Sider Integrates Multiple LLMs into Browser Sidebar
Sider, a Boston-based startup, delivers an AI sidebar extension for Chrome and Edge that embeds ChatGPT and other large language models directly into the browser. The April 21, 2026 release (Chrome 5.25.12, Edge 5.25.4-e) foregrounds in-context assistance: document querying, PDF analysis, meeting summarization, note clipping, and side-by-side AI comparisons. The extension supports multiple backends including GPT-5.2, Gemini 3 Pro, and Claude Sonnet 4.5, enables group chat across models, and syncs chats across devices. The Edge store lists 3,000,000+ users. Softpedia notes Sider uses the ChatGPT Premium API with limited daily queries for some features. For practitioners, Sider is a practical productivity layer that centralizes multi-LLM access and source-grounded document search inside the browser.
What happened
Sider, the Boston-based startup behind an AI sidebar extension, published updates on April 21, 2026 with Chrome 5.25.12 and Edge 5.25.4-e. The extension embeds ChatGPT and many other LLMs directly into the browser UI, offers chat sync across devices, and advertises 3,000,000+ Edge users. Softpedia notes that Sider can use the ChatGPT Premium API for certain features, with limited daily queries.
Key Points
- 1Sider centralizes multiple LLM backends in a browser sidebar, enabling instant model comparisons and multi-agent group chats for faster iteration.
- 2Integration features like PDF search, meeting summaries, and clip-to-knowledgebase reduce friction for information-heavy workflows across research and product teams.
- 3Reliance on third-party APIs, including the ChatGPT Premium API with limited daily queries, shapes cost, latency, and data governance trade-offs for enterprises.
Scoring Rationale
Sider is a widely adopted productivity extension that aggregates many LLMs and useful document features, making it practically relevant for practitioners. The story is product-focused rather than a frontier research breakthrough, so it scores as notable but not industry-shaking. Freshness today reduces the baseline adjustment slightly.
Sources
Public references used for this report.
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