septemberai 1.3.0

September platform SDK — the agentic engine and the citadel model gateway, one client.

septemberai

The Python SDK for the September platform — the agentic engine and the citadel model gateway, one client, sync and async.

# Python (3.10+)
pip install septemberai          # install name
# from september import September   # import name

from september import September

sept = September(api_key=os.environ["SEPTEMBER_API_KEY"])

# agentic engine — stream typed blocks
for block in sept.engine.run("ship the build", craft=True):
    if block.type == "text":
        print(block.payload["text"], end="")

# citadel model gateway
reply = sept.citadel.messages.create(
    {"model": "claude-opus-4-8", "messages": [{"role": "user", "content": "hello"}], "max_tokens": 256}
)

The async client is AsyncSeptember with the identical surface (async for, await). The engine's agentic surface (run/Thread/pause-resume) follows the Claude Agent SDK + Codex thread model; the citadel + engine REST surface follows the Anthropic/OpenAI SDK conventions (resource methods, streaming helpers, auto-pagination, typed errors).

See the documentation for guides and the full per-resource reference.