Feat: openrouter fetch/update free model list

llmapi/models.go

@@ -95,3 +95,52 @@ func (b *Bot) ToPlayer() *models.Player {
 		IsBot:    true,
 	}
 }
+
+type ORModel struct {
+	ID            string `json:"id"`
+	CanonicalSlug string `json:"canonical_slug"`
+	HuggingFaceID string `json:"hugging_face_id"`
+	Name          string `json:"name"`
+	Created       int    `json:"created"`
+	Description   string `json:"description"`
+	ContextLength int    `json:"context_length"`
+	Architecture  struct {
+		Modality         string   `json:"modality"`
+		InputModalities  []string `json:"input_modalities"`
+		OutputModalities []string `json:"output_modalities"`
+		Tokenizer        string   `json:"tokenizer"`
+		InstructType     any      `json:"instruct_type"`
+	} `json:"architecture"`
+	Pricing struct {
+		Prompt            string `json:"prompt"`
+		Completion        string `json:"completion"`
+		Request           string `json:"request"`
+		Image             string `json:"image"`
+		Audio             string `json:"audio"`
+		WebSearch         string `json:"web_search"`
+		InternalReasoning string `json:"internal_reasoning"`
+	} `json:"pricing,omitempty"`
+	TopProvider struct {
+		ContextLength       int  `json:"context_length"`
+		MaxCompletionTokens int  `json:"max_completion_tokens"`
+		IsModerated         bool `json:"is_moderated"`
+	} `json:"top_provider"`
+	PerRequestLimits    any      `json:"per_request_limits"`
+	SupportedParameters []string `json:"supported_parameters"`
+}
+
+// https://openrouter.ai/api/v1/models
+type ORModels struct {
+	Data []ORModel `json:"data"`
+}
+
+func (orm *ORModels) ListFree() []string {
+	resp := []string{}
+	for _, model := range orm.Data {
+		if model.Pricing.Prompt == "0" && model.Pricing.Request == "0" &&
+			model.Pricing.Completion == "0" {
+			resp = append(resp, model.ID)
+		}
+	}
+	return resp
+}