more, and lists the same capabilities. Compare the two

Description

The Qwen3.5 native vision-language series Plus models are built on a hybrid architecture that integrates linear attention mechanisms with sparse mixture-of-experts models, achieving higher inference efficiency. In a variety of task evaluations, the 3.5 series consistently demonstrates performance on par with state-of-the-art leading models. Compared to the 3 series, these models show a leap forward in both pure-text and multimodal capabilities.

Call it

curl

curl https://phantom.codes/v1/chat/completions \
  -H "Authorization: Bearer $PHANTOM_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "alibaba/qwen3.5-plus",
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Set PHANTOM_KEY to your key. Any OpenAI client works with the base URL https://phantom.codes/v1.

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