Claude Opus 4 Blog
![Short answer: there isn’t a “Claude Opus 4.8” model. The flagship model is Claude 3 Opus (model ID: claude-3-opus-20240229). Below is how to call it via the Anthropic Messages API.
Prerequisites
- Create an Anthropic account and API key: https://console.anthropic.com
- Keep the base URL and headers handy:
- URL: https://api.anthropic.com/v1/messages
- Headers:
- x-api-key: YOUR_API_KEY
- content-type: application/json
- anthropic-version: 2023-06-01
Quick start (cURL)
curl https://api.anthropic.com/v1/messages \
-H "x-api-key: $ANTHROPIC_API_KEY" \
-H "content-type: application/json" \
-H "anthropic-version: 2023-06-01" \
-d '{
"model": "claude-3-opus-20240229",
"max_tokens": 1024,
"messages": [
{"role": "user", "content": "Give me a 3-bullet summary of the benefits of serverless."}
]
}'
Node.js (official SDK)
import Anthropic from "@anthropic-ai/sdk";
const anthropic = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY });
const msg = await anthropic.messages.create({
model: "claude-3-opus-20240229",
max_tokens: 1024,
messages: [{ role: "user", content: "Write a haiku about the sea." }],
});
console.log(msg.content[0].text);
Python (official SDK)
from anthropic import Anthropic
import os
client = Anthropic(api_key=os.environ["ANTHROPIC_API_KEY"])
message = client.messages.create(
model="claude-3-opus-20240229",
max_tokens=1024,
messages=[{"role": "user", "content": "Draft a friendly welcome email in 3 sentences."}]
)
print(message.content[0].text)
Streaming (server-sent events via cURL)
curl -N https://api.anthropic.com/v1/messages \
-H "x-api-key: $ANTHROPIC_API_KEY" \
-H "content-type: application/json" \
-H "anthropic-version: 2023-06-01" \
-H "accept: text/event-stream" \
-d '{
"model": "claude-3-opus-20240229",
"max_tokens": 1024,
"stream": true,
"messages": [{"role":"user","content":"Explain transformers in 5 short points."}]
}'
Useful options
- system: Optional system prompt to set behavior.
- temperature: 0–1 (lower = more deterministic).
- top_p, top_k: Sampling controls (optional).
- max_tokens: Required upper bound for output length.
Common errors
- 401 Unauthorized: Check x-api-key and account status.
- 400 Bad Request: Verify JSON shape, model name, and required params (model, messages, max_tokens).
- 429 Rate limit: Back off and retry with exponential delay.
Notes
- If you’re using AWS Bedrock or Google Cloud Vertex AI, use their SDKs and provider-specific model IDs for Claude 3 Opus; headers/endpoints differ.
- For the exact, current model IDs and features, see Anthropic’s model list in the docs/console.
If you actually meant a different provider or a specific SDK (e.g., OpenRouter, Bedrock, Vertex), tell me which one and I’ll tailor the example.](/_next/image/?url=https%3A%2F%2Fresource.cometapi.com%2Fclaude-opus-4-8-benchmarks.webp&w=3840&q=75)
Short answer: there isn’t a “Claude Opus 4.8” model. The flagship model is Claude 3 Opus (model ID: claude-3-opus-20240229). Below is how to call it via the Anthropic Messages API. Prerequisites - Create an Anthropic account and API key: https://console.anthropic.com - Keep the base URL and headers handy: - URL: https://api.anthropic.com/v1/messages - Headers: - x-api-key: YOUR_API_KEY - content-type: application/json - anthropic-version: 2023-06-01 Quick start (cURL) curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "content-type: application/json" \ -H "anthropic-version: 2023-06-01" \ -d '{ "model": "claude-3-opus-20240229", "max_tokens": 1024, "messages": [ {"role": "user", "content": "Give me a 3-bullet summary of the benefits of serverless."} ] }' Node.js (official SDK) import Anthropic from "@anthropic-ai/sdk"; const anthropic = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY }); const msg = await anthropic.messages.create({ model: "claude-3-opus-20240229", max_tokens: 1024, messages: [{ role: "user", content: "Write a haiku about the sea." }], }); console.log(msg.content[0].text); Python (official SDK) from anthropic import Anthropic import os client = Anthropic(api_key=os.environ["ANTHROPIC_API_KEY"]) message = client.messages.create( model="claude-3-opus-20240229", max_tokens=1024, messages=[{"role": "user", "content": "Draft a friendly welcome email in 3 sentences."}] ) print(message.content[0].text) Streaming (server-sent events via cURL) curl -N https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "content-type: application/json" \ -H "anthropic-version: 2023-06-01" \ -H "accept: text/event-stream" \ -d '{ "model": "claude-3-opus-20240229", "max_tokens": 1024, "stream": true, "messages": [{"role":"user","content":"Explain transformers in 5 short points."}] }' Useful options - system: Optional system prompt to set behavior. - temperature: 0–1 (lower = more deterministic). - top_p, top_k: Sampling controls (optional). - max_tokens: Required upper bound for output length. Common errors - 401 Unauthorized: Check x-api-key and account status. - 400 Bad Request: Verify JSON shape, model name, and required params (model, messages, max_tokens). - 429 Rate limit: Back off and retry with exponential delay. Notes - If you’re using AWS Bedrock or Google Cloud Vertex AI, use their SDKs and provider-specific model IDs for Claude 3 Opus; headers/endpoints differ. - For the exact, current model IDs and features, see Anthropic’s model list in the docs/console. If you actually meant a different provider or a specific SDK (e.g., OpenRouter, Bedrock, Vertex), tell me which one and I’ll tailor the example.
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