Claude Opus 4.8 API: pricing, integration and limits

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Published: Oct 24, 2026, 6:11 AM UTC · Updated: Oct 24, 2026, 5:18 PM UTC

Exact ID: claude-opus-4-8. Models available to your key: GET /v1/models.

Claude Opus 4.8 API pricing

Cost calculator for Claude Opus 4.8

Context and capabilities of Claude Opus 4.8

The manufacturer specifies a shared context window of 1,000,000 and a maximum output of 128,000 tokens for its own API (specification: Anthropic, checked Oct 24, 2026, 6:11 AM UTC). These are manufacturer limits, not verified effective API429 limits: test very long contexts on your own request.

API429 capabilities published for this exact ID: chat vision . Test any mode missing from this list on your own request.

Speed and errors of Claude Opus 4.8 over 24 hours

There are no fresh observations with confirmed traffic for this model. This does not mean zero latency or prove an absence of errors.

Source: public 24-hour statistics. The mean is neither a median nor a response time guarantee.

How to connect Claude Opus 4.8: curl, Python, JavaScript

Create a key, check your balance and set API429_API_KEY on the server. The request is paid from your balance; Python and JavaScript first check that the model is available to your key.

curl

Before generation, check the exact ID in the response from GET https://gateway.api429.com/v1/models using the same Bearer key.

curl --fail-with-body https://gateway.api429.com/v1/chat/completions \
  -H "Authorization: Bearer $API429_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-opus-4-8","messages":[{"role":"user","content":"Bug: pagination repeats the last item from the previous page. Rows are sorted by created_at and timestamps may tie. Propose hypotheses and a verification plan without running queries."}],"max_tokens":512,"stream":false}'

Python 3

import json
import os
import urllib.request

key = os.environ["API429_API_KEY"]
base = "https://gateway.api429.com/v1"
headers = {"Authorization": "Bearer " + key, "Content-Type": "application/json"}
models_request = urllib.request.Request(base + "/models", headers=headers)
with urllib.request.urlopen(models_request, timeout=30) as response:
    available = {item["id"] for item in json.load(response)["data"]}
model = "claude-opus-4-8"
if model not in available:
    raise ValueError("Model is unavailable to this key")
payload = json.loads("{\"model\":\"claude-opus-4-8\",\"messages\":[{\"role\":\"user\",\"content\":\"Bug: pagination repeats the last item from the previous page. Rows are sorted by created_at and timestamps may tie. Propose hypotheses and a verification plan without running queries.\"}],\"max_tokens\":512,\"stream\":false}")
request = urllib.request.Request(base + "/chat/completions",
    data=json.dumps(payload).encode("utf-8"), headers=headers, method="POST")
with urllib.request.urlopen(request, timeout=60) as response:
    result = json.load(response)
choice = result["choices"][0]
if choice.get("finish_reason") != "stop" or not choice.get("message", {}).get("content"):
    raise ValueError("Incomplete or empty response")
print(choice["message"]["content"])
print(result.get("usage"))

JavaScript: Node.js 18+

const key = process.env.API429_API_KEY;
if (!key) throw new Error("Set API429_API_KEY");
const base = "https://gateway.api429.com/v1";
const headers = { Authorization: "Bearer " + key, "Content-Type": "application/json" };
const model = "claude-opus-4-8";
const available = await fetch(base + "/models", { headers, signal: AbortSignal.timeout(30000) });
if (!available.ok) throw new Error("Models HTTP " + available.status);
if (!(await available.json()).data.some(item => item.id === model)) throw new Error("Model unavailable to this key");
const response = await fetch(base + "/chat/completions", {
  method: "POST", headers, signal: AbortSignal.timeout(60000),
  body: JSON.stringify({"model":"claude-opus-4-8","messages":[{"role":"user","content":"Bug: pagination repeats the last item from the previous page. Rows are sorted by created_at and timestamps may tie. Propose hypotheses and a verification plan without running queries."}],"max_tokens":512,"stream":false})
});
if (!response.ok) throw new Error("Generation HTTP " + response.status);
const result = await response.json();
const choice = result.choices?.[0];
if (choice?.finish_reason !== "stop" || !choice?.message?.content) throw new Error("Incomplete or empty response");
console.log(choice.message.content);
console.log(result.usage);

The examples use basic fields from the published API contract.

Claude Opus 4.8 in n8n: HTTP Request

1. Create an HTTP Request with method POST and URL https://gateway.api429.com/v1/chat/completions.
2. Store the Bearer key in credentials; add Content-Type: application/json. Do not put the key in an exported workflow example.
3. Send the JSON from curl: the exact model claude-opus-4-8, messages, max_tokens and stream=false.
4. After the HTTP node, check choices, finish_reason and the response content before writing the result to your production system.

HTTP Request documentation.

Alternatives to Claude Opus 4.8: similar models and prices

Compare them on the same task. Prices apply to a short text request; see the catalog for full pricing.

Version and release date

Manufacturer API release date, Anthropic: May 28, 2026. The exact predecessor has not been established in the reviewed sources.

Frequently asked questions

Sources and review

• platform.claude.com/docs/en/models/opus-4-8/overview
• platform.claude.com/docs/en/about-claude/pricing
• platform.claude.com/docs/en/about-claude/model-deprecations
• gateway.api429.com/api/public/openapi.json

Editorial review: Oct 24, 2026, 6:11 AM UTC. Pricing and general calculator · Getting started · Compare the family: Claude