feat: add gpt-image-1-mini model for OpenAI image generation

packages/image-generation/src/celeste_image_generation/providers/openai/client.py

@@ -114,10 +114,6 @@ def _make_stream_request(
         **parameters: Unpack[ImageGenerationParameters],
     ) -> AsyncIterator[dict[str, Any]]:
         """Make HTTP streaming request and return async iterator of events."""
-        if self.model.id != "gpt-image-1":
-            msg = f"Streaming not supported for model '{self.model.id}'. Only 'gpt-image-1' supports streaming."
-            raise ValueError(msg)
-
         request_body["stream"] = True
 
         if "partial_images" not in request_body:

packages/image-generation/src/celeste_image_generation/providers/openai/models.py

@@ -41,4 +41,19 @@
             ),
         },
     ),
+    Model(
+        id="gpt-image-1-mini",
+        provider=Provider.OPENAI,
+        display_name="GPT Image 1 Mini",
+        streaming=True,
+        parameter_constraints={
+            ImageGenerationParameter.PARTIAL_IMAGES: Range(min=0, max=3),
+            ImageGenerationParameter.ASPECT_RATIO: Choice(
+                options=["1024x1024", "1024x1536", "1536x1024", "auto"]
+            ),
+            ImageGenerationParameter.QUALITY: Choice(
+                options=["low", "medium", "high", "auto"]
+            ),
+        },
+    ),
 ]

packages/image-generation/src/celeste_image_generation/providers/openai/parameters.py

@@ -42,7 +42,7 @@ def map(
 
 
 class PartialImagesMapper(ParameterMapper):
-    """Map partial_images parameter for streaming (gpt-image-1 only)."""
+    """Map partial_images parameter for streaming."""
 
     name = ImageGenerationParameter.PARTIAL_IMAGES
 
@@ -55,7 +55,6 @@ def map(
         """Transform partial_images into provider request.
 
         Controls number of partial images during streaming (0-3).
-        Only supported by gpt-image-1 model.
 
         Args:
             request: Provider request dictionary to modify.
@@ -75,7 +74,7 @@ def map(
 
 
 class QualityMapper(ParameterMapper):
-    """Map quality parameter for DALL-E 3 and gpt-image-1."""
+    """Map quality parameter"""
 
     name = ImageGenerationParameter.QUALITY
 
@@ -90,6 +89,7 @@ def map(
         Controls image quality/detail level.
         - DALL-E 3: "standard" or "hd"
         - gpt-image-1: "low", "medium", "high", or "auto"
+        - gpt-image-1-mini: "low", "medium", "high", or "auto"
         - DALL-E 2: Not supported (no constraint in model)
 
         Args: