Compare AI tools

	OpenRouter S	GitNexus A	Perplexity S	Gemini A
Tagline	One API, every model. Pay-as-you-go, no subscriptions.	An open-source, MCP-native knowledge graph engine that gives AI coding agents (Cursor, Claude Code, Windsurf) genuine structural awareness of your codebase before they touch a single line.	AI search done right. Cited answers, not chat theater.	Google's answer. Best integrated with Workspace + free for a lot.
Category	Dev Platform	Coding	Research	Chatbots
Pricing	Pay per token — model-dependent	Free (MIT open source)	Free + $20/mo Pro	Free + $20/mo Advanced (bundled with 2TB Drive)
Best for	Developers experimenting across models. Apps that want fallback logic.	Developers working in large or unfamiliar codebases who want their AI coding agent to stop making confident, structurally blind edits — especially Claude Code power users.	Replacing Google for any question where you want a cited answer in seconds.	Anyone already on Google, research tasks, summarizing long documents.
Strengths	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use	Pre-computes a full dependency graph (functions, imports, class inheritance, execution flows) via Tree-sitter ASTs — agents query structure, they don't guess at it Zero-server, privacy-first: CLI runs entirely locally with no network calls; browser UI processes code client-side and never uploads it Deepest Claude Code integration on the market: MCP tools + agent skills + PreToolUse/PostToolUse hooks that auto-enrich searches and auto-reindex after commits One global MCP server handles multiple indexed repos — set up once with npx gitnexus setup and forget it detect_impact and generate_map MCP prompts give pre-commit blast-radius analysis and auto-generated Mermaid architecture docs	Sources every claim Fast, current answers Pro Search runs multi-step research Spaces for persistent context	Native Google Workspace integration Very long context (1M+) Deep Research feature Free tier is generous
Weaknesses	Slight markup over direct API Some provider features not exposed	Browser-side RAG has hard ceilings: WASM heap limits constrain embedding model quality compared to server-side tools; monorepos or repos >50k files hit practical walls Community-built and not officially maintained — velocity and long-term support depend on contributor goodwill Claude Code gets the full integration experience; other editors (Windsurf, Cursor) get progressively less — value is uneven depending on your editor	Not a general chatbot Answers can be shallow on complex topics	Writing quality trails Claude Over-refusals on edge content UI is cluttered
Kai's verdict	S-tier for model-shopping. I use this for every prototype before committing.	GitNexus solves a real and underappreciated problem: AI coding agents are syntactically fluent but architecturally blind, and plugging a pre-computed knowledge graph into the MCP layer is the right fix. 28k GitHub stars in days suggests the pain is widely felt — just go in knowing it's a community project, not a polished product. (Verdict pending Phi's full review.)	S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.	A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.
Link	Open →	Open →	Open →	Open →