diff --git a/internal/provider/model_test.go b/internal/provider/model_test.go
new file mode 100644
index 0000000..d8f59f7
--- /dev/null
+++ b/internal/provider/model_test.go
@@ -0,0 +1,331 @@
+package provider
+
+import (
+	"testing"
+
+	"github.com/leonardotrapani/hyprvoice/internal/language"
+)
+
+func TestModel_NeedsDownload(t *testing.T) {
+	tests := []struct {
+		name     string
+		model    Model
+		expected bool
+	}{
+		{
+			name: "local model with LocalInfo",
+			model: Model{
+				ID:    "base.en",
+				Local: true,
+				LocalInfo: &LocalModelInfo{
+					Filename:    "ggml-base.en.bin",
+					Size:        "142MB",
+					DownloadURL: "https://example.com/model.bin",
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "cloud model without LocalInfo",
+			model: Model{
+				ID:       "whisper-1",
+				Local:    false,
+				Endpoint: &EndpointConfig{BaseURL: "https://api.openai.com", Path: "/v1/audio/transcriptions"},
+			},
+			expected: false,
+		},
+		{
+			name: "model with nil LocalInfo",
+			model: Model{
+				ID:        "gpt-4o",
+				LocalInfo: nil,
+			},
+			expected: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := tc.model.NeedsDownload(); got != tc.expected {
+				t.Errorf("NeedsDownload() = %v, want %v", got, tc.expected)
+			}
+		})
+	}
+}
+
+func TestModel_IsStreaming(t *testing.T) {
+	tests := []struct {
+		name     string
+		model    Model
+		expected bool
+	}{
+		{
+			name:     "streaming model",
+			model:    Model{ID: "scribe_v1-streaming", Streaming: true},
+			expected: true,
+		},
+		{
+			name:     "batch model",
+			model:    Model{ID: "whisper-1", Streaming: false},
+			expected: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := tc.model.IsStreaming(); got != tc.expected {
+				t.Errorf("IsStreaming() = %v, want %v", got, tc.expected)
+			}
+		})
+	}
+}
+
+func TestModel_SupportsLanguage(t *testing.T) {
+	allCodes := language.AllLanguageCodes()
+
+	multilingualModel := Model{
+		ID:                 "whisper-large-v3",
+		SupportedLanguages: allCodes,
+	}
+
+	englishOnlyModel := Model{
+		ID:                 "base.en",
+		SupportedLanguages: []string{"en"},
+	}
+
+	tests := []struct {
+		name     string
+		model    Model
+		code     string
+		expected bool
+	}{
+		{
+			name:     "multilingual supports en",
+			model:    multilingualModel,
+			code:     "en",
+			expected: true,
+		},
+		{
+			name:     "multilingual supports es",
+			model:    multilingualModel,
+			code:     "es",
+			expected: true,
+		},
+		{
+			name:     "multilingual supports zh",
+			model:    multilingualModel,
+			code:     "zh",
+			expected: true,
+		},
+		{
+			name:     "english-only supports en",
+			model:    englishOnlyModel,
+			code:     "en",
+			expected: true,
+		},
+		{
+			name:     "english-only does not support es",
+			model:    englishOnlyModel,
+			code:     "es",
+			expected: false,
+		},
+		{
+			name:     "english-only does not support zh",
+			model:    englishOnlyModel,
+			code:     "zh",
+			expected: false,
+		},
+		{
+			name:     "auto always supported on multilingual",
+			model:    multilingualModel,
+			code:     "",
+			expected: true,
+		},
+		{
+			name:     "auto always supported on english-only",
+			model:    englishOnlyModel,
+			code:     "",
+			expected: true,
+		},
+		{
+			name:     "empty SupportedLanguages still supports auto",
+			model:    Model{ID: "empty", SupportedLanguages: []string{}},
+			code:     "",
+			expected: true,
+		},
+		{
+			name:     "empty SupportedLanguages does not support en",
+			model:    Model{ID: "empty", SupportedLanguages: []string{}},
+			code:     "en",
+			expected: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := tc.model.SupportsLanguage(tc.code); got != tc.expected {
+				t.Errorf("SupportsLanguage(%q) = %v, want %v", tc.code, got, tc.expected)
+			}
+		})
+	}
+}
+
+func TestModel_SupportsAllLanguages(t *testing.T) {
+	allCodes := language.AllLanguageCodes()
+
+	tests := []struct {
+		name     string
+		model    Model
+		expected bool
+	}{
+		{
+			name: "model with all 57 languages",
+			model: Model{
+				ID:                 "whisper-large-v3",
+				SupportedLanguages: allCodes,
+			},
+			expected: true,
+		},
+		{
+			name: "english-only model",
+			model: Model{
+				ID:                 "base.en",
+				SupportedLanguages: []string{"en"},
+			},
+			expected: false,
+		},
+		{
+			name: "model with some languages",
+			model: Model{
+				ID:                 "partial",
+				SupportedLanguages: []string{"en", "es", "fr", "de"},
+			},
+			expected: false,
+		},
+		{
+			name: "model with empty languages",
+			model: Model{
+				ID:                 "empty",
+				SupportedLanguages: []string{},
+			},
+			expected: false,
+		},
+		{
+			name: "model with nil languages",
+			model: Model{
+				ID:                 "nil",
