| 1 | package openrouter |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "fmt" |
| 6 | "net/http" |
| 7 | "slices" |
| 8 | "sort" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | ) |
| 12 | |
| 13 | const modelsURL = "https://openrouter.ai/api/v1/models" |
| 14 | |
| 15 | // EnterByHandCategory is the special category label for manual model ID entry. |
| 16 | const EnterByHandCategory = "✏ Enter model ID" |
| 17 | |
| 18 | // ORModel represents a model available via the OpenRouter API. |
| 19 | type ORModel struct { |
| 20 | ID string `json:"id"` |
| 21 | Name string `json:"name"` |
| 22 | Created float64 `json:"created"` |
| 23 | ContextLength int `json:"context_length"` |
| 24 | Pricing struct { |
| 25 | Prompt string `json:"prompt"` |
| 26 | Completion string `json:"completion"` |
| 27 | } `json:"pricing"` |
| 28 | SupportedParameters []string `json:"supported_parameters"` |
| 29 | Architecture struct { |
| 30 | OutputModalities []string `json:"output_modalities"` |
| 31 | } `json:"architecture"` |
| 32 | } |
| 33 | |
| 34 | // DisplayName returns a human-friendly name for the model. |
| 35 | func (m ORModel) DisplayName() string { |
| 36 | if m.Name != "" { |
| 37 | return m.Name |
| 38 | } |
| 39 | return m.ID |
| 40 | } |
| 41 | |
| 42 | // isAgentCompatible returns true if the model supports tool calling |
| 43 | // and produces text output, making it suitable for coding agents. |
| 44 | func (m ORModel) isAgentCompatible() bool { |
| 45 | hasTools := slices.Contains(m.SupportedParameters, "tools") |
| 46 | if !hasTools { |
| 47 | return false |
| 48 | } |
| 49 | hasText := slices.Contains(m.Architecture.OutputModalities, "text") |
| 50 | return hasText |
| 51 | } |
| 52 | |
| 53 | func (m ORModel) isFree() bool { |
| 54 | p, _ := strconv.ParseFloat(m.Pricing.Prompt, 64) |
| 55 | c, _ := strconv.ParseFloat(m.Pricing.Completion, 64) |
| 56 | return p == 0 && c == 0 |
| 57 | } |
| 58 | |
| 59 | var popularPrefixes = []string{ |
| 60 | "anthropic/", |
| 61 | "openai/", |
| 62 | "google/", |
| 63 | "meta-llama/", |
| 64 | "deepseek/", |
| 65 | "mistralai/", |
| 66 | "x-ai/", |
| 67 | "cohere/", |
| 68 | "qwen/", |
| 69 | } |
| 70 | |
| 71 | func (m ORModel) isPopular() bool { |
| 72 | for _, prefix := range popularPrefixes { |
| 73 | if strings.HasPrefix(m.ID, prefix) { |
| 74 | return true |
| 75 | } |
| 76 | } |
| 77 | return false |
| 78 | } |
| 79 | |
| 80 | // ListModels fetches available models from the OpenRouter API. |
| 81 | func ListModels(apiKey string) ([]ORModel, error) { |
| 82 | req, err := http.NewRequest("GET", modelsURL, nil) |
| 83 | if err != nil { |
| 84 | return nil, err |
| 85 | } |
| 86 | if apiKey != "" { |
| 87 | req.Header.Set("Authorization", "Bearer "+apiKey) |
| 88 | } |
| 89 | req.Header.Set("Accept", "application/json") |
| 90 | |
| 91 | resp, err := http.DefaultClient.Do(req) |
| 92 | if err != nil { |
| 93 | return nil, fmt.Errorf("fetching models: %w", err) |
| 94 | } |
| 95 | defer resp.Body.Close() |
| 96 | |
| 97 | if resp.StatusCode != http.StatusOK { |
| 98 | return nil, fmt.Errorf("models endpoint returned %s", resp.Status) |
| 99 | } |
| 100 | |
| 101 | var result struct { |
| 102 | Data []ORModel `json:"data"` |
| 103 | } |
| 104 | if err := json.NewDecoder(resp.Body).Decode(&result); err != nil { |
| 105 | return nil, fmt.Errorf("parsing models: %w", err) |
| 106 | } |
| 107 | |
| 108 | return FilterAgentCompatible(result.Data), nil |
| 109 | } |
| 110 | |
| 111 | // FilterAgentCompatible returns only models that support tool calling |
| 112 | // and produce text output, suitable for coding agents. |
| 113 | func FilterAgentCompatible(models []ORModel) []ORModel { |
