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feat: allow custom Anthropic base URLs #1040

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feat: allow custom Anthropic base URLs #1040

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24 changes: 22 additions & 2 deletions src/lib/models/providers/anthropic/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import AnthropicLLM from './anthropicLLM';

interface AnthropicConfig {
apiKey: string;
baseURL: string;
}

const providerConfigFields: UIConfigField[] = [
Expand All @@ -21,15 +22,33 @@ const providerConfigFields: UIConfigField[] = [
env: 'ANTHROPIC_API_KEY',
scope: 'server',
},
{
type: 'string',
name: 'Base URL',
key: 'baseURL',
description: 'The base URL for the Anthropic API',
required: true,
placeholder: 'Anthropic Base URL',
default: 'https://api.anthropic.com/v1',
env: 'ANTHROPIC_BASE_URL',
scope: 'server',
},
];

class AnthropicProvider extends BaseModelProvider<AnthropicConfig> {
constructor(id: string, name: string, config: AnthropicConfig) {
super(id, name, config);
}

private normalizeBaseURL(url: string): string {
const trimmed = url.trim().replace(/\/+$/, '');
return trimmed.endsWith('/v1') ? trimmed : `${trimmed}/v1`;
}

async getDefaultModels(): Promise<ModelList> {
const res = await fetch('https://api.anthropic.com/v1/models?limit=999', {
const baseURL = this.normalizeBaseURL(this.config.baseURL);

const res = await fetch(`${baseURL}/models?limit=999`, {
method: 'GET',
headers: {
'x-api-key': this.config.apiKey,
Expand Down Expand Up @@ -81,7 +100,7 @@ class AnthropicProvider extends BaseModelProvider<AnthropicConfig> {
return new AnthropicLLM({
apiKey: this.config.apiKey,
model: key,
baseURL: 'https://api.anthropic.com/v1',
baseURL: this.normalizeBaseURL(this.config.baseURL),
});
}

Expand All @@ -97,6 +116,7 @@ class AnthropicProvider extends BaseModelProvider<AnthropicConfig> {

return {
apiKey: String(raw.apiKey),
baseURL: String(raw.baseURL ?? 'https://api.anthropic.com/v1'),
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@cubic-dev-ai cubic-dev-ai bot Mar 8, 2026 •
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P2: baseURL is not validated; invalid config values can normalize to malformed URLs and cause runtime fetch failures.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At src/lib/models/providers/anthropic/index.ts, line 119:

<comment>`baseURL` is not validated; invalid config values can normalize to malformed URLs and cause runtime fetch failures.</comment>

<file context>
@@ -97,6 +116,7 @@ class AnthropicProvider extends BaseModelProvider<AnthropicConfig> {
 
     return {
       apiKey: String(raw.apiKey),
+      baseURL: String(raw.baseURL ?? 'https://api.anthropic.com/v1'),
     };
   }
</file context>
Fix with Cubic

};
}

Expand Down