Model card

GPT-5.6 Terra

lx1-gpt-5.6-terraFrontierStarter planLive in the catalog

The balanced GPT-5.6 tier: frontier-scale context, vision, reasoning, and tool use at a rate suited to the main line of a serious agent session. Terra is the family member to choose when you need sustained quality across many turns without paying the flagship rate for every step. Available on Starter, Pro, and Max.

Context window1.05M tokens

Input · per Mtok$2

Output · per Mtok$12

Served byLayer X1 engine

Where it earns its keep[01/03]

01Balanced quality and cost across agent workflows
02Vision, reasoning, and structured tool use
031.05M context with up to 128K output

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-5.6 Terra 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.com/v1/messages \
  -H "x-api-key: lx1_your_key" \
  -H "content-type: application/json" \
  -d '{
    "model": "lx1-gpt-5.6-terra",
    "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 stays the same.
Its inference gets better.

$export ANTHROPIC_BASE_URL=https://api.layerx1.com

Get a key Read the docs

Start free · no card · Launch from $2/mo

One endpoint. Served by our engine.

Your agent stays the same.Its inference gets better.

Your agent stays the same.
Its inference gets better.