# Migrating from the Anthropic API

> Move an existing Anthropic-SDK codebase over by changing two values.

_Source: https://aiprimetech.io/docs/guides/migration-from-anthropic/ · Home > Docs > Working with the API_

Because the gateway speaks the Messages format, migration is a configuration change. Request bodies, response parsing, streaming handlers and tool definitions all stay as they are.


## Python

```python
from anthropic import Anthropic

client = Anthropic(
    api_key="sk-your-gateway-key",   # was your Anthropic key
    base_url="https://aiprimetech.io",                   # new line
)
# everything below is unchanged
```


## TypeScript

```typescript
import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  apiKey: process.env.CLAUDEAPIKEY,
  baseURL: "https://aiprimetech.io",
});
```


## Environment-only migration

```bash
export ANTHROPIC_BASE_URL="https://aiprimetech.io"
export ANTHROPIC_API_KEY="sk-your-gateway-key"
```


## Migration checklist

1. Change the base URL and the key. No `/v1` suffix for Anthropic clients.
2. Map model ids — see [Models](/docs/getting-started/models/). Ids are pinned, so `claude-3-5-sonnet-20241022` style names from an older integration need updating to a current id.
3. Re-run your test suite. Response shapes are identical, so anything that breaks is a model-id or base-URL issue.
4. Check streaming if you use it: the event shape is unchanged, but any hardcoded hostname in a proxy or allowlist needs updating.
5. Move one service first and compare outputs before switching everything.


## What does not carry over

- Anthropic Console features — workbench, org billing, per-workspace limits — are Anthropic products and have no equivalent here.
- Batch API and any beta feature not exposed by this gateway. Check [Overview](/docs/api-reference/overview/) for the current endpoint list.
- Contractual terms. If you need a DPA or SLA signed by Anthropic, stay on the official API.

- [Base URLs](https://aiprimetech.io/docs/getting-started/base-urls/) — The suffix rule
- [Models](https://aiprimetech.io/docs/getting-started/models/) — Id mapping
- [Python SDK](https://aiprimetech.io/docs/sdks/python/) — Full example


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_ClaudeAPIKey.dev is an independently operated, Anthropic-compatible API gateway. Not affiliated with Anthropic._