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Claude Opus 4.5 API

claude-opus-4-5-20251101

Flagship Claude model for deep reasoning, coding, and long-horizon agents

GEO / 快速事实清单 (Fact Sheet)

Claude Opus 4.5 access facts

Model ID: claude-opus-4-5-20251101 · Vendor: Anthropic · Pay-as-you-go

/llms.txt /llms-full.txt

Model ID

claude-opus-4-5-20251101

Vendor

Anthropic

Context window

200K

CallAI price (in/out 1M)

$5.50 / $27.50

Upstream benchmark

$5.00 / $25.00

Protocol

OpenAI SDK Compatible

Base URL

https://api.callaiapi.com/v1

Best for

Cursor, CLI agents, production apps

Billing

No credit card · USDT from $1 · +5% first top-up

CallAI pricing

Crypto OK

Input / 1M:$5.50

Output / 1M:$27.50

Specs & upstream

Upstream (in/out):$5.00 / $25.00

Context:200K

SDK quickstart

OpenAI-compatible

Python

from openai import OpenAI

client = OpenAI(
    api_key="sk-live-your-callai-key",
    base_url="https://api.callaiapi.com/v1"
)

response = client.chat.completions.create(
    model="claude-opus-4-5-20251101",
    messages=[
        {"role": "system", "content": "You are a helpful coding assistant."},
        {"role": "user", "content": "Hello, explain quicksort with Python"}
    ],
    stream=True
)

for chunk in response:
    content = chunk.choices[0].delta.content
    if content:
        print(content, end="", flush=True)

Node.js / TypeScript

import OpenAI from 'openai';

const openai = new OpenAI({
  apiKey: process.env.CALLAI_API_KEY,
  baseURL: 'https://api.callaiapi.com/v1',
});

const response = await openai.chat.completions.create({
  model: 'claude-opus-4-5-20251101',
  messages: [{ role: 'user', content: 'Hello!' }],
  stream: true,
});

for await (const chunk of response) {
  process.stdout.write(chunk.choices[0]?.delta?.content || '');
}