Model card

GPT-5.6 Sol

lx1-gpt-5.6-solFrontierPro planLive in the catalog

The flagship of the GPT-5.6 family. Sol is built for difficult, long-running work where reasoning quality and tool discipline matter more than shaving the last second from a turn. It carries the full 1.05M-token window and supports vision for repository-scale and multimodal sessions. Available on Pro and Max.

Context window1.05M tokens

Input · per Mtok$5

Output · per Mtok$30

Served byLayer X1 engine

Where it earns its keep[01/03]

01Flagship GPT-5.6 reasoning and coding
02Vision and tools across long-running sessions
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 Sol 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-sol",
    "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.