Anthropic's @anthropic-ai/sdk NPM package hit 12.4M weekly downloads as of — 82% of OpenAI's 15.2M. Six weeks ago, that ratio was 47%. The Anthropic SDK nearly doubled its weekly download volume while OpenAI grew 14%, marking the fastest convergence period we've tracked. Meanwhile, Claude Code crossed 8.5M VSCode installs, Windsurf Reddit mentions dropped 25%, and ChatGPT Stack Overflow questions collapsed 55%.
Key Findings
- Anthropic SDK at 82% of OpenAI on NPM: 12.4M weekly vs 15.2M — up from 47% in late February
- Claude Code now #4 VSCode extension: 8.5M installs, behind only Copilot (72.6M), Copilot Chat (69.0M), and TabNine (9.5M)
- Windsurf drops 25% on Reddit: 457 mentions in last 2 weeks, down from 607 — falling from its March peak of 334/week
- ChatGPT SO questions collapse 55%: 9 questions vs 20 in the prior 2-week period
- Cursor holds #1 on Reddit: Stable at 2,050 mentions, just 1% below the prior period
The SDK Race: Anthropic Closes In Fast
The Anthropic SDK's trajectory on NPM is the biggest story in AI developer tooling right now. In late February, it sat at 6.5M weekly downloads — 47% of OpenAI's volume. Six weeks later, it has nearly doubled to 12.4M. OpenAI grew too, but at a much slower pace: from 13.3M to 15.2M (14%).
(NPM weekly, up from 47%)
(#4 overall)
(2-week comparison)
| NPM Package | Weekly Downloads | Monthly Downloads |
|---|---|---|
| openai | 15.2M | 70.5M |
| @anthropic-ai/sdk | 12.4M | 44.8M |
| ai (Vercel) | 9.9M | 43.8M |
| @langchain/core | 3.3M | 15.3M |
| @google/generative-ai | 2.4M | 10.5M |
| langchain | 2.0M | 9.6M |
| @ai-sdk/xai | 1.0M | 4.4M |
| ollama | 438K | 2.0M |
The monthly numbers tell a slightly different story: Anthropic's 44.8M monthly downloads are 64% of OpenAI's 70.5M. The gap between the weekly ratio (82%) and monthly ratio (64%) shows that the most recent acceleration is even sharper than the trailing average suggests.
Vercel's AI SDK — the provider-agnostic abstraction layer — is now the third-largest AI package on NPM at 9.9M weekly. Notably, @ai-sdk/xai (the Grok provider) crossed 1.0M weekly downloads, a quiet signal that xAI is gaining real developer traction.
PyPI: Python Developers Are a Different Story
The NPM convergence hasn't replicated on PyPI. The Anthropic Python SDK sits at 21.2M weekly downloads — 38% of OpenAI's 55