Derive provider from model ID

The provider is always the prefix before "/" in the model ID,
so storing it as a separate field is redundant. Replace the
field with a Provider() method.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

internal/cmd/genmodels/main.go

@@ -136,7 +136,6 @@ var generatedModels = map[string]ModelDefinition{
 			&buf,
 			`	%q: {
 		Name:            %q,
-		Provider:        %q,
 		ContextLength:   %d,
 		MaxOutputTokens: %d,
 		Supports: SupportedParameters{
@@ -145,7 +144,6 @@ var generatedModels = map[string]ModelDefinition{
 `,
 			m.ID,
 			m.Name,
-			provider,
 			m.ContextLen,
 			m.TopProvider.MaxCompletionTokens,
 			buildSupports(m.SupportedParams),

pkg/llm/registry.go

@@ -24,7 +24,6 @@ type (
 	ModelDefinition struct {
 		ID              string
 		Name            string
-		Provider        string
 		ContextLength   int
 		MaxOutputTokens int
 		Supports        SupportedParameters
@@ -89,6 +88,13 @@ func (r *Registry) Lookup(modelID string) (ModelDefinition, bool) {
 	return ModelDefinition{}, false
 }
 
+// Provider returns the provider prefix from the model ID (e.g. "anthropic"
+// from "anthropic/claude-opus-4.6").
+func (m *ModelDefinition) Provider() string {
+	provider, _, _ := strings.Cut(m.ID, "/")
+	return provider
+}
+
 func (r *Registry) index(m *ModelDefinition) {
 	r.byID[m.ID] = m
 

pkg/llm/registry_test.go

@@ -28,7 +28,6 @@ func TestRegistry_Lookup(t *testing.T) {
 	r := llm.NewRegistry(map[string]llm.ModelDefinition{
 		"acme/test-model-1.5": {
 			Name:            "Acme: Test Model 1.5",
-			Provider:        "acme",
 			ContextLength:   8192,
 			MaxOutputTokens: 4096,
 			Supports: llm.SupportedParameters{
@@ -46,7 +45,7 @@ func TestRegistry_Lookup(t *testing.T) {
 			m, ok := r.Lookup("acme/test-model-1.5")
 			require.True(t, ok)
 			assert.Equal(t, "acme/test-model-1.5", m.ID)
-			assert.Equal(t, "acme", m.Provider)
+			assert.Equal(t, "acme", m.Provider())
 			assert.Equal(t, 8192, m.ContextLength)
 			assert.Equal(t, 4096, m.MaxOutputTokens)
 		},
@@ -59,7 +58,7 @@ func TestRegistry_Lookup(t *testing.T) {
 
 			m, ok := r.Lookup("test-model-1.5")
 			require.True(t, ok)
-			assert.Equal(t, "acme", m.Provider)
+			assert.Equal(t, "acme", m.Provider())
 		},
 	)
 
@@ -70,7 +69,7 @@ func TestRegistry_Lookup(t *testing.T) {
 
 			m, ok := r.Lookup("test-model-1-5")
 			require.True(t, ok)
-			assert.Equal(t, "acme", m.Provider)
+			assert.Equal(t, "acme", m.Provider())
 		},
 	)
 
@@ -110,16 +109,14 @@ func TestRegistry_Capabilities(t *testing.T) {
 
 	r := llm.NewRegistry(map[string]llm.ModelDefinition{
 		"acme/reasoning-model": {
-			Name:     "Acme: Reasoning Model",
-			Provider: "acme",
+			Name: "Acme: Reasoning Model",
 			Supports: llm.SupportedParameters{
 				Reasoning: true,
 				Seed:      true,
 			},
 		},
 		"acme/chat-model": {
-			Name:     "Acme: Chat Model",
-			Provider: "acme",
+			Name: "Acme: Chat Model",
 			Supports: llm.SupportedParameters{
 				Temperature:      true,
 				TopP:             true,