Update cost assertions in formatter tests for accuracy

Author: ArtyomVancyan

tests/lib/test_formatter.py

@@ -304,7 +304,7 @@ def test_zero_tokens(self):
 
     def test_known_model_with_tokens(self):
         result = Formatter.costs("openai/gpt-4o-mini", 1000, 2000)
-        assert result == {"cached": "0.000075", "total": "0.0012"}
+        assert result == {"cached": "0.0", "total": "0.00119"}
 
 
 class TestMetrics:
@@ -324,7 +324,7 @@ def test_cost_for_known_model(self):
             outputs={"total_tokens": 2000, "cached_tokens": 1000},
         )
         result = Formatter.metrics(run)
-        assert result["costs"] == {"cached": "0.000075", "total": "0.0012"}
+        assert result["costs"] == {"cached": "0.0", "total": "0.00119"}
 
     def test_unknown_model_fallback(self):
         run = make_metrics_run()