Optimizely Developer Weekly

Feb 08 – Feb 15, 2026
Welcome to this week’s Optimizely Developer Weekly! Our top story tackles the odd behavior of CMS 12 after an upgrade from CMS 11—debuggers, keep a close eye on that. On the flip side, you’ll find the brand‑new AI Assistant Chat, advanced form‑submission features for CMS 12, and fresh insights into personalization—audience targeting in CMS 13 and personalized user journeys—ready to boost your projects.
17 items from 5 categories

Top Stories

Optimizely CMS 12 behaving strangely after upgrading from CMS 11

Optimizely CMS 12 introduced an assembly version mismatch that breaks content‑type changes after upgrading from CMS 11. The issue is caused by mismatched content‑type assembly versions, and the fix is a simple update of those references to the correct CMS 12 assemblies. Developers should read the blog post for the detailed root cause and quick patch steps to restore functionality.

9/10   Optimizely Blog   Feb 10, 2026

Install the new AI Assistant Chat for Optimizely

Version 3.0 of Epicweb.Optimizely.AIAssistant now ships an AI Assistant Chat that embeds conversational AI directly into the Optimizely CMS editor. Developers can chat with the assistant to auto‑populate fields, generate content, and streamline editing of pages, blocks, and media. This reduces manual data entry and speeds up content creation right inside the CMS.

8/10   Optimizely Blog   Feb 12, 2026

Install the new AI Assistant Chat for Optimizely

Optimizely CMS now ships with the new Epicweb.Optimizely.AIAssistant 3.0, a built‑in AI chat that lets developers converse with AI while editing pages, blocks, and media. The assistant auto‑fills fields, suggests content, and streamlines workflow, reducing guesswork and speeding up content creation.

8/10   Community Blog - optimizely.blog   Feb 12, 2026

Epicweb.Optimizely.AIAssistant v3.0.1

**TLDR:** Epicweb.Optimizely.AIAssistant v3.0.1 expands its AI integration to support a wide range of LLMs—including GPT‑5, ChatGPT, Azure AI, Meta Llama, Google Gemini, Anthropic Claude, Writer.com, and Recraft AI—within Optimizely Content Cloud and Commerce PaaS. The update also adds real‑time translation, image generation, and automated alt‑text creation, making it a versatile tool for developers building AI‑powered content experiences.

8/10   Optimizely NuGet   Feb 12, 2026

Advanced Form Submissions for Optimizely CMS 12

Optimizely CMS 12 now includes an Advanced Form Submissions module that replaces the basic submission view with a flexible, personalized interface and powerful management tools. Developers can efficiently handle enterprise‑scale form data, customize submission handling, and integrate advanced analytics and reporting. This update streamlines workflows and gives large deployments greater control over form processing and data management.

8/10   Optimizely Blog   Feb 12, 2026

Cms Updates

CmsUpdates: Explore CMS 13’s new Audiences for editor‑friendly personalization, the integrated Journey Builder for real‑time user journeys, the Epicweb AI‑Assistant chat that streamlines SEO and content management, and the pre‑release Visual Builder that lets you create rich drag‑and‑drop sections with ExperienceData and SectionData.

Personalisation in CMS 13 Using Audiences

CMS 13 continues to support built‑in personalisation without extra products, now using **Audiences** (formerly Visitor Groups) that can be defined and managed directly in the CMS UI. Audiences let editors toggle content components (e.g., hero, jumbotron) per visitor segment and preview those variations before publishing. This rules‑based approach delivers immediate, editor‑friendly targeting while leaving a clear path to more advanced personalization later.

8/10   Optimizely Blog   Feb 12, 2026

Personalized User Journeys with Optimizely CMS

Optimizely CMS now includes a built‑in Journey Builder that lets developers create, edit, and trigger personalized user journeys directly within the content editor, eliminating the need for separate Experience Cloud tools. The new Journey API exposes endpoints for defining segments, events, and path logic, enabling real‑time personalization via standard CMS APIs. Developers can hook into these APIs to deliver dynamic content and track engagement, streamlining the integration of marketing automation with content management.

8/10   Optimizely Blog   Feb 10, 2026

AI Assistant Chat for Optimizely

Optimizely CMS 12/13 now ship the Epicweb AI‑Assistant chat, letting editors analyze, manage, translate, and optimize content for SEO and AEO—all within the CMS interface. This hands‑on AI integration reduces context switching and speeds up content workflows for developers and editors alike.

8/10   Optimizely Blog   Feb 08, 2026

Optimizely CMS 13 (Pre-release) Visual Builder

Optimizely CMS 13 pre‑release now brings a Visual Builder that lets you define **ExperienceData** and **SectionData** types to build rich, drag‑and‑drop sections. The post shows a proof‑of‑concept on an upgraded Alloy MVC site, demonstrating how to model these types and set up editor‑friendly style options for Visual Builder elements. Check the sample repo (github.com/evest/cms13-test1) for ready‑to‑use code and configuration tips.

