Qwen3.5 397B A17B

qwenqwen/qwen3.5-397b-a17b

Alibaba's Qwen3.5 MoE (397B total / 17B active params).

Official model page ↗Alibaba Cloud Model Studio — text generation models (legacy and recommended lists) ↗

Qwen3.5 397B A17B is Alibaba's mixture-of-experts model in the Qwen3.5 generation (397B total parameters, 17B active per token), verified live 2026-07-27.

Since the Oct 15, 2026 update of Alibaba Cloud Model Studio's text-generation guide, Alibaba lists qwen3.5-397b-a17b under legacy models that are no longer recommended. Legacy is not retirement: the model is still served and remains available on TheRouter as qwen/qwen3.5-397b-a17b. For new workloads, Alibaba's recommended tiers are qwen3.7-plus (qwen/qwen3.7-plus) for balanced performance and cost, and qwen3.8-max (qwen/qwen3.8-max) for the strongest reasoning.

Best for

• Cost-efficient general-purpose text tasks at MoE-class throughput

Reach for something else if

• New integrations: Alibaba lists qwen3.5-397b-a17b as legacy and no longer recommended since its Oct 15, 2026 docs update; start with qwen/qwen3.7-plus or qwen/qwen3.8-max instead
• Vision or multimodal tasks — this model is text-only in this catalog

Context Length

262K

Max Output

33K

Input Priceper 1M tokens

$0.648/ 1M tokens

Output Priceper 1M tokens

$3.89/ 1M tokens

Modalities

text→text

Pricing Breakdown

Type	Rate
Input	$0.648 / 1M tokens
Output	$3.89 / 1M tokens

Supported Parameters

temperaturemax_tokenstop_ptoolstool_choiceresponse_formatstop

Specifications

Release date	Not publicly disclosed	unknown
License	Open-weight (per Qwen family convention)	to verify

Benchmarks

Benchmark	Distribution	Score	Source
Not publicly disclosed	—	Not publicly disclosed	—

API Usage Examples

Use the global api.therouter.ai endpoint shown below for new integrations; the legacy China accelerated endpoint is retired.

cURL

curl https://api.therouter.ai/v1/chat/completions   -H "Content-Type: application/json"   -H "Authorization: Bearer $THE_ROUTER_API_KEY"   -d '{
    "model": "qwen/qwen3.5-397b-a17b",
    "messages": [
      {"role": "user", "content": "Summarize the key points from this input."}
    ]
  }'

API guide

Chat completion

cURL

curl https://api.therouter.ai/v1/chat/completions \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"qwen/qwen3.5-397b-a17b","messages":[{"role":"user","content":"Hello"}]}'

News & changes

2026-10-15

Alibaba moves Qwen3.5 397B A17B to its legacy model list

The Oct 15, 2026 update of the Model Studio text-generation guide lists qwen3.5-397b-a17b, together with qwen3.5-plus, qwen3.5-flash, qwen3.5-122b-a10b, qwen3.5-27b, and qwen3.5-35b-a3b, as legacy and no longer recommended. Alibaba's recommended Qwen tiers are now qwen3.8-max, qwen3.8-flash, qwen3.7-plus, and qwen3.7-flash. qwen/qwen3.5-397b-a17b stays available on TheRouter.

re-authored by TheRouteralibabacloud.com ↗

Fact ledger — every claim on this page traces here

source	URL	retrieved
Release date	—	—	unknown
License	—	—	to verify
Not publicly disclosed	qwenlm.github.io ↗	2026-07-27	unknown
Alibaba moves Qwen3.5 397B A17B to its legacy model list	alibabacloud.com ↗	2026-10-19	verified