As of mid-September 2026, the three leading agent frameworks have settled into specialization rather than converging toward one winner. Version numbers: LangGraph reached 1.0 general availability in October 2025 and has since climbed to v1.0.10; CrewAI crossed 44,600 GitHub stars and shipped v1.10.1 with native MCP and A2A protocol support; Google's ADK is at v1.26.0. Architecturally they've stayed distinct too -- ADK uses hierarchical agent trees, LangGraph uses directed graphs with conditional edges, CrewAI uses role-based crews with configurable process types.
LangGraph is the most battle-tested in actual production: Klarna reportedly runs it at 85 million users, and benchmarks show roughly 47% lower token costs than CrewAI, attributed to LangGraph's explicit edge transitions replacing CrewAI's LLM-driven task routing. It owns complex, stateful orchestration, with the strongest persistence and checkpointing story of the three for workflows with heavy branching.
CrewAI owns the fastest path from zero to a working multi-agent prototype -- a role-based DSL that gets a first crew running in roughly 20 lines -- plus the largest community and, as of v1.10.1, native support for both MCP and A2A, giving it the broadest cross-framework protocol reach of the three.
Google ADK wins on deployment speed for teams already inside Google Cloud, and on multimodal agent workflows specifically, backed by the same infrastructure Google runs internally rather than a separately-maintained open-source stack.
Read plainly: pick by workload shape, not by which framework is loudest this month. Complex, stateful, heavily-branching production systems still point at LangGraph; fast multi-agent prototyping with broad protocol support points at CrewAI; Google Cloud-native multimodal deployment points at ADK.
First edition of a new weekly format: instead of daily framework news (which is often too incremental to be worth a standalone entry), Framework Watch tracks what's actually different week over week across ADK, LangGraph and CrewAI -- this week, the story is specialization, not a leader.