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openai-sdk changedcli-sdks-libraries/libraries/openai-sdk

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11---
22title: OpenAI SDK compatibility
33url: https://platform.claude.com/docs/en/cli-sdks-libraries/libraries/openai-sdk
4description: Anthropic provides a compatibility layer that lets you use the OpenAI SDK to test the Claude API. With a few code changes, you can quickly evaluate Anthropic model capabilities.
4description: Anthropic provides a compatibility layer that lets you use the OpenAI SDK to test the Claude API. With a few code changes, you can evaluate Anthropic model capabilities.
55---
66 
77<Note>
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2222 
23231. Use an official OpenAI SDK.
2424 
252. Change the following
252. Change the following:
2626 
27 * Update your base URL to point to the Claude API
28 * Replace your API key with a [Claude API key](https://platform.claude.com/settings/keys) from the Claude Console
29 * If your key is a [personal or service account key](https://platform.claude.com/docs/en/manage-claude/authentication#key-types) that isn't scoped to a workspace, also send the `anthropic-workspace-id` header on every request (for example, `default_headers` in the Python SDK or `defaultHeaders` in TypeScript); see [Select a workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace)
30 * Update your model name to use a [Claude model](https://platform.claude.com/docs/en/models/overview)
27 * Update your base URL to point to the Claude API.
28 * Replace your API key with a [Claude API key](https://platform.claude.com/settings/keys) from the Claude Console.
29 * If your key is a [personal or service account key](https://platform.claude.com/docs/en/manage-claude/authentication#key-types) that isn't scoped to a workspace, also send the `anthropic-workspace-id` header on every request (for example, `default_headers` in the Python SDK or `defaultHeaders` in TypeScript); see [Select a workspace](https://platform.claude.com/docs/en/manage-claude/authentication#select-a-workspace).
30 * Update your model name to use a [Claude model](https://platform.claude.com/docs/en/models/overview).
3131 
32323. Review the following sections for what features are supported.
3333 
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183183 
184184Here are the most substantial differences from using OpenAI:
185185 
186* The `strict` parameter for function calling is ignored, which means the tool use JSON is not guaranteed to follow the supplied schema. For guaranteed schema conformance, use the native [Claude API with Structured Outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs).
186* The `strict` parameter for function calling is ignored, which means the tool use JSON is not guaranteed to follow the supplied schema. For guaranteed schema conformance, use the native [Claude API with structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs).
187187* Audio input is not supported; it is ignored and stripped from input.
188188* Prompt caching is not supported, but it is supported in the [Anthropic SDKs](https://platform.claude.com/docs/en/cli-sdks-libraries/overview).
189189* System/developer messages are hoisted and concatenated into the top-level `system` field, wherever they appear in the conversation. To add system instructions partway through a conversation, use [mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages) in the native Claude API.
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297297| `n` | Must be exactly 1 |
298298| `logprobs` | Ignored |
299299| `metadata` | Ignored |
300| `response_format` | Ignored. For JSON output, use [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) with the native Claude API |
300| `response_format` | Ignored. For JSON output, use [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) with the native Claude API. |
301301| `prediction` | Ignored |
302302| `presence_penalty` | Ignored |
303303| `frequency_penalty` | Ignored |
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318318 <Tab title="Tools">
319319 `tools[n].function` fields
320320 
321 | Field | Support status |
322 | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
323 | `name` | Fully supported |
324 | `description` | Fully supported |
325 | `parameters` | Fully supported |
326 | `strict` | Ignored. Use [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) with the native Claude API for strict schema validation |
321 | Field | Support status |
322 | ------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
323 | `name` | Fully supported |
324 | `description` | Fully supported |
325 | `parameters` | Fully supported |
326 | `strict` | Ignored. Use [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) with the native Claude API for strict schema validation. |
327327 </Tab>
328328 
329329 <Tab title="Functions">
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333333 OpenAI has deprecated the `functions` field and recommends using `tools` instead.
334334 </Info>
335335 
336 | Field | Support status |
337 | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
338 | `name` | Fully supported |
339 | `description` | Fully supported |
340 | `parameters` | Fully supported |
341 | `strict` | Ignored. Use [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) with the native Claude API for strict schema validation |
336 | Field | Support status |
337 | ------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
338 | `name` | Fully supported |
339 | `description` | Fully supported |
340 | `parameters` | Fully supported |
341 | `strict` | Ignored. Use [structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) with the native Claude API for strict schema validation. |
342342 </Tab>
343343 </Tabs>
344344</Accordion>
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