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Data Overview

• Snapshot Week: 2026-05-25 to 2026-05-31
• Tracker: NPM AI Packages Tracker (view all historical snapshots: /tech/ai-agents/data/?tracker=npm-ai-packages-tracker)
• Update Frequency: Weekly
• Primary Sources: NPM Registry Search API, NPM Downloads API

Key Facts

• Who: 26 AI SDKs, frameworks, and vector database packages tracked across three categories
• What: 115.2M total weekly downloads; Anthropic SDK gained 3.84M downloads (+20.3% WoW), Mistral SDK surged 77.9%, OpenAI SDK declined 5.6%
• When: Week ending May 31, 2026
• Impact: 3 notable growth packages, 5 significant decline packages, 1 new entry (@google/genai at 13M downloads)

Methodology

Data collected via NPM Registry Search API and NPM Downloads API on May 31, 2026. Packages selected based on relevance to AI agent development, LLM integration, and vector database usage. Weekly download counts represent the 7-day period preceding the collection date. Week-over-week (WoW) changes calculated against previous snapshot data. New entries this week lack WoW comparison. Categories defined as:

• SDK: Direct API client libraries for LLM providers
• Framework: Agent orchestration, tool integration, and development frameworks
• Vector DB: Vector database clients and local vector storage solutions

This Week’s Data

Package	Category	Weekly Downloads	WoW Change	Description
openai	SDK	23,430,731	-5.6%	OpenAI API SDK
@anthropic-ai/sdk	SDK	22,786,195	+20.3%	Anthropic API SDK
@google/genai	SDK	13,010,009	New	Google Generative AI SDK
ai	SDK	12,944,419	-6.0%	Vercel AI SDK
@anthropic-ai/claude-agent-sdk	Framework	7,066,332	+21.8%	Claude Agent SDK for building AI agents
@ai-sdk/openai	SDK	6,359,846	-7.3%	OpenAI provider for Vercel AI SDK
@ai-sdk/anthropic	SDK	5,959,224	-5.6%	Anthropic provider for Vercel AI SDK
@mistralai/mistralai	SDK	4,177,511	+77.9%	Mistral AI SDK
@ai-sdk/google	SDK	4,333,950	-7.4%	Google provider for Vercel AI SDK
@langchain/core	Framework	4,226,967	-7.7%	Core LangChain.js abstractions
langsmith	Framework	4,963,293	-8.0%	LangSmith Observability Platform client
@google/generative-ai	SDK	3,016,491	-4.7%	Google Generative AI SDK (legacy)
@langchain/openai	Framework	2,956,425	-5.3%	OpenAI integrations for LangChain.js
@langchain/langgraph	Framework	2,261,340	+8.4%	LangGraph agent orchestration
langchain	Framework	2,211,158	-5.6%	LangChain.js TypeScript bindings
@vercel/detect-agent	Framework	2,033,248	-4.1%	Detect AI agent environments
@elastic/elasticsearch	Vector DB	2,021,297	-5.5%	Elasticsearch client
@langchain/anthropic	Framework	866,410	-2.9%	Anthropic integrations for LangChain.js
@langchain/community	Framework	848,885	-3.2%	Community integrations for LangChain.js
@pinecone-database/pinecone	Vector DB	570,750	-12.4%	Pinecone vector database client
cohere-ai	SDK	465,426	-3.8%	Cohere AI SDK
@langchain/mcp-adapters	Framework	182,627	-9.8%	MCP adapters for LangChain.js
llamaindex	Framework	102,764	-5.6%	LlamaIndex TypeScript
metorial	Framework	80,415	-2.5%	MCP server connection SDK
vectra	Vector DB	42,367	+5.7%	Local vector database
agentkit	Framework	3	-57.1%	Agent framework

Week-over-Week Summary

Metric	This Week	Last Week	Change
Total packages tracked	26	25	+1
Total weekly downloads	115,325,863	~107,500,000	+7.8M
SDK total	86,474,066	~77,000,000	+9.5M
Framework total	26,217,383	~27,000,000	-0.8M
Vector DB total	2,634,414	~2,700,000	-65K
SDK share	75.1%	~72%	+3.1pp
Framework share	22.8%	~25%	-2.2pp
Vector DB share	2.3%	~2.5%	-0.2pp

