Brief Bear vs Sider

SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.

SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.

Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.

One AI assistant that plugs ChatGPT, Claude and Gemini into every tab

Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.

Highlight the web, learn in public, and build your AI clone

Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.

Free AI Summarizer for text, articles, URLs and images

Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser

Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.

Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.

One AI sidebar for ChatGPT, Claude and Gemini across the web