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Qwen: Qwen3.5 Plus Thinking

qwen3.5-plus:thinking

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Qwen3.5 Plus Thinking costs $0.520 per million input tokens and $3.12 per million output tokens, supports 984K context, and is available through the OpenAI-compatible API.

Qwen 3.5 Plus with extended reasoning. A commercial model with hybrid linear attention and sparse MoE architecture. Supports text, image, and video input with a 1M context window.

Modalities

Text + Image + Video → Text

Input / output price

$0.520 / $3.12 per 1M

Context

984K · max output 66K

Capabilities

ReasoningVisionLong context

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$0.520
Output$3.12
Cached input$0.052

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00406
Per day
$2.03
Per month (30 days)
$60.84

Qwen3.5 Plus Thinking: input $0.52/M · output $3.12/M · cached input $0.052/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "qwen3.5-plus:thinking", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to qwen3.5-plus:thinking.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen3.5-plus:thinking",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is Qwen3.5 Plus Thinking billed?
Input is $0.520 and output is $3.12 per million tokens; cached input is $0.052. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
984K tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
Qwen3.5 Plus Thinking API pricing · GeniusRelay