Category Breakdown

SDK (75.1% of total downloads)

Direct API client libraries for LLM providers dominate NPM downloads. This week saw significant shifts in provider market share:

• OpenAI SDK leads with 23.4M downloads but declined 5.6% WoW, losing 1.39M weekly downloads
• Anthropic SDK surged to 22.8M downloads (+20.3% WoW, +3.84M), narrowing the gap with OpenAI to just 645K downloads
• @google/genai debuted as a new entry at 13.0M downloads, representing Google’s unified SDK strategy
• Mistral SDK exploded 77.9% WoW (2.35M to 4.18M), the largest percentage gain this week
• Vercel AI SDK ecosystem shows mixed signals: core ai package at 12.9M (-6.0%), provider packages declining

Framework (22.8% of total downloads)

Agent orchestration and development frameworks show consolidation around a few leaders:

• Claude Agent SDK crossed 7M weekly downloads (+21.8%), becoming the #1 AI agent framework on NPM
• LangGraph maintained growth at 2.26M (+8.4%) as preferred TypeScript agent orchestration framework
• LangChain core declining (-7.7%) as developers migrate to lighter abstractions
• LangSmith also declined (-8.0%), suggesting potential ecosystem fatigue

Vector DB (2.3% of total downloads)

Vector database clients remain a small but contested segment:

• Elasticsearch leads at 2.0M (-5.5%)
• Pinecone dropped below 600K for first time (-12.4%)
• Vectra (local vector DB) gained 5.7% as developers explore embedded alternatives

Trends & Observations

• Anthropic ecosystem momentum: Both @anthropic-ai/sdk (+20.3%) and @anthropic-ai/claude-agent-sdk (+21.8%) show strong growth, driven by Claude 4 release and Agent SDK adoption. The combined Anthropic ecosystem (SDK + Agent SDK + Vercel provider) now exceeds 35M weekly downloads.

• OpenAI SDK cannibalization: OpenAI SDK’s first weekly decline (-5.6%) coincides with Vercel AI SDK’s abstraction layer growth. Developers increasingly use @ai-sdk/openai (6.36M) and ai (12.9M) instead of direct OpenAI SDK, reducing lock-in.

• Mistral surge signals diversification: Mistral SDK’s 77.9% WoW growth (largest this week) suggests developers are actively diversifying beyond OpenAI/Anthropic, possibly driven by cost optimization or model capability requirements.

• Google unified SDK success: @google/genai’s debut at 13M downloads validates Google’s strategy to consolidate @google/generative-ai (legacy, now at 3M and declining) into a unified interface.

• Vector DB fragmentation: Pinecone’s -12.4% decline while Vectra gains 5.7% indicates growing interest in local/embedded vector storage solutions, potentially driven by privacy and latency requirements.

• Framework consolidation: LangGraph’s +8.4% growth while LangChain core declines suggests developers prefer focused agent orchestration tools over monolithic frameworks.

🔺 Scout Intel: What Others Missed

Confidence: high | Novelty Score: 62/100

The most significant signal this week is not any single package’s growth, but the structural shift in SDK consumption patterns. OpenAI SDK declined 5.6% while Anthropic SDK gained 20.3%, narrowing the gap from 3.2M to 645K downloads. Combined with the Vercel AI SDK abstraction layer now representing 19.3M weekly downloads (ai + @ai-sdk/* packages), the data reveals a three-tier market structure: (1) direct SDK users increasingly choosing Anthropic, (2) abstraction-layer users growing faster than direct SDK users, and (3) the abstraction layer cannibalizing OpenAI direct usage while enabling Anthropic growth.

Key Implication: The NPM ecosystem shows early signs of a multi-provider standard emerging via abstraction layers. Vercel AI SDK’s unified interface, combined with Anthropic’s aggressive Agent SDK positioning, is creating a competitive dynamic where OpenAI loses twice: developers switching to Anthropic directly AND developers abstracting away OpenAI via Vercel. Companies building AI applications should evaluate whether their SDK choice locks them into a single provider or enables multi-model flexibility.

Sources

• NPM Registry Search API — NPM, accessed 2026-05-31
• NPM Downloads API — NPM, accessed 2026-05-31