OpenAI's ChatGPT web app shows new strings referencing 'GPT-5', 'GPT-5-pro', 'GPT-5-thinki

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Aug 18, 2026 19:18 UTC web app https://chatgpt.com

OpenAI's ChatGPT web app shows new strings referencing 'GPT-5', 'GPT-5-pro', 'GPT-5-thinking', and 'gpt-5.6-luna-wm', alongside a host of internal feature flags and endpoints.

READY TO POST:

looks like openai's prepping for gpt-5! seeing a bunch of new model_id strings in the chatgpt web app including 'gpt-5-pro' and 'gpt-5-thinking'.

the chatgpt frontend just got an update with references to 'gpt-5.6-luna-wm' and several internal feature flags. definitely something brewing at openai.

⚠️ FROM WEB-APP BUNDLE — may include vendored-dependency strings, verify before posting. ChatGPT web app (https://chatgpt.com) deployed new frontend code [f9a559c84fd32bb9 -> a34cf4dcf8582b33]: +52052 strings, -2338 strings, 301 interesting [model_id] (22) + /cdn/assets/gpt-details-gt8i8zk7.css + /cdn/assets/gpt-icon-h9k3y3p1.css + GPT-5 + admin/model-access/gpt-5.6-preview + gpt-4 + gpt-4l + gpt-4o + gpt-4o-gdrive + gpt-4o-gdrive-0212 + gpt-4o-gdrive-0314 + gpt-4o-gdrive-1007-mclick + gpt-4o-gdrive-1124 + gpt-4o-gdrive-1124-citation + gpt-4o-mini-filled + gpt-5 + gpt-5-pro + gpt-5-thinking + gpt-5.6-luna-wm + o3-mini-high-in-context-upsell-plus + o4-mini + routes/admin_.model-access.gpt-5[.]6-preview + ve reached the current usage cap for GPT-4. You can continue with the default model now, or try again {formattedTime}. <link>Learn more</link>`,values:{link:tJt,formattedTime:a}}):(0,KH.jsx)($,{id:`TextMessageDisplay.gptUsageCapExceededCustomFeature`,defaultMessage:`You [feature_flag] (131) + ,"data-internal-model-search": + ,action:E,actionMessageDescriptor:dz.focusPromptTextarea,group:Em.Internal,bindings:[{binding:[Mg.Shift,Mg.Escape]}]},{key: + ,e[e.INTERNAL=1]= + ,group:Pfe.Internal,bindings:[{binding:[ol.Shift,ol.ArrowDown]}],actionMessageDescriptor:Ad({id: + ,group:Pfe.Internal,bindings:[{binding:[ol.Shift,ol.ArrowUp]}],actionMessageDescriptor:Ad({id: + ,onChange:e=>{f(e.currentTarget.value)},placeholder:u.formatMessage(u4.internalModelsPlaceholder),selectAllOnFocus:!1,value:d}),(0,l4.jsx)( + ,void 0,{surface:e,account_scope:t,is_enabled:String(n)}),q.logStructuredEvent( + /cdn/assets/contentful-dynamic-feature-page-b44dy1sb.js + /cdn/assets/contentful-feature-page-bz3c6b1e.js + /cdn/assets/internal-render-conversation-j9idwwgm.js + /cdn/assets/internal-render-conversation_.queued-bonemfyb.js + /cdn/assets/internal.widget-studio.open-conversation-imoe7dyk.js + 3VyEPC5dTP_model_instruction