Alibaba QwenFastHigh

Qwen3.8 Flash

Alibaba's Qwen3.8 Flash served through the OpenRouter aggregator (listed 2026-08-26) - a low-cost multimodal reasoning model and the successor to Qwen3.7 Flash, suited for coding assistance, agentic workflows, visual understanding, document and codebase analysis, desktop interaction, chart analysis and long-video analysis. 1M-token context, billed at OpenRouter's actual usage cost.

279/873credits

input / output · per 1M tokens

Very low cost - budget-tier input and output rates

1M-token context window, up to 131K output tokens, multimodal input (text, image, video)

OpenAI-compatible API (chat completions) via /llm/openrouter/v1

Prompt caching with discounted cache reads

Billed at OpenRouter's actual usage.cost - listed rates are estimates

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.txtllms.txt ↗

Model Specifications

Context Window

tokens

Max Output

131K

tokens

Training Cutoff

Not published

Compatible SDK

OpenAI

Capabilities

Vision

Function Calling

Streaming

JSON Mode

System Prompt

Token Pricing (per 1M tokens)

Token Type	Credits	USD Equivalent
Input Tokens	279	$0.19
Output Tokens	873	$0.58
Cached Tokens	29.728	$0.02

* 1,500 credits ≈ $1 (actual charges may vary based on usage)

Quick Start

curl -X POST "https://api.core.today/llm/openrouter/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "qwen/qwen3.8-flash",
  "messages": [
    {
      "role": "user",
      "content": "Summarize the attached report in 5 bullets."
    }
  ],
  "max_tokens": 1024
}'

Parameters

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model ID in vendor/model form, e.g. "qwen/qwen3.8-flash".
`messages`	array	Yes	-	Chat messages in OpenAI format (system/user/assistant roles).
`temperature`	number	No	0.7	Sampling temperature (0-2).
`max_tokens`	integer	No	2048	Maximum completion tokens.
`stream`	boolean	No	false	Stream the response as server-sent events.

Examples

Chat completion

OpenAI-compatible chat completion request via OpenRouter

curl -X POST "https://api.core.today/llm/openrouter/v1/chat/completions" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "qwen/qwen3.8-flash",
  "messages": [
    {
      "role": "user",
      "content": "Summarize the attached report in 5 bullets."
    }
  ],
  "max_tokens": 1024
}'

Tips & Best Practices

1Works with the OpenAI SDK - set base_url to https://ai.api.core.today/llm/openrouter/v1

2Charged at OpenRouter's usage.cost x 1,858 credits/USD - the listed rates are estimates and may lag OpenRouter price changes

3Reasoning tokens count as output - set max_tokens generously for multi-step tasks; qwen/qwen3.7-flash remains the cheaper option for simple high-volume calls