7/10   Optimizely Blog   Feb 11, 2026

Release Notes

This issue announces two key AI‑Assistant upgrades: the new Epicweb.Optimizely.AIAssistant.Tools v3.0.0 bundles integrated AI and MCP ServerTool capabilities into a single package, streamlining server‑side AI workflows in Optimizely, while Epicweb.Optimizely.AIAssistant.LanguageManager v2.1.0 automatically translates pages and blocks via EPiServer.Labs.LanguageManager when paired with the AI‑Assistant, simplifying multilingual content creation.

Epicweb.Optimizely.AIAssistant.Tools v3.0.0

Epicweb.Optimizely.AIAssistant.Tools 3.0.0 introduces integrated AI and MCP ServerTool capabilities that seamlessly work with the Epicweb AI‑Assistant for Optimizely. The update bundles these tools into a single package, simplifying setup and improving performance for AI‑driven workflows. Developers can now leverage enhanced server‑side AI features directly within the Optimizely environment.

8/10   Optimizely NuGet   Feb 12, 2026

Epicweb.Optimizely.AIAssistant.LanguageManager v2.1.0

Epicweb has released **v2.1.0** of its AI‑Assistant Language Manager. It now automatically translates pages and blocks using the EPiServer.Labs.LanguageManager package, but only when paired with the Epicweb AI‑Assistant for Optimizely. This update streamlines multilingual content creation for Optimizely developers.

6/10   Optimizely NuGet   Feb 12, 2026

Community Content

In this CommunityContent roundup we spotlight Epicweb’s AI‑Assistant Chat now embedded in Optimizely CMS, empowering editors to analyze, manage, translate and optimize SEO/AEO content directly in the editor, and we share key takeaways from Episode 2 of the OMVP Strategy Roundtable, where experts argue that successful AI adoption hinges on people, ownership and evolving operating models, offering practical lessons on scaling experiments and turning pilots into sustainable impact.

AI Assistant Chat for Optimizely

Epicweb’s AI‑Assistant Chat is now built into Optimizely CMS 12 and 13, letting editors analyze, manage, translate and optimize SEO/AEO content directly inside the CMS. This integration streamlines content workflows and boosts editorial efficiency. Developers can embed AI‑powered features straight into the CMS experience for faster, smarter content management.

7/10   Community Blog - optimizely.blog   Feb 08, 2026

Episode 2 of the OMVP Strategy Roundtable is out

Episode 2 of Optimizely’s OMVP Strategy Roundtable tackles real‑world AI adoption, arguing that success hinges on people, ownership and evolving operating models—not just new tech. Panelists share practical lessons on scaling experiments, setting clear metrics and overcoming resistance, with the conversation split into two parts on Optimizely Academy (full episode on Spotify). Developers involved in AI strategy or experimentation will find actionable insights on turning pilots into sustainable impact.

6/10   Optimizely Blog   Feb 10, 2026

Tutorials And Guides

Explore three new tutorials and guides: a .NET 8.0 demo for trimming MAU inflation via the Optimizely REST API, a step‑by‑step Visual Builder walkthrough for a 66 %/33 % two‑column layout, and a performance warning on storing complex types in PropertyList properties.

Reducing Web Experimentation MAU Using the REST API

Optimizely Web Experimentation’s MAU metric is inflated by any page that loads the snippet, even when no experiment runs. A new .NET 8.0 POC project shows how to use the REST API to fetch active experiments, filter them by URL, cache results for 15 minutes, and expose a minimal API that clears the cache on webhook events. By conditionally disabling or opting‑out of the snippet based on these checks, developers can stop unnecessary MAU counting and reduce costs for multi‑site setups.

7/10   Optimizely Blog   Feb 13, 2026

Building a TwoColumnWideLeftSection in Optimizely CMS 13 Visual Builder

TLDR: Optimizely 13 now includes a step‑by‑step guide for creating a “66 % / 33 %” two‑column layout in Visual Builder. The tutorial shows how to use the new composition tag helpers—`<epi-grid>`, `<epi-row>`, `<epi-column>`, and `<epi-component>`—to build a Bootstrap container with a single row and two columns. This makes it easier for developers to quickly craft wide‑left sections directly in the CMS editor.

6/10   Optimizely Blog   Feb 12, 2026

Beware when storing complex types in PropertyList!

Optimizely developers should be cautious about storing complex types in PropertyList properties, as this can negatively impact performance. Check the latest Optimizely blog post for a detailed performance tip and best‑practice guidance.

5/10   Optimizely Blog   Feb 09, 2026

New Packages

Check out our latest NuGet release, Geta.Optimizely.ContentTypeIcons v3.0.0, which automatically generates icons for Episerver content types using FontAwesome 4/5 or custom fonts, simplifying UI customization and eliminating manual icon management. This new tool ensures consistent, up‑to‑date icons whenever you create new content, streamlining your front‑end workflow.

Geta.Optimizely.ContentTypeIcons v3.0.0

Geta.Optimizely.ContentTypeIcons v3.0.0 is a new NuGet release that automatically generates image icons for Episerver content types. It supports FontAwesome 4 and 5 as well as custom icon fonts, allowing developers to have consistent, up‑to‑date icons when creating new content. This streamlines UI customization and removes the need to manually create and manage icon assets.

6/10   Optimizely NuGet   Feb 12, 2026