Claude Opus 5.5 API

US Anthropic | リリース 2026-10

Claude Opus 5.5 is the Anthropic flagship, built for high-difficulty reasoning, serious code development and long-horizon agent tasks. It extends the Opus line’s strengths in sustained autonomy and nuanced instruction following, available through MeshTok with a million-token context window.

推論コードツールフラッグシップcap.vision

料金 (公式、1Mトークンあたり)

入力

$4.00/M

出力

$20.00/M

仕様

コンテキストウィンドウ1000K トークン入力モダリティテキストストリーミングはい APIOpenAI互換

Claude Opus 5.5の使い方

OpenAIの直接代替。base_urlとモデルのみ変更。

# Python - pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://meshtok.com/v1",
    api_key="sk-your-MeshTok-key",
)

resp = client.chat.completions.create(
    model="anthropic/claude-opus-5.5",
    messages=[{"role":"user","content":"Hello!"}],
)
print(resp.choices[0].message.content)

# cURL
curl https://meshtok.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-MeshTok-key" \
  -H "Content-Type: application/json" \
  -d '{"model":"anthropic/claude-opus-5.5","messages":[{"role":"user","content":"Hello!"}]}'