claude opus 4.8 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: $ANTHROPIC_API_KEY" \ -H "content-type: application/json" \ -H "anthropic-version: 2023-06-01" \ -H "accept: text/event-stream" \ -d '{ "model": "claude-3-opus-20240229", "max_tokens": 1024, "stream": true, "messages": [{"role":"user","content":"Explain transformers in 5 short points."}] }' Useful options - system: Optional system prompt to set behavior. - temperature: 0–1 (lower = more deterministic). - top_p, top_k: Sampling controls (optional). - max_tokens: Required upper bound for output length. Common errors - 401 Unauthorized: Check x-api-key and account status. - 400 Bad Request: Verify JSON shape, model name, and required params (model, messages, max_tokens). - 429 Rate limit: Back off and retry with exponential delay. Notes - If you’re using AWS Bedrock or Google Cloud Vertex AI, use their SDKs and provider-specific model IDs for Claude 3 Opus; headers/endpoints differ. - For the exact, current model IDs and features, see Anthropic’s model list in the docs/console. If you actually meant a different provider or a specific SDK (e.g., OpenRouter, Bedrock, Vertex), tell me which one and I’ll tailor the example.$

Jun 29, 2026

claude opus 4.8

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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Claude Opus 4.8 forklaret: Benchmarks, nye funktioner & sammenligning