feat(responses): Add OpenAI Responses API endpoint implementation

Documentation/Classes/OpenAI.md

@@ -59,6 +59,7 @@ The API provides access to multiple resources that allow seamless interaction wi
 |-------------------|-------------------------------------------------|--------------------------------|
 | `models`          | [OpenAIModelsAPI](OpenAIModelsAPI.md)           | Access to the Models API.      |
 | `chat`            | [OpenAIChatAPI](OpenAIChatAPI.md)               | Access to the Chat API.        |
+| `responses`       | [OpenAIResponsesAPI](OpenAIResponsesAPI.md)     | Access to the Responses API.   |
 | `images`          | [OpenAIImagesAPI](OpenAIImagesAPI.md)           | Access to the Images API.      |
 | `moderations`     | [OpenAIModerationsAPI](OpenAIModerationsAPI.md) | Access to the Moderations API. |
 | `embeddings`      | [OpenAIEmbeddingsAPI](OpenAIEmbeddingsAPI.md)   | Access to the Embeddings API.  |

Documentation/Classes/OpenAIFilesAPI.md

@@ -45,6 +45,7 @@ Upload a file that can be used across various endpoints.
 - **Batch API:** Only supports `.jsonl` files up to 200 MB with specific required format
 - **Assistants API:** Supports specific file types (see Assistants Tools guide)
 - **Chat Completions API:** PDFs are only supported
+- **Responses API:** Uploaded files can also be referenced from Responses API inputs, depending on the input type supported by the target model
 
 #### Example
 

Documentation/Classes/OpenAIParameters.md

@@ -52,3 +52,13 @@ Several classes inherit from `OpenAIParameters` to extend its functionality for
 - [OpenAIChatCompletionsMessagesParameters](OpenAIChatCompletionsMessagesParameters.md)
 - [OpenAIImageParameters](OpenAIImageParameters.md)
 - [OpenAIEmbeddingsParameters](OpenAIEmbeddingsParameters.md)
+- [OpenAIResponsesParameters](OpenAIResponsesParameters.md)
+- [OpenAIResponsesCompactParameters](OpenAIResponsesCompactParameters.md)
+- [OpenAIResponsesInputItemsParameters](OpenAIResponsesInputItemsParameters.md)
+
+## See also
+
+- [OpenAIChatCompletionsParameters](OpenAIChatCompletionsParameters.md)
+- [OpenAIResponsesParameters](OpenAIResponsesParameters.md)
+- [OpenAIResponsesCompactParameters](OpenAIResponsesCompactParameters.md)
+- [OpenAIResponsesInputItemsParameters](OpenAIResponsesInputItemsParameters.md)

