Display default LLM model used before prompt instructions

Author: jjmata

app/models/provider/openai.rb

@@ -14,7 +14,7 @@ def supports_model?(model)
     MODELS.include?(model)
   end
 
-  def auto_categorize(transactions: [], user_categories: [], model: "gpt-4.1-mini")
+  def auto_categorize(transactions: [], user_categories: [], model: "")
     with_provider_response do
       raise Error, "Too many transactions to auto-categorize. Max is 25 per request." if transactions.size > 25
 
@@ -36,7 +36,7 @@ def auto_categorize(transactions: [], user_categories: [], model: "gpt-4.1-mini"
     end
   end
 
-  def auto_detect_merchants(transactions: [], user_merchants: [], model: "gpt-4.1-mini")
+  def auto_detect_merchants(transactions: [], user_merchants: [], model: "")
     with_provider_response do
       raise Error, "Too many transactions to auto-detect merchants. Max is 25 per request." if transactions.size > 25
 

app/models/provider/openai/auto_categorizer.rb

@@ -1,4 +1,6 @@
 class Provider::Openai::AutoCategorizer
+  DEFAULT_MODEL = "gpt-4.1-mini"
+
   def initialize(client, model: "", transactions: [], user_categories: [])
     @client = client
     @model = model
@@ -8,7 +10,7 @@ def initialize(client, model: "", transactions: [], user_categories: [])
 
   def auto_categorize
     response = client.responses.create(parameters: {
-      model: model,
+      model: model.presence || DEFAULT_MODEL,
       input: [ { role: "developer", content: developer_message } ],
       text: {
         format: {

app/models/provider/openai/auto_merchant_detector.rb

@@ -1,4 +1,6 @@
 class Provider::Openai::AutoMerchantDetector
+  DEFAULT_MODEL = "gpt-4.1-mini"
+
   def initialize(client, model: "", transactions:, user_merchants:)
     @client = client
     @model = model
@@ -8,7 +10,7 @@ def initialize(client, model: "", transactions:, user_merchants:)
 
   def auto_detect_merchants
     response = client.responses.create(parameters: {
-      model: model,
+      model: model.presence || DEFAULT_MODEL,
       input: [ { role: "developer", content: developer_message } ],
       text: {
         format: {

app/views/settings/ai_prompts/show.html.erb

@@ -26,6 +26,7 @@
                 <span class="text-xs font-medium text-primary uppercase"><%= t(".prompt_instructions") %></span>
                 <%= icon "chevron-right", class: "group-open:transform group-open:rotate-90" %>
               </summary>
+              <pre class="whitespace-pre-wrap text-xs font-mono text-primary">[<%= Provider::Openai::MODELS.join(", ") %>]</pre>
               <div class="mt-2 px-3 py-2 bg-surface-default border border-primary rounded-lg">
                 <pre class="whitespace-pre-wrap text-xs font-mono text-primary"><%= @assistant_config[:instructions] %></pre>
               </div>
@@ -53,6 +54,7 @@
                 <span class="text-xs font-medium text-primary uppercase"><%= t(".prompt_instructions") %></span>
                 <%= icon "chevron-right", class: "group-open:transform group-open:rotate-90" %>
               </summary>
+              <pre class="whitespace-pre-wrap text-xs font-mono text-primary">[<%= Provider::Openai::AutoCategorizer::DEFAULT_MODEL %>]</pre>
               <div class="mt-2 px-3 py-2 bg-surface-default border border-primary rounded-lg">
                 <pre class="whitespace-pre-wrap text-xs font-mono text-primary"><%= @assistant_config[:auto_categorizer]&.instructions || Provider::Openai::AutoCategorizer.new(nil).instructions %></pre>
               </div>
@@ -80,6 +82,7 @@
                 <span class="text-xs font-medium text-primary uppercase"><%= t(".prompt_instructions") %></span>
                 <%= icon "chevron-right", class: "group-open:transform group-open:rotate-90" %>
               </summary>
+              <pre class="whitespace-pre-wrap text-xs font-mono text-primary">[<%= Provider::Openai::AutoMerchantDetector::DEFAULT_MODEL %>]</pre>
               <div class="mt-2 px-3 py-2 bg-surface-default border border-primary rounded-lg">
                 <pre class="whitespace-pre-wrap text-xs font-mono text-primary"><%= @assistant_config[:auto_merchant]&.instructions || Provider::Openai::AutoMerchantDetector.new(nil, model: "", transactions: [], user_merchants: []).instructions %></pre>
               </div>