LangChain / LlamaIndex
Tutorials and changelogs for LangChain, LlamaIndex, and the orchestration ecosystem.
Officially obsolete: the base_url trick for OpenRouter
0.2.4 adds parallel_tool_calls, pins openrouter SDK 0.9.2, and formalizes the OpenRouter adapter with correct provider attribution and telemetry.
SimpleMultiModalQueryEngine is deprecated. Here's the swap.
LlamaIndex 0.14.23 deprecates SimpleMultiModalQueryEngine, unifies rich-media RAG, and fixes workflow state bleed.
What v3 event stream was silently losing — LangChain 1.4.8
langchain-core 1.4.8 + 1.3.10 (June 18): v3 metering gaps, BaseTool schema caching, and gpt-5.x routing correction.
langchain-model-profiles writes _profiles.py, not profiles.py
LangChain's capability metadata CLI for 0.0.6: refresh cycle, field mapping, and the _profiles.py naming inconsistency.
23 schemas, 33 ms each. LangChain just memoized them.
June 18: v3 cost attribution restored, schemas 100× faster, multimodal summarizer fixed. Repin away from yanked 1.3.5.
What langchain-fireworks 1.4.x Changed for Your Code
What the 1.4.x patch sequence changed — and a runnable ChatFireworks setup from scratch.
Why langchain-perplexity 1.3.1 Dropped Its SSE Shim
1.3.0 added use_responses_api for Perplexity's Responses endpoint; 1.3.1 removed the SSE shim 0.34.0 required.
ChatPerplexity Auto-Routes to Real-Time Search in LangChain
ChatPerplexity gains use_responses_api in 1.3.0: auto-routes to Perplexity's Agent API for real-time search.
ChatPerplexity 1.3.0, 실시간 검색 자동 라우팅이 된다
ChatPerplexity gains use_responses_api in 1.3.0: auto-routes to Perplexity's Agent API for real-time search.
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