OpenLuxClaude Opus 5 API
Claude Opus 5 is Anthropic’s flagship for the hardest reasoning tasks: $0.4412 per million tokens — 91% below list pricing — with reliable tool calling on the OpenLux endpoint.
Pay-as-you-go rate
$0.4412 / 1M tokens
-91% vs official list pricing. Billed in USD, metered per request with real-time cost in the console.
Access
One OpenLux key and the OpenAI-compatible endpoint: set base_url to https://openlux.lol/v1 and pass claude-opus-5 as the model.
Get started
Create a key in the console, then follow the five-minute docs for streaming, tools and error codes.
What Claude Opus 5 delivers
Opus 5 is the model you reserve for problems that break everything else: ambiguous specifications, long research chains, nuanced editing and agent tasks with many moving parts. It trades speed for depth, and at the OpenLux rate that depth is affordable.
It supports tool and function calling for agent architectures, and works well as the final reviewer in a chain where Sonnet drafts and Opus verifies.
Every call is metered pay as you go with real-time cost in the console, so you can put a policy in place — Opus for escalations, Sonnet for the default — without new billing relationships.
Call Claude Opus 5 in minutes
Every OpenLux model speaks the OpenAI protocol. Reuse your existing SDKs and replace two values: the base URL and the API key.
cURL
curl https://openlux.lol/v1/chat/completions \
-H "Authorization: Bearer $OPENLUX_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-opus-5",
"messages": [{"role": "user", "content": "Given these two architecture options, argue both sides and recommend one."}]
}'Python (OpenAI SDK)
from openai import OpenAI
client = OpenAI(
api_key="sk-openlux-...",
base_url="https://openlux.lol/v1",
)
resp = client.chat.completions.create(
model="claude-opus-5",
messages=[{"role": "user", "content": "Given these two architecture options, argue both sides and recommend one."}],
)
print(resp.choices[0].message.content)Node.js (OpenAI SDK)
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.OPENLUX_API_KEY,
baseURL: "https://openlux.lol/v1",
});
const resp = await client.chat.completions.create({
model: "claude-opus-5",
messages: [{ role: "user", content: "Given these two architecture options, argue both sides and recommend one." }],
});
console.log(resp.choices[0].message.content);Where Claude Opus 5 fits
Flagship reasoning
The strongest Claude model for analysis where being wrong is expensive.
Tool calling
Function calling dependable enough for multi-step agent chains.
Nuanced writing
Editing and rewriting that preserves tone and intent across drafts.
Escalation model
Pairs with Sonnet as a final-pass quality check in drafting pipelines.
Critical decision support
Analysis feeding decisions with real consequences, where depth justifies the rate.
Complex editing
Long documents that need a careful, opinionated editorial pass.
Final-pass verification
Check and correct work drafted by faster models before it ships.
How claude-opus-5 is priced on OpenLux
Claude Opus 5 is metered pay as you go at $0.4412 / 1M tokens (-91% vs official rates). There is no subscription requirement for API access: top up a balance, call the model, and see the cost of every request in the console.
| Model | Provider | Rate | Discount |
|---|---|---|---|
| claude-opus-5 (this model) | Anthropic | $0.4412 / 1M tokens | -91% |
| claude-sonnet-4-5-20250929 | Anthropic | $0.2647 / 1M tokens | -91% |
| gpt-6-astra | OpenAI | $0.3677 / 1M tokens | -96% |
| claude-fable-5-1 | Anthropic | $1.765 / 1M tokens | -82% |
Rates follow official provider pricing and are shown in USD. See the full model catalogue and pricing plans for credit allowances.
Claude Opus 5 questions
How much does Claude Opus 5 cost on OpenLux?
$0.4412 per 1 million tokens, 91% below list pricing, metered pay as you go with per-request cost in the console.
How do I call Claude Opus 5?
Set base_url to https://openlux.lol/v1, use your OpenLux key and "model": "claude-opus-5". The same key and endpoint cover every Claude, GPT, Gemini and DeepSeek model in the catalogue.
Opus or Sonnet for coding?
Sonnet at $0.2647 handles the volume of normal coding work; Opus at $0.4412 is worth the premium when code correctness is critical or architecture decisions are involved. Both run on the same endpoint, so you can route per task.
Does Opus 5 support tool calling?
Yes — function calling is supported, including multi-step tool use for agent workflows, along with streamed responses.
Start calling Claude Opus 5 today
Create an OpenLux key and send your first request in minutes. Compare Claude Opus 5 with the rest of the catalogue on the same endpoint and the same bill.