Model card

GPT-5.4

lx1-gpt-5.4FrontierLive in the catalog

A step down in price from 5.5 and barely one in capability. For the large majority of frontier-class work — hard reasoning, careful tool use, long context — it lands the same answers for less, which makes it the sensible default when you want GPT-5 quality without the very top rate.

Context window400K tokens

Input · per Mtok$1.25

Output · per Mtok$10

Served byLayer X1 engine

Where it earns its keep[01/03]

01Near-flagship reasoning at a lower price
02Reliable structured tool output
03400K context

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.

VisionYes

Reads images — screenshots, diagrams, and UI states — inline in the conversation.

Behind the endpoint[02/03]

One endpoint. Served by our engine.

GPT-5.4 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-5.4",
    "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.