Documentation/Classes/OpenAIResponse.md

@@ -0,0 +1,209 @@
+# OpenAIResponse
+
+The `OpenAIResponse` class represents a response object from the OpenAI Responses API.
+
+## Properties
+
+### id
+**Type**: Text
+
+The unique identifier for the response.
+
+### object
+**Type**: Text
+
+The object type (typically "response").
+
+### model
+**Type**: Text
+
+The model that generated the response.
+
+### created_at
+**Type**: Integer
+
+Unix timestamp of when the response was created.
+
+### output
+**Type**: Variant
+
+The output content generated by the model. In the Responses API this is typically a collection of output items (messages, tool calls, etc.).
+
+### status
+**Type**: Text
+
+The current status of the response. Possible values:
+- "completed" or "done": Response generation is complete
+- "processing" or "in_progress": Response is still being generated
+- "failed" or "error": Response generation failed
+
+### usage
+**Type**: Object
+
+Token usage information for the response. Typically includes:
+- `input_tokens`: Number of input tokens
+- `output_tokens`: Number of generated output tokens
+- `total_tokens`: Total tokens used
+
+### metadata
+**Type**: Object
+
+Custom metadata associated with the response.
+
+### conversation
+**Type**: Variant
+
+The conversation reference returned by the Responses API, if applicable.
+
+## Functions
+
+### outputText
+
+**get outputText** : Text
+
+| Property        | Type    | Description                               |
+|-----------------|---------|-------------------------------------------|
+| Function result | Text    | The text output or empty string if not available |
+
+Returns the text output from the response by extracting `output_text` items from the output structure.
+
+#### Example Usage
+
+```4d
+var $response:=$result.response
+var $text:=$response.outputText
+ALERT($text)
+```
+
+### isComplete
+
+**get isComplete** : Boolean
+
+| Property        | Type    | Description                               |
+|-----------------|---------|-------------------------------------------|
+| Function result | Boolean | True if the response is complete          |
+
+Checks if the response generation is complete.
+
+#### Example Usage
+
+```4d
+var $response:=$result.response
+If ($response.isComplete)
+    ALERT($response.outputText)
+End if
+```
+
+### isFailed
+
+**get isFailed** : Boolean
+
+| Property        | Type    | Description                               |
+|-----------------|---------|-------------------------------------------|
+| Function result | Boolean | True if the response generation failed    |
+
+Checks if the response generation failed.
+
+#### Example Usage
+
+```4d
+var $response:=$result.response
+If ($response.isFailed)
+    ALERT("Response generation failed")
+End if
+```
+
+### isProcessing
+
+**get isProcessing** : Boolean
+
+| Property        | Type    | Description                               |
+|-----------------|---------|-------------------------------------------|
+| Function result | Boolean | True if the response is still processing  |
+
+Checks if the response is still being generated.
+
+#### Example Usage
+
+```4d
+var $response:=$result.response
+If ($response.isProcessing)
+    // Poll again later or wait for completion
+End if
+```
+
+## Example Usage
+
+### Basic Usage
+
+```4d
+var $result:=$client.responses.create("Hello"; {model: "gpt-5"})
+var $response:=$result.response
+
+ALERT($response.outputText)
+// $response.id contains the response identifier
+// $response.model contains the model ID
+// $response.status contains the current status
+```
+
+### Checking Response Status
+
+```4d
+var $response:=$result.response
+
+Case of
+    : ($response.isComplete)
+        ALERT($response.outputText)
+    : ($response.isProcessing)
+        // Poll again later or wait for completion
+    : ($response.isFailed)
+        ALERT("Failed")
+End case
+```
+
+### Accessing Usage Information
+
+```4d
+var $response:=$result.response
+
+If ($response.usage#Null)
+    ALERT("Input tokens: "+String($response.usage.input_tokens))
+    ALERT("Output tokens: "+String($response.usage.output_tokens))
+    ALERT("Total tokens: "+String($response.usage.total_tokens))
+End if
+```
+
+### Working with Metadata
+
+```4d
+var $response:=$result.response
+
+If ($response.metadata#Null)
+    ALERT("User ID: "+$response.metadata.user_id)
+    ALERT("Session: "+$response.metadata.session)
+End if
+```
+
+### Multi-turn Conversations
+
+```4d
+// First turn
+var $result1:=$client.responses.create("What is AI?"; {model: "gpt-5"; conversation: "conv_123"})
+var $response1:=$result1.response
+ALERT($response1.outputText)
+
+// Second turn - reuse the returned conversation reference
+var $params:=cs.AIKit.OpenAIResponsesParameters.new()
+$params.model:="gpt-5"
+$params.conversation:=$response1.conversation
+$params.previous_response_id:=$response1.id
+
+var $result2:=$client.responses.create("Tell me more"; $params)
+var $response2:=$result2.response
+ALERT($response2.outputText)
+```
+
+## See also
+
+- [OpenAIResponsesResult](OpenAIResponsesResult.md)
+- [OpenAIResponsesAPI](OpenAIResponsesAPI.md)

Documentation/Classes/OpenAIResponseDeleted.md

@@ -0,0 +1,25 @@
+# OpenAIResponseDeleted
+
+The `OpenAIResponseDeleted` class represents the deletion status returned by the Responses API.
+
+## Properties
+
+### id
+**Type**: Text
+
+The ID of the deleted response.
+
+### deleted
+**Type**: Boolean
+
+Indicates whether the response was deleted successfully.
+
+### object
+**Type**: Text
+
+The object type returned by the API.
+
+## See also
+
+- [OpenAIResponseDeletedResult](OpenAIResponseDeletedResult.md)
+- [OpenAIResponsesAPI](OpenAIResponsesAPI.md)

Documentation/Classes/OpenAIResponseDeletedResult.md

@@ -0,0 +1,29 @@
+# OpenAIResponseDeletedResult
+
+The `OpenAIResponseDeletedResult` class contains the result of a response deletion operation.
+
+## Inherits
+
+- [OpenAIResult](OpenAIResult.md)
+
+## Computed properties
+
+| Property  | Type | Description |
+|-----------|------|-------------|
+| `deleted` | [OpenAIResponseDeleted](OpenAIResponseDeleted.md) | Returns the response deletion result from the API response. Returns `Null` if the response does not contain a valid result. |
+
+## Example Usage
+
+```4d
+var $result:=$client.responses.delete("resp_abc123")
+var $deletionStatus:=$result.deleted
+
+If ($deletionStatus#Null) && $deletionStatus.deleted
+    ALERT("Response deleted")
+End if
+```
+
+## See also
+
+- [OpenAIResponsesAPI](OpenAIResponsesAPI.md)
+- [OpenAIResponseDeleted](OpenAIResponseDeleted.md)