💰 feat: Add gpt-5.3 context window and pricing (#12049)

* 💰 feat: Add gpt-5.3 context window and pricing

* 💰 feat: Add OpenAI cached input pricing and `gpt-5.2-pro` model

    - Add cached input pricing (write/read) for gpt-4o, gpt-4.1, gpt-5.x,
      o1, o3, o4-mini models with correct per-family discount tiers
    - Add gpt-5.2-pro pricing ($21/$168), context window, and max output
    - Pro models (gpt-5-pro, gpt-5.2-pro) correctly excluded from cache
      pricing as OpenAI does not support caching for these

* 🔍 fix: Address review findings for OpenAI pricing

- Add o1-preview to cacheTokenValues (50% discount, same as o1)
- Fix comment to enumerate all models per discount tier
- Add cache tests for dated variants (gpt-4o-2024-08-06, etc.)
- Add gpt-5-mini/gpt-5-nano to 10% ratio invariant test
- Replace forEach with for...of in new test code
- Fix inconsistent test description phrasing
- Add gpt-5.3-preview to context window tests

packages/api/src/utils/tokens.ts

@@ -51,9 +51,11 @@ const openAIModels = {
   'gpt-5': 400000,
   'gpt-5.1': 400000,
   'gpt-5.2': 400000,
+  'gpt-5.3': 400000,
   'gpt-5-mini': 400000,
   'gpt-5-nano': 400000,
   'gpt-5-pro': 400000,
+  'gpt-5.2-pro': 400000,
   'gpt-4o': 127500, // -500 from max
   'gpt-4o-mini': 127500, // -500 from max
   'gpt-4o-2024-05-13': 127500, // -500 from max
@@ -389,9 +391,11 @@ export const modelMaxOutputs = {
   'gpt-5': 128000,
   'gpt-5.1': 128000,
   'gpt-5.2': 128000,
+  'gpt-5.3': 128000,
   'gpt-5-mini': 128000,
   'gpt-5-nano': 128000,
   'gpt-5-pro': 128000,
+  'gpt-5.2-pro': 128000,
   'gpt-oss-20b': 131000,
   'gpt-oss-120b': 131000,
   system_default: 32000,