diff --git a/internal/agent/coordinator.go b/internal/agent/coordinator.go
index d2dc1c90c763bac8b99dc8bf1a2d7439df0ac392..1c05493cd363fc54a0dbc09d1ac9c95f0406afa5 100644
--- a/internal/agent/coordinator.go
+++ b/internal/agent/coordinator.go
@@ -405,6 +405,14 @@ func (c *coordinator) buildAgentModels(ctx context.Context) (Model, Model, error
 	largeModelID := largeModelCfg.Model
 	smallModelID := smallModelCfg.Model
 
+	if largeModelCfg.Provider == openrouter.Name && isExactoSupported(largeModelID) {
+		largeModelID += ":exacto"
+	}
+
+	if smallModelCfg.Provider == openrouter.Name && isExactoSupported(smallModelID) {
+		smallModelID += ":exacto"
+	}
+
 	// FIXME(@andreynering): Temporary fix to get it working.
 	// We need to prefix the model with with `{region}.`
 	if largeModelCfg.Provider == bedrock.Name {
@@ -637,6 +645,17 @@ func (c *coordinator) buildProvider(providerCfg config.ProviderConfig, model con
 	}
 }
 
+func isExactoSupported(modelID string) bool {
+	supportedModels := []string{
+		"moonshotai/kimi-k2-0905",
+		"deepseek/deepseek-v3.1-terminus",
+		"z-ai/glm-4.6",
+		"openai/gpt-oss-120b",
+		"qwen/qwen3-coder",
+	}
+	return slices.Contains(supportedModels, modelID)
+}
+
 func (c *coordinator) Cancel(sessionID string) {
 	c.currentAgent.Cancel(sessionID)
 }