Add claude-sonnet-5 to AI-credits pricing to prevent runtime unknown-model rejection (#5993)

* Initial plan

* fix(api-proxy): add claude-sonnet-5 ai credits pricing

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: Copilot

containers/api-proxy/ai-credits-pricing.js

@@ -17,6 +17,7 @@ module.exports = Object.freeze({
   'claude-sonnet-4':   { input: 3.00,  cachedInput: 0.30,  cacheWrite: 3.75, output: 15.00 },
   'claude-sonnet-4-5': { input: 3.00,  cachedInput: 0.30,  cacheWrite: 3.75, output: 15.00 },
   'claude-sonnet-4-6': { input: 3.00,  cachedInput: 0.30,  cacheWrite: 3.75, output: 15.00 },
+  'claude-sonnet-5':   { input: 3.00,  cachedInput: 0.30,  cacheWrite: 3.75, output: 15.00 },
   'claude-opus-4-5':   { input: 5.00,  cachedInput: 0.50,  cacheWrite: 6.25, output: 25.00 },
   'claude-opus-4-6':   { input: 5.00,  cachedInput: 0.50,  cacheWrite: 6.25, output: 25.00 },
   'claude-opus-4-7':   { input: 5.00,  cachedInput: 0.50,  cacheWrite: 6.25, output: 25.00 },

containers/api-proxy/guards/ai-credits-guard.test.js

@@ -84,6 +84,21 @@ describe('ai-credits-guard', () => {
     expect(getAiCreditsReflectState().by_model['claude-sonnet-4-6-20260601'].total).toBeCloseTo(0.5175, 10);
   });
 
+  it('resolves claude-sonnet-5 from curated pricing without unknown-model rejection', () => {
+    process.env.AWF_MAX_AI_CREDITS = '10';
+    resetAiCreditsGuardForTests();
+
+    const usage = applyAiCreditsUsage({
+      input_tokens: 2000,
+      cache_read_tokens: 1000,
+      cache_write_tokens: 500,
+      output_tokens: 100,
+    }, 'claude-sonnet-5');
+
+    expect(usage.aiCreditsThisResponse).toBeCloseTo(0.5175, 10);
+    expect(checkUnknownModelRejection('claude-sonnet-5')).toBeNull();
+  });
+
   it('does not double-count cached tokens when input_tokens is total-inclusive (OpenAI-style)', () => {
     // OpenAI (Chat Completions and Responses API) reports prompt_tokens/input_tokens
     // as the TOTAL input, with cached tokens being a subset. When no provider is
@@ -432,6 +447,9 @@ describe('ai-credits-guard', () => {
 
       const result = checkUnknownModelRejection('gpt-5-mini');
       expect(result).toBeNull();
+
+      const sonnet5 = checkUnknownModelRejection('claude-sonnet-5');
+      expect(sonnet5).toBeNull();
     });
   });
 });