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1#!/usr/bin/env python32"""stop_sequences with the Python SDK → stop_reason == 'stop_sequence' and msg.stop_sequence == '3'.34STATUS: LIVE_VERIFIED 2026-09-18 with anthropic 1.7.0 (.venv). Run: .venv/bin/python examples/anthropic/messages/stop_sequences.py5Key comes from .env (loaded by scripts/live.py); never printed.6"""7import sys8from pathlib import Path910sys.path.insert(0, str(Path(__file__).resolve().parents[3]))11from scripts import live # noqa: E402 (loads .env, gives log_request)12from anthropic import Anthropic # noqa: E4021314client = Anthropic()15MODEL = "claude-haiku-4-5-20251001"16msg = client.messages.create(model=MODEL, max_tokens=32, stop_sequences=["3"], system="Output only what is asked.",17 messages=[{"role": "user", "content": "Count: 1 2 3 4 5"}])18print(repr(msg.content[0].text if msg.content else ""), msg.stop_reason, msg.stop_sequence)19assert msg.stop_reason == "stop_sequence" and msg.stop_sequence == "3"20live.log_request("anthropic", "POST", "/v1/messages", 200, 0.00005, "example stop_sequences.py")21