Revert "Add GPT-5.5 OpenAI models"

This reverts commit c2feba1.

Author: vaur94

packages/opencode/test/tool/fixtures/models-api.json

@@ -845,23 +845,6 @@
         "cost": { "input": 30, "output": 180, "context_over_200k": { "input": 60, "output": 270 } },
         "limit": { "context": 1050000, "input": 922000, "output": 128000 }
       },
-      "gpt-5.5-pro": {
-        "id": "gpt-5.5-pro",
-        "name": "GPT-5.5 Pro",
-        "family": "gpt-pro",
-        "attachment": true,
-        "reasoning": true,
-        "tool_call": true,
-        "structured_output": false,
-        "temperature": false,
-        "knowledge": "2025-08-31",
-        "release_date": "2026-04-23",
-        "last_updated": "2026-04-23",
-        "modalities": { "input": ["text", "image"], "output": ["text"] },
-        "open_weights": false,
-        "cost": { "input": 30, "output": 180, "context_over_200k": { "input": 60, "output": 270 } },
-        "limit": { "context": 1050000, "input": 922000, "output": 128000 }
-      },
       "o3-mini": {
         "id": "o3-mini",
         "name": "o3-mini",
@@ -1139,28 +1122,6 @@
         },
         "limit": { "context": 1050000, "input": 922000, "output": 128000 }
       },
-      "gpt-5.5": {
-        "id": "gpt-5.5",
-        "name": "GPT-5.5",
-        "family": "gpt",
-        "attachment": true,
-        "reasoning": true,
-        "tool_call": true,
-        "structured_output": true,
-        "temperature": false,
-        "knowledge": "2025-08-31",
-        "release_date": "2026-04-23",
-        "last_updated": "2026-04-23",
-        "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
-        "open_weights": false,
-        "cost": {
-          "input": 2.5,
-          "output": 15,
-          "cache_read": 0.25,
-          "context_over_200k": { "input": 5, "output": 22.5, "cache_read": 0.5 }
-        },
-        "limit": { "context": 1050000, "input": 922000, "output": 128000 }
-      },
       "o1": {
         "id": "o1",
         "name": "o1",