Claude 4.6 全系列价格与 API 接入完整指南（2026年3月最新）

pip install anthropic
export ANTHROPIC_API_KEY="sk-ant-xxxxx"

import anthropic

client = anthropic.Anthropic()
message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "帮我写一个快速排序算法"}]
)
print(message.content[0].text)

npm install @anthropic-ai/sdk

import Anthropic from '@anthropic-ai/sdk'

const client = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY })
const message = await client.messages.create({
  model: 'claude-sonnet-4-6',
  max_tokens: 1024,
  messages: [{ role: 'user', content: '你好，Claude！' }]
})
console.log(message.content[0].text)

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    system=[{
        "type": "text",
        "text": "你是一个代码审查专家..." + very_long_guideline,
        "cache_control": {"type": "ephemeral"}  # 标记缓存
    }],
    messages=[{"role": "user", "content": "审查这段代码：..."}]
)
# 首次：正常费用（$3/百万 Token）
# 后续相同 system：缓存读取（$0.30/百万 Token，降低 90%）

def get_model(task: str) -> str:
    return {
        "complex_reasoning": "claude-opus-4-6",   # $5/$25
        "coding":            "claude-sonnet-4-6",  # $3/$15
        "chat":              "claude-sonnet-4-6",
        "classification":    "claude-haiku-4-5",   # $0.8/$4
        "extraction":        "claude-haiku-4-5",
        "translation":       "claude-haiku-4-5",
    }.get(task, "claude-sonnet-4-6")

batch = client.beta.messages.batches.create(requests=[
    {
        "custom_id": f"task-{i}",
        "params": {
            "model": "claude-sonnet-4-6",
            "max_tokens": 512,
            "messages": [{"role": "user", "content": prompt}]
        }
    }
    for i, prompt in enumerate(prompts)
])
# 批量价格 = 正常 50% = Sonnet $1.5/$7.5 每百万 Token

response = client.messages.create(
    model="claude-opus-4-6",
    effort="medium",   # high（默认）/ medium / low
    messages=[...]
)
# effort=low：速度更快，成本更低，适合简单任务
# effort=high：深度推理，适合复杂 Agent 任务