Qwen3.8 Flash API: Pricing, Context Window and Setup

Qwen3.8 Flash is Alibaba's volume Qwen3.8, live as model ID qwen3.8-flash. The list price is $0.15 per 1M input tokens and $0.47 per 1M output tokens, with a 1,000,000-token context window.

It is not a cheaper Qwen3.8-Max. Max stays at $2 / $6, takes images, and is the flagship. Flash is the text-only sibling for classification, extraction, and high-frequency turns.

Qwen3.8 Flash API pricing #

A $5 prepaid balance buys roughly 33 million input tokens, or 10.6 million output tokens, if a workload used only one category. Real requests mix both.

Flash vs Max vs the rest of Qwen #

Flash is more than 13× cheaper than Max on input and about 13× cheaper on output. That only helps if the task does not need Max's image input or flagship quality.

Cost per agent turn #

One 40,000-token prompt returning 2,000 tokens, no cache:

The arithmetic for Flash: 40,000 × $0.15 / 1M + 2,000 × $0.47 / 1M = $0.006 + $0.00094 = $0.00694.

Live pages: Qwen3.8 Flash, Qwen3.8-Max, Qwen3.7-Plus.

Qwen3.8 Flash specifications #

If a client tries to attach an image to qwen3.8-flash, expect an upstream error. Use qwen3.8-max for multimodal turns.

Call Qwen3.8 Flash with RouterPlex #

curl https://api.routerplex.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTERPLEX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen3.8-flash",
    "messages": [
      {"role": "user", "content": "Classify this ticket as billing, bug, or feature request."}
    ]
  }'

import os
from openai import OpenAI
 
client = OpenAI(
    api_key=os.environ["ROUTERPLEX_API_KEY"],
    base_url="https://api.routerplex.com/v1",
)
 
response = client.chat.completions.create(
    model="qwen3.8-flash",
    messages=[{"role": "user", "content": "Extract the action items from these notes."}],
)
 
print(response.choices[0].message.content)

Claude Code can point at the same model with ANTHROPIC_BASE_URL=https://api.routerplex.com and model qwen3.8-flash. See the Claude Code setup guide.

Which Qwen3.8 should you actually call? #

• Volume text work — qwen3.8-flash. Classification, extraction, cheap agent steps.
• Images, or the flagship — qwen3.8-max at $2 / $6. See the Qwen3.8-Max pricing post.
• A Flash with vision from another lab — GLM-5.3 Flash at $0.15 / $0.50, or Gemini 3.8 Flash at the intro $0.75 / $3.75.

Give the Flash key its own hard budget. The live Qwen3.8 Flash page is the number this route will actually bill.