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Anthropic SDK

Anthropic's official client libraries for the Messages API.

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Set up Anthropic SDK

The examples use MoonshotAI: Kimi K3, a live model on llm.buzz. Any model name from the Models page works.

  1. Create a key in the llm.buzz console under Keys, and keep it in the LLM_BUZZ_KEY environment variable.

  2. Pass the base URL without /v1, since the SDK adds /v1/messages itself.

    Python
    import os
from anthropic import Anthropic
 
client = Anthropic(base_url="https://api.llm.buzz/api", api_key=os.environ["LLM_BUZZ_KEY"])
message = client.messages.create(
    model="moonshotai/kimi-k3",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)
print(message.content[0].text)

  3. To name your app, send X-Title and HTTP-Referer with every request, as OpenRouter apps do.

    Python
    client = Anthropic(
    base_url="https://api.llm.buzz/api",
    api_key=os.environ["LLM_BUZZ_KEY"],
    default_headers={"X-Title": "Your app", "HTTP-Referer": "https://your-app.example"},
)

Usage on llm.buzz

Weekly tokens from requests that name this app.

Rankings
Tokens last week
–
Rank last week
–
among apps on llm.buzz
vs prior week
–
Tokens, 12 weeks
–

Tokens by week

Usage is published weekly, once at least 5 organizations use a model. The current week closes Monday, Nov 2, 2026, 00:00 UTC.

Top models

No model's usage is published for Anthropic SDK yet.

A model or app appears only when at least 5 organizations used it that week and no single one sent more than 80% of its tokens.

Popular models for coding agents

Live models that call tools, the most used and most widely served first.

All tool-calling models
1M context10% off
MoonshotAI: Kimi K3by MoonshotAI

Kimi K3 is a 2.8T parameter open-weight multimodal reasoning model from Moonshot AI.

Providers
6
Input
$2.85 $2.565/M
Output
$14.25 $12.825/M
Context
1M
→
1M context
Z.ai: GLM 5.3by Z.ai

GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks.

Providers
5
Input
$0.98/M
Output
$3.08/M
Context
1M
→
1M context25% off
Qwen: Qwen3.8 Flashby Qwen

Qwen3.8 Flash is a multimodal reasoning model from Alibaba.

Providers
4
Input
$0.15 $0.1125/M
Output
$0.47 $0.3525/M
Context
1M
→
256K context
Qwen: Qwen3.8 27Bby Qwen

Qwen3.8 27B is an open-weight dense vision-language model from Qwen.

Providers
4
Input
$0.20/M
Output
$2.50/M
Context
256K
→
1M context
Z.ai: GLM 5.3 Flashby Z.ai

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks.

Providers
4
Input
$0.15/M
Output
$0.50/M
Context
1M
→
128K context
OpenAI: gpt-oss-120bby OpenAI

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and…

Providers
3
Input
$0.05/M
Output
$0.25/M
Context
128K
→

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Point Anthropic SDK at llm.buzzOne key for every model here; each request pays the price of the provider that answered it.
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