Skip to main content
You don’t need a new SDK. Add one line to what you already have.
That’s it. Works with GPT-4o, Claude, Gemini, DeepSeek, Llama, Grok, Mistral, Qwen, and 2,050+ model combinations via OpenRouter.
The base_url is required — Stratus does not auto-detect it. Set STRATUS_API_KEY to your Stratus key (stratus_sk_live_...). No LLM provider key needed to get started — Formation’s pool handles requests automatically. See Authentication for details and BYOK options.

Installation

You already have this. Nothing new to install.

Making Calls

Chat Completions

Messages (Anthropic-style)

Works with Anthropic’s client too:

Streaming


Models

stratus-x1ac-small-gpt-4o-mini

Lowest cost. Simple classification, routing, and action selection.

stratus-x1ac-base-gpt-4o

Balanced. Most use cases — web navigation, form completion, task planning.

stratus-x1ac-large-gpt-4o

Complex reasoning. Multi-step workflows, cascade prediction, concurrent coordination.

stratus-x1ac-base-claude-sonnet-4-5

Claude backbone. Best for long-context planning and nuanced state reasoning.
See Models for the full list and credit costs per model.

The stratus Response Field

Every response includes planning metadata from the X1 world model:
Use confidence as a gate before executing:

Optional: stratus-sdk-py

For vector compression and trajectory simulation, install the Stratus Python SDK:

Rollout (Pre-Execution Simulation)

Simulate a full action plan before anything executes:
Or call the endpoint directly — no extra package needed:

Vector Compression

Compress embedding vectors 10–20× with 99%+ quality:

Next Steps

Authentication

Set up your Stratus key. Optionally add provider keys to remove the Formation pool markup.

Tutorials

Real-world agents — navigation, cascades, concurrency.

API Reference

Full endpoint docs, parameters, and error codes.