Migrate from OpenRouter

1. Swap base_url and the API key#

PleumRouter is an OpenAI-compatible API, so you can keep using your existing SDK. First sign up, then issue a key under Dashboard → API Keys (keys start with plm_).

from openai import OpenAI

client = OpenAI(
    api_key="sk-or-v1-xxxxxxxx",                # OpenRouter key
    base_url="https://openrouter.ai/api/v1",    # OpenRouter
)

from openai import OpenAI

client = OpenAI(
    api_key="plm_xxxxxxxxxxxxxxxx",             # PleumRouter key
    base_url="https://apirouter.pleum.ai/v1",      # PleumRouter
)

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "plm_xxxxxxxxxxxxxxxx",
  baseURL: "https://apirouter.pleum.ai/v1",
});

2. Model IDs — send them as-is#

You can send vendor-namespaced formats like OpenRouter's openai/gpt-5.5 unchanged — we convert them automatically. The short form (gpt-5.5) works too. See the full model list at GET /v1/models or on the models page.

curl https://apirouter.pleum.ai/v1/chat/completions \
  -H "Authorization: Bearer plm_xxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.5",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

3. Streaming#

stream: true works with the OpenAI SDK as-is. The final chunk of the response includes usage along with the KRW cost (cost), so you know the price of each call right away.

stream = client.chat.completions.create(
    model="gpt-4.1",
    messages=[{"role": "user", "content": "Hello"}],
    stream=True,
)
for chunk in stream:
    print(chunk.choices[0].delta.content or "", end="")

4. Error handling#

Status codes match the OpenAI standard (400/401/402/429/502). If credits run low, you get a 402 with a top-up prompt. For the full format, see the error docs.

5. Cost — how is it different from OpenRouter?#

OpenRouter charges roughly a 5.5% fee on credit purchases. PleumRouter doesn't mark up token prices (0%) and only a 3% platform fee at top-up — cheaper. On top of that, KRW payments are built in, making corporate-card reconciliation far easier. See the full formula in the pricing docs.