Cannot set AI default LLM model even after creating available LLMs

Support
3

Here is some related log information that might be useful, which includes testing LLM availability and setting the default model.

Started POST "/admin/plugins/discourse-ai/ai-llms/test.json" for 172.68.225.73 at 2026-03-20 02:11:07 +0000
Processing by DiscourseAi::Admin::AiLlmsController#test as JSON
  Parameters: {"ai_llm"=>{"max_prompt_tokens"=>"32000", "max_output_tokens"=>"2000", "ai_secret_id"=>"2", "tokenizer"=>"DiscourseAi::Tokenizer::OpenAiTokenizer", "url"=>"https://api.chatanywhere.org", "display_name"=>"gpt-4.1", "name"=>"gpt-4.1", "provider"=>"open_ai", "vision_enabled"=>"false", "input_cost"=>"0.7", "output_cost"=>"2.8", "cached_input_cost"=>"0.7", "cache_write_cost"=>"0.7", "provider_params"=>{"organization"=>"", "disable_native_tools"=>"", "reasoning_effort"=>"none", "disable_streaming"=>"", "service_tier"=>"default"}, "allowed_attachment_types"=>["doc", "docx", "html", "markdown", "pdf", "rtf", "txt"]}}
Completed 200 OK in 252ms (Views: 0.2ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 0.7ms)
Started PUT "/admin/plugins/discourse-ai/ai-llms/3" for 172.68.225.73 at 2026-03-20 02:11:10 +0000
Processing by DiscourseAi::Admin::AiLlmsController#update as */*
  Parameters: {"ai_llm"=>{"max_prompt_tokens"=>32000, "max_output_tokens"=>2000, "ai_secret_id"=>2, "tokenizer"=>"DiscourseAi::Tokenizer::OpenAiTokenizer", "url"=>"https://api.chatanywhere.org", "display_name"=>"gpt-4.1", "name"=>"gpt-4.1", "provider"=>"open_ai", "vision_enabled"=>false, "input_cost"=>0.7, "output_cost"=>2.8, "cached_input_cost"=>0.7, "cache_write_cost"=>0.7, "provider_params"=>{"organization"=>nil, "disable_native_tools"=>nil, "reasoning_effort"=>"none", "disable_streaming"=>nil, "service_tier"=>"default"}, "llm_quotas"=>[], "allowed_attachment_types"=>["doc", "docx", "html", "markdown", "pdf", "rtf", "txt"]}, "id"=>"3"}
Completed 200 OK in 61ms (Views: 14.4ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 0.7ms)
Started GET "/admin/plugins/discourse-ai/ai-llms.json" for 172.68.225.73 at 2026-03-20 02:11:12 +0000
Processing by DiscourseAi::Admin::AiLlmsController#index as JSON
Completed 200 OK in 47ms (Views: 0.8ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 2.2ms)
Started GET "/admin/config/site_settings.json?plugin=discourse-ai&category=discourse_ai" for 172.68.225.73 at 2026-03-20 02:11:12 +0000
Processing by Admin::Config::SiteSettingsController#index as JSON
  Parameters: {"plugin"=>"discourse-ai", "category"=>"discourse_ai"}
Completed 200 OK in 103ms (Views: 0.2ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 4.9ms)
Started GET "/admin/config/site_settings.json?plugin=discourse-ai" for 172.68.225.73 at 2026-03-20 02:11:12 +0000
Processing by Admin::Config::SiteSettingsController#index as JSON
  Parameters: {"plugin"=>"discourse-ai"}
Completed 200 OK in 98ms (Views: 0.1ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 0.0ms)
Started PUT "/admin/site_settings/ai_default_llm_model" for 172.68.225.73 at 2026-03-20 02:11:17 +0000
Processing by Admin::SiteSettingsController#update as */*
  Parameters: {"ai_default_llm_model"=>"3", "id"=>"ai_default_llm_model"}
Completed 422 Unprocessable Entity in 265ms (Views: 0.1ms | ActiveRecord: 0.0ms (0 queries, 0 cached) | GC: 0.0ms)