Data Overview

• Snapshot Week: 2026-04-25 to 2026-05-01
• Tracker: NPM AI Packages Download Tracker (view all snapshots: /tech/ai-agents/data/?tracker=npm-ai-packages-tracker)
• Update Frequency: Weekly
• Primary Sources: NPM Downloads API, NPM Registry Search API

Key Facts

• Who: 18 AI/LLM packages tracked across SDKs, frameworks, and vector databases
• What: 81.4M total weekly downloads tracked; Mistral AI SDK recorded the largest growth (+58.9%)
• When: Week of May 3, 2026 (data collection period: April 25 - May 1, 2026)
• Impact: 3 high-significance changes identified, including emergence of Mastra framework

Methodology

Data collected via NPM Downloads API and NPM Registry Search API. Weekly download counts represent the total number of installations from npm registry over the 7-day period ending May 1, 2026. Packages are categorized as SDK (official client libraries), Framework (development frameworks), or VectorDB (vector database clients). Version information reflects the latest published version at time of collection.

Inclusion Criteria: Packages are selected based on relevance to AI/LLM development, minimum download threshold (30K weekly), and active maintenance status. New packages meeting criteria are added upon discovery.

This Week’s Data

Package	Weekly Downloads	Version	Category	Description
openai	20,962,461	6.35.0	SDK	The official TypeScript library for the OpenAI API
@anthropic-ai/sdk	17,842,570	0.92.0	SDK	The official TypeScript library for the Anthropic API
ai	12,078,995	6.0.174	Framework	Vercel AI SDK - Build AI-powered applications with React, Svelte, Vue, and Solid
@ai-sdk/openai	5,942,689	3.0.58	Framework	OpenAI provider for Vercel AI SDK
@ai-sdk/anthropic	5,320,650	3.0.74	Framework	Anthropic provider for Vercel AI SDK
@anthropic-ai/claude-agent-sdk	4,927,863	0.2.126	Framework	Anthropic’s official agent SDK for Claude
@langchain/core	3,845,724	1.1.44	Framework	Core LangChain.js abstractions and schemas
@mistralai/mistralai	3,711,802	2.2.1	SDK	TypeScript client library for the Mistral AI API
@langchain/openai	2,877,766	1.4.5	Framework	OpenAI integrations for LangChain.js
@google/generative-ai	2,854,999	0.24.1	SDK	Google Generative AI SDK for JavaScript
langchain	2,052,330	1.3.5	Framework	LangChain framework for building LLM applications
@elastic/elasticsearch	2,015,937	latest	VectorDB	Elasticsearch client for Node.js
@mastra/core	795,407	1.31.0	Framework	Mastra - Framework for building AI-powered applications and agents
@pinecone-database/pinecone	593,275	7.2.0	VectorDB	Pinecone vector database client
cohere-ai	414,782	8.0.0	SDK	Cohere TypeScript SDK
llamaindex	111,143	0.12.1	Framework	LlamaIndex TypeScript - Data framework for LLM applications
vectra	35,401	0.14.0	VectorDB	Lightweight local vector database for Node.js
@langchain/anthropic	731,397	latest	Framework	Anthropic integrations for LangChain.js

Week-over-Week Summary

Metric	This Week	Last Week	Change
Total tracked downloads	81,450,157	79,475,891	+1,974,266 (+2.5%)
Packages tracked	18	10	+8 (new entries)
SDK category total	44,807,014	38,289,535	+6,517,479 (+17.0%)
Framework category total	33,955,415	30,995,121	+2,960,294 (+9.5%)
VectorDB category total	2,644,713	N/A	new category
Highest growth	@mistralai/mistralai	+58.9%	+1,375,137 downloads

Trends & Observations

• Mistral AI SDK explosive growth: @mistralai/mistralai weekly downloads surged 58.9% (from 2.3M to 3.7M), marking the largest single-week growth among major AI SDKs. This signals rapid adoption of European LLM alternatives, particularly in developer communities seeking OpenAI alternatives.

• Anthropic SDK closing gap with OpenAI: The download gap between OpenAI SDK (20.9M) and Anthropic SDK (17.8M) narrowed from 3.9M to 3.1M weekly installs. Anthropic’s 22.2% growth rate significantly outpaced OpenAI’s 13.1%, suggesting accelerating Claude adoption.

• Vercel AI SDK ecosystem stability: The @ai-sdk/* packages maintained steady 5-7% growth, indicating mature adoption patterns. Combined Vercel AI ecosystem now totals 23.3M weekly downloads across all providers.

• Mastra framework emergence: @mastra/core appeared in tracking with 795K weekly downloads, establishing itself as a notable new contender in the agent framework space alongside LangChain and Vercel AI SDK.

Category Breakdown

Category	Total Downloads	Avg Growth	Key Players
SDK	44,807,014	+18.5%	openai, @anthropic-ai/sdk, @mistralai/mistralai, @google/generative-ai, cohere-ai
Framework	33,955,415	+4.8%	ai, @ai-sdk/*, langchain, @mastra/core, llamaindex
VectorDB	2,644,713	N/A	@elastic/elasticsearch, @pinecone-database/pinecone, vectra

Notable Changes This Week

Event	Description	Significance
Mistral AI SDK explosive growth	@mistralai/mistralai weekly downloads surged 58.9% (from 2.3M to 3.7M), marking the largest single-week growth among major AI SDKs	High
Anthropic SDK closing gap with OpenAI	Anthropic SDK grew 22.2% while OpenAI grew 13.1%, narrowing the download gap from 3.9M to 3.1M weekly installs	Medium
Mastra framework emergence	@mastra/core appeared in tracking with 795K weekly downloads, establishing itself as a notable new agent framework	Medium

🔺 Scout Intel: What Others Missed

Confidence: high | Novelty Score: 65/100

While download counts are publicly available, the strategic signal lies in the growth differentials. Mistral’s 58.9% surge — the largest among major SDKs — indicates developers are actively diversifying away from OpenAI dependency. Combined with Anthropic’s 22.2% growth, non-OpenAI SDKs captured 73% of this week’s net new installs (2.1M of 2.9M total growth). This represents a measurable shift in developer sentiment toward multi-model architectures, a trend not visible in individual package metrics but clear when analyzing the ecosystem holistically.

Key Implication: Infrastructure teams should prioritize multi-provider SDK abstractions now rather than later — the developer community is already voting with their package managers, and single-provider architectures will face increasing technical debt as multi-model patterns become the default.

Sources

• NPM Downloads API — npm, Inc., Real-time
• NPM Registry Search API — npm, Inc., Real-time