| 114 | var out []ORModel |
| 115 | for _, m := range models { |
| 116 | if m.isAgentCompatible() { |
| 117 | out = append(out, m) |
| 118 | } |
| 119 | } |
| 120 | return out |
| 121 | } |
| 122 | |
| 123 | // CategorizeModels groups models into Free, Popular, and Newest categories. |
| 124 | // Returns category names and a map of category → models. |
| 125 | func CategorizeModels(models []ORModel) ([]string, map[string][]ORModel) { |
| 126 | categories := []string{"Free", "Popular", "Newest", EnterByHandCategory} |
| 127 | grouped := make(map[string][]ORModel) |
| 128 | |
| 129 | var free []ORModel |
| 130 | for _, m := range models { |
| 131 | if m.isFree() { |
| 132 | free = append(free, m) |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | sort.Slice(free, func(i, j int) bool { |
| 137 | return strings.ToLower(free[i].Name) < strings.ToLower(free[j].Name) |
| 138 | }) |
| 139 | |
| 140 | // Newest: sort by created desc, take top 40. |
| 141 | newest := make([]ORModel, len(models)) |
| 142 | copy(newest, models) |
| 143 | sort.Slice(newest, func(i, j int) bool { |
| 144 | return newest[i].Created > newest[j].Created |
| 145 | }) |
| 146 | if len(newest) > 40 { |
| 147 | newest = newest[:40] |
| 148 | } |
| 149 | |
| 150 | grouped["Free"] = free |
| 151 | grouped["Newest"] = newest |
| 152 | |
| 153 | return categories, grouped |
| 154 | } |
| 155 | |
| 156 | // Provider display names and ordering for the Popular drill-down. |
| 157 | var providerDisplayNames = map[string]string{ |
| 158 | "anthropic": "Anthropic", |
| 159 | "openai": "OpenAI", |
| 160 | "google": "Google", |
| 161 | "meta-llama": "Meta", |
| 162 | "deepseek": "DeepSeek", |
| 163 | "mistralai": "Mistral", |
| 164 | "x-ai": "xAI", |
| 165 | "cohere": "Cohere", |
| 166 | "qwen": "Qwen", |
| 167 | } |
| 168 | |
| 169 | var providerOrder = []string{ |
| 170 | "anthropic", "openai", "google", "meta-llama", |
| 171 | "deepseek", "mistralai", "x-ai", "cohere", "qwen", |
| 172 | } |
| 173 | |
| 174 | // GroupPopularByProvider groups popular models by their provider prefix. |
| 175 | // Returns ordered provider display names and a map of name → models. |
| 176 | func GroupPopularByProvider(models []ORModel) ([]string, map[string][]ORModel) { |
| 177 | grouped := make(map[string][]ORModel) |
| 178 | for _, m := range models { |
| 179 | if !m.isPopular() { |
| 180 | continue |
| 181 | } |
| 182 | prefix := providerPrefix(m.ID) |
| 183 | name := providerDisplayName(prefix) |
| 184 | grouped[name] = append(grouped[name], m) |
| 185 | } |
| 186 | for name := range grouped { |
| 187 | sort.Slice(grouped[name], func(i, j int) bool { |
| 188 | return grouped[name][i].Created > grouped[name][j].Created |
| 189 | }) |
| 190 | } |
| 191 | var providers []string |
| 192 | for _, prefix := range providerOrder { |
| 193 | name := providerDisplayName(prefix) |
| 194 | if _, ok := grouped[name]; ok { |
| 195 | providers = append(providers, name) |
| 196 | } |
| 197 | } |
| 198 | return providers, grouped |
| 199 | } |
| 200 | |
| 201 | func providerPrefix(id string) string { |
| 202 | if i := strings.Index(id, "/"); i > 0 { |
| 203 | return id[:i] |
| 204 | } |
| 205 | return id |
| 206 | } |
| 207 | |
| 208 | func providerDisplayName(prefix string) string { |
| 209 | if name, ok := providerDisplayNames[prefix]; ok { |
| 210 | return name |
| 211 | } |
| 212 | return prefix |
| 213 | } |
| 214 | |
| 215 | // AllModelIDs returns a set of all model IDs for validation. |
| 216 | func AllModelIDs(models []ORModel) map[string]bool { |
| 217 | ids := make(map[string]bool, len(models)) |
| 218 | for _, m := range models { |
| 219 | ids[m.ID] = true |
| 220 | } |
| 221 | return ids |
| 222 | } |
| 223 | |