Anthropic SDK & Claude Agent SDK

pip install anthropic

from anthropic import Anthropic

client = Anthropic(
    auth_token="YOUR_VALAR_API_KEY",
    base_url="https://api.valarhq.ai",  # no /v1 — the SDK appends it
)

message = client.messages.create(
    model="zai-org/GLM-5.2",
    max_tokens=2048,
    messages=[{"role": "user", "content": "Explain transformers in one sentence."}],
)

# Models may emit thinking blocks before the text response — extract the text block.
text = next(block.text for block in message.content if block.type == "text")
print(text)
print(message.stop_reason, message.usage.input_tokens, message.usage.output_tokens)

with client.messages.stream(
    model="zai-org/GLM-5.2",
    max_tokens=2048,
    messages=[{"role": "user", "content": "Explain transformers."}],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)
    final = stream.get_final_message()

# Body — the natural path for the Anthropic SDK
message = client.messages.create(
    model="zai-org/GLM-5.2",
    max_tokens=2048,
    messages=[{"role": "user", "content": "hi"}],
    metadata={"completion_window": "standard"},
)

# Header — set once on the client, or per request with extra_headers
client = Anthropic(
    auth_token="YOUR_VALAR_API_KEY",
    base_url="https://api.valarhq.ai",
    default_headers={"X-Valar-Completion-Window": "standard"},
)

pip install claude-agent-sdk

import asyncio
from claude_agent_sdk import ClaudeAgentOptions, query

async def main():
    options = ClaudeAgentOptions(
        model="zai-org/GLM-5.2",
        max_turns=5,
        allowed_tools=[],
        env={
            "ANTHROPIC_BASE_URL": "https://api.valarhq.ai",
            "ANTHROPIC_API_KEY": "YOUR_VALAR_API_KEY",
            "ANTHROPIC_CUSTOM_HEADERS": "X-Valar-Completion-Window: standard",
            # No effect until you attach MCP servers; see below.
            "ENABLE_TOOL_SEARCH": "true",
        },
    )

    async for message in query(prompt="Summarize what this repo does in two sentences.", options=options):
        for block in getattr(message, "content", []) or []:
            if getattr(block, "text", None):
                print(block.text, end="")

asyncio.run(main())