Model card

GPT-OSS 20B

sdn-gpt-oss-20bFastLive in the catalog

The sprinter of the catalog. When the job is classification, extraction, short answers, or quick tool dispatch, the 20B gets there fastest — and still carries tools and reasoning, so it doesn't fall over the moment a task gets slightly interesting.

Context window128K tokens

Input · per Mtok$0.2

Output · per Mtok$0.3

Served bySideren engine

Where it earns its keep[01/03]

01Fastest responses in the catalog
02Tools + reasoning despite the small size
03Perfect for classify / extract / dispatch turns

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.

GPT-OSS 20B 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-gpt-oss-20b",
    "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.