Switch from another provider

When to use this pageCopy Anchor Link

Your code or tool already calls Anthropic's API, or an OpenAI-compatible router such as OpenRouter, and you want it to call EZAT Router instead. In most cases you change the base URL and the key, and check the model names.

From Anthropic's APICopy Anchor Link

EZAT speaks Anthropic's Messages format, and Anthropic's model names are aliases of EZAT's ids, so code written for Anthropic's API works unchanged.

The quickest switch needs no code change. The Anthropic SDKs read ANTHROPIC_BASE_URL and ANTHROPIC_API_KEY:

export ANTHROPIC_BASE_URL="https://api.router.ezat.io"
export ANTHROPIC_API_KEY="$EZAT_API_KEY"

Or pass both to the client. Before:

client = anthropic.Anthropic(api_key=os.environ["ANTHROPIC_API_KEY"])

After:

import os

import anthropic

client = anthropic.Anthropic(
    base_url="https://api.router.ezat.io",
    api_key=os.environ["EZAT_API_KEY"],
)

message = client.messages.create(
    model="anthropic/claude-sonnet-5-5",
    max_tokens=64,
    messages=[{"role": "user", "content": "Say hello in five words."}],
)
print("".join(block.text for block in message.content if block.type == "text"))

For Claude Code, see Claude Code: it uses ANTHROPIC_AUTH_TOKEN instead of ANTHROPIC_API_KEY.

What isn't the same as Anthropic's own API:

• Not available: the Message Batches API, the Files API, server tools (web search, code execution) and the MCP connector. Images must be sent as base64, not by URL.
• anthropic-beta is passed to the model provider, which may not accept every beta Anthropic's API does.
• Non-streaming requests end after 590 seconds with 504 timeout_error. Stream long requests.
• Limits are per EZAT key (Rate limits). EZAT doesn't send anthropic-ratelimit-* headers.
• Prompt caches start empty. Your first requests write the cache again.

The full list is in Anthropic Messages API.

From OpenRouter and other OpenAI-compatible routersCopy Anchor Link

Use EZAT's OpenAI-compatible API. Change the base URL and the key, and check each model id.

Before:

client = OpenAI(
    base_url="https://openrouter.ai/api/v1",
    api_key=os.environ["OPENROUTER_API_KEY"],
)

After:

import os

from openai import OpenAI

client = OpenAI(
    base_url="https://api.router.ezat.io/openai/v1",
    api_key=os.environ["EZAT_API_KEY"],
)

completion = client.chat.completions.create(
    model="anthropic/claude-sonnet-5-5",
    max_tokens=64,
    messages=[{"role": "user", "content": "Say hello in five words."}],
)
print(completion.choices[0].message.content)

Tools that read OPENAI_BASE_URL and OPENAI_API_KEY need only those two changed. For editors and frameworks, see OpenAI-format tools.

What isn't the same:

• Only Chat Completions and the models endpoints. No Responses API, embeddings, image generation or audio.
• Refused fields: n above 1, logprobs, logit_bias, audio, web_search_options, the legacy functions API and response_format json_object return 400. The list is in Chat Completions.
• temperature and top_p reach only the models that accept them; elsewhere they are dropped.
• An overloaded model is 503, and an empty balance is 402 insufficient_quota.

What to check after switchingCopy Anchor Link

First, list the models your key can use, and make sure every model id in your code is in the list or is an alias on Models:

curl --fail-with-body https://api.router.ezat.io/v1/models -H "x-api-key: $EZAT_API_KEY"

Then:

1. Search your code for features EZAT doesn't have: batches, file uploads, server tools, the MCP connector, the Responses API, embeddings.
2. Send a real request from your app and find it on the dashboard's Usage page, with its tokens and cost.
3. Check the balance. EZAT is prepaid: when the balance is used up, requests fail with 402 until you add credits (Billing). A spend limit per key is on API keys.
4. Watch cache reads on long prompts after the first few requests (Prompt caching and sessions).

For AI agentsCopy Anchor Link

1. From Anthropic's API: set base URL https://api.router.ezat.io and the EZAT key from EZAT_API_KEY. Keep Anthropic model names; they are aliases.
2. From OpenRouter or another OpenAI-compatible router: set base URL https://api.router.ezat.io/openai/v1 and the EZAT key. Rewrite dotted model ids (anthropic/claude-sonnet-5.5 becomes anthropic/claude-sonnet-5-5), and check every id against GET https://api.router.ezat.io/openai/v1/models.
3. Remove or replace calls to features EZAT doesn't have (batches, files, server tools, MCP connector, Responses API, embeddings, audio, image generation).
4. Don't keep the old provider's key in the new configuration, and don't print the EZAT key.
5. Make one request, and confirm it on the dashboard's Usage page.