+				SupportedLanguages: nil,
+			},
+			expected: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := tc.model.SupportsAllLanguages(); got != tc.expected {
+				t.Errorf("SupportsAllLanguages() = %v, want %v", got, tc.expected)
+			}
+		})
+	}
+}
+
+func TestModelType_Constants(t *testing.T) {
+	// verify ModelType constants exist and are distinct
+	if Transcription == LLM {
+		t.Error("Transcription and LLM should be different")
+	}
+
+	// verify they're the expected values
+	if Transcription != 0 {
+		t.Errorf("Transcription = %d, want 0", Transcription)
+	}
+	if LLM != 1 {
+		t.Errorf("LLM = %d, want 1", LLM)
+	}
+}
+
+func TestEndpointConfig_Fields(t *testing.T) {
+	endpoint := EndpointConfig{
+		BaseURL: "https://api.openai.com",
+		Path:    "/v1/audio/transcriptions",
+	}
+
+	if endpoint.BaseURL != "https://api.openai.com" {
+		t.Errorf("BaseURL = %q, want 'https://api.openai.com'", endpoint.BaseURL)
+	}
+	if endpoint.Path != "/v1/audio/transcriptions" {
+		t.Errorf("Path = %q, want '/v1/audio/transcriptions'", endpoint.Path)
+	}
+}
+
+func TestLocalModelInfo_Fields(t *testing.T) {
+	info := LocalModelInfo{
+		Filename:    "ggml-base.en.bin",
+		Size:        "142MB",
+		DownloadURL: "https://huggingface.co/ggerganov/whisper.cpp/resolve/main/ggml-base.en.bin",
+	}
+
+	if info.Filename != "ggml-base.en.bin" {
+		t.Errorf("Filename = %q, want 'ggml-base.en.bin'", info.Filename)
+	}
+	if info.Size != "142MB" {
+		t.Errorf("Size = %q, want '142MB'", info.Size)
+	}
+	if info.DownloadURL != "https://huggingface.co/ggerganov/whisper.cpp/resolve/main/ggml-base.en.bin" {
+		t.Errorf("DownloadURL = %q", info.DownloadURL)
+	}
+}
+
+func TestModel_AllFields(t *testing.T) {
+	// verify all Model struct fields can be set and read correctly
+	model := Model{
+		ID:                 "test-model",
+		Name:               "Test Model",
+		Description:        "A test model for verification",
+		Type:               Transcription,
+		Streaming:          true,
+		Local:              true,
+		AdapterType:        "test-adapter",
+		SupportedLanguages: []string{"en", "es"},
+		Endpoint: &EndpointConfig{
+			BaseURL: "https://api.test.com",
+			Path:    "/v1/test",
+		},
+		LocalInfo: &LocalModelInfo{
+			Filename:    "test.bin",
+			Size:        "100MB",
+			DownloadURL: "https://example.com/test.bin",
+		},
+	}
+
+	if model.ID != "test-model" {
+		t.Errorf("ID = %q, want 'test-model'", model.ID)
+	}
+	if model.Name != "Test Model" {
+		t.Errorf("Name = %q, want 'Test Model'", model.Name)
+	}
+	if model.Description != "A test model for verification" {
+		t.Errorf("Description = %q", model.Description)
+	}
+	if model.Type != Transcription {
+		t.Errorf("Type = %v, want Transcription", model.Type)
+	}
+	if !model.Streaming {
+		t.Error("Streaming should be true")
+	}
+	if !model.Local {
+		t.Error("Local should be true")
+	}
+	if model.AdapterType != "test-adapter" {
+		t.Errorf("AdapterType = %q, want 'test-adapter'", model.AdapterType)
+	}
+	if len(model.SupportedLanguages) != 2 {
+		t.Errorf("SupportedLanguages length = %d, want 2", len(model.SupportedLanguages))
+	}
+	if model.Endpoint == nil {
+		t.Error("Endpoint should not be nil")
+	}
+	if model.LocalInfo == nil {
+		t.Error("LocalInfo should not be nil")
+	}
+}
diff --git a/progress.txt b/progress.txt
index 4e38613..b6a2c53 100644
--- a/progress.txt
+++ b/progress.txt
@@ -62,3 +62,15 @@ Started: Sun Feb  1 12:22:47 AM CET 2026
 - Added MockStreamingAdapter and comprehensive tests
 - Tests verify: start/stop, result accumulation, partial result filtering, error handling, concurrent access
 - All tests passing with -race flag, typecheck passes
+
+### Task 7: Write tests for Model, Provider, and interfaces
+- Created `internal/provider/model_test.go`
+- TestModel_NeedsDownload: local with LocalInfo = true, cloud = false, nil = false
+- TestModel_IsStreaming: returns Streaming field value
+- TestModel_SupportsLanguage: multilingual supports all, english-only supports en, auto always true
+- TestModel_SupportsAllLanguages: true when 57 languages, false otherwise
+- TestModelType_Constants: Transcription=0, LLM=1
+- TestEndpointConfig_Fields, TestLocalModelInfo_Fields: struct fields accessible
+- TestModel_AllFields: comprehensive struct field test
+- provider_test.go already had GetModel, ModelsOfType, FindModelByID, ModelsForLanguage, ValidateModelLanguage tests
+- All tests passing, typecheck passes
diff --git a/tasks/prd.jsonc b/tasks/prd.jsonc
index 30f2866..d9597d9 100644
--- a/tasks/prd.jsonc
+++ b/tasks/prd.jsonc
@@ -185,7 +185,7 @@
 				"Language validation helpers tested with proper error messages",
 				"Typecheck passes"
 			],
-			"passes": false
+			"passes": true
 		},
 		// ============================================================================
 		// PHASE 2: MIGRATE PROVIDERS TO NEW MODEL STRUCTURE