Model card

GPT-OSS 120B

lx1-gpt-oss-120bWorkhorseLive in the catalog

The catalog's default for a reason: a large open-weight flagship that answers fast, follows instructions cleanly, and holds up across long agent runs. If you don't name a model, this is the one serving you — and for most day-to-day agent work it's all you need.

Context window128K tokens

Input · per Mtok$0.35

Output · per Mtok$0.75

Served byLayer X1 engine

Where it earns its keep[01/03]

01Fast responses that keep agent loops moving
02Reliable tool calling across long runs
03Reasoning on demand without premium pricing

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 120B is served through the Layer X1 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.layerx1.in/v1/messages \
  -H "x-api-key: lx1_your_key" \
  -H "content-type: application/json" \
  -d '{
    "model": "lx1-gpt-oss-120b",
    "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.layerx1.in

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.