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feat(vertex): add Imagen image generation model support

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Add support for Imagen 3.0 and 4.0 image generation models in Vertex AI:

- Add 5 Imagen model definitions (4.0, 4.0-ultra, 4.0-fast, 3.0, 3.0-fast)
- Implement :predict action routing for Imagen models
- Convert Imagen request/response format to match Gemini structure like gemini-3-pro-image
- Transform prompts to Imagen's instances/parameters format
- Convert base64 image responses to Gemini-compatible inline data
This commit is contained in:
dinhkarate
2026-01-20 01:26:37 +07:00
parent 5baa753539
commit 8734d4cb90
2 changed files with 256 additions and 27 deletions
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61
internal/registry/model_definitions.go
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@@ -287,6 +287,67 @@ func GetGeminiVertexModels() []*ModelInfo {
SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
Thinking: &ThinkingSupport{Min: 128, Max: 32768, ZeroAllowed: false, DynamicAllowed: true, Levels: []string{"low", "high"}},
},
// Imagen image generation models - use :predict action
{
ID: "imagen-4.0-generate-001",
Object: "model",
Created: 1750000000,
OwnedBy: "google",
Type: "gemini",
Name: "models/imagen-4.0-generate-001",
Version: "4.0",
DisplayName: "Imagen 4.0 Generate",
Description: "Imagen 4.0 image generation model",
SupportedGenerationMethods: []string{"predict"},
},
{
ID: "imagen-4.0-ultra-generate-001",
Object: "model",
Created: 1750000000,
OwnedBy: "google",
Type: "gemini",
Name: "models/imagen-4.0-ultra-generate-001",
Version: "4.0",
DisplayName: "Imagen 4.0 Ultra Generate",
Description: "Imagen 4.0 Ultra high-quality image generation model",
SupportedGenerationMethods: []string{"predict"},
},
{
ID: "imagen-3.0-generate-002",
Object: "model",
Created: 1740000000,
OwnedBy: "google",
Type: "gemini",
Name: "models/imagen-3.0-generate-002",
Version: "3.0",
DisplayName: "Imagen 3.0 Generate",
Description: "Imagen 3.0 image generation model",
SupportedGenerationMethods: []string{"predict"},
},
{
ID: "imagen-3.0-fast-generate-001",
Object: "model",
Created: 1740000000,
OwnedBy: "google",
Type: "gemini",
Name: "models/imagen-3.0-fast-generate-001",
Version: "3.0",
DisplayName: "Imagen 3.0 Fast Generate",
Description: "Imagen 3.0 fast image generation model",
SupportedGenerationMethods: []string{"predict"},
},
{
ID: "imagen-4.0-fast-generate-001",
Object: "model",
Created: 1750000000,
OwnedBy: "google",
Type: "gemini",
Name: "models/imagen-4.0-fast-generate-001",
Version: "4.0",
DisplayName: "Imagen 4.0 Fast Generate",
Description: "Imagen 4.0 fast image generation model",
SupportedGenerationMethods: []string{"predict"},
},
}
}