Model card

Qwen3.5 Flash

sdn-qwen3.5-flashLong contextLive in the catalog

The standout budget row of the Qwen line: a full million-token window at a flat price that stays flat no matter how much you feed it. Built for reading at scale — logs, corpora, transcripts — where the job is holding everything in view and the bill has to stay boring.

Context window1M tokens

Input · per Mtok$0.1

Output · per Mtok$0.4

Served bySideren engine

Where it earns its keep[01/03]

01Flat pricing all the way to 1M input tokens
02Cheap enough to run continuously
03Tools and reasoning still included

Capabilities

Tool callingYes

Strict, schema-faithful tool calls, enforced by the engine on every request — safe to build an agent loop on.

ReasoningYes

Thinks before it answers. Budget max_tokens generously — hidden reasoning counts against it.

VisionNo

Text-only.

Behind the endpoint[02/03]

One endpoint. Served by our engine.

Qwen3.5 Flash is served through the Sideren engine — zero-downtime serving is the design target, not a status-page apology. You request it by name; everything else is our problem.

Call it by name

curl https://api.sideren.io/v1/messages \
  -H "x-api-key: sdn_your_key" \
  -H "content-type: application/json" \
  -d '{
    "model": "sdn-qwen3.5-flash",
    "max_tokens": 1024,
    "messages": [{ "role": "user", "content": "Hello" }]
  }'

OpenAI-style clients work too — send the same model name to /v1/chat/completions with a Bearer key. See the docs for both dialects.

Your agent doesn't change.
Everything underneath does.

$export ANTHROPIC_BASE_URL=https://api.sideren.io

Get a key Read the docs

Start free · no card · Starter from $5/mo

One endpoint. Served by our engine.

Your agent doesn't change.Everything underneath does.

Your agent doesn't change.
Everything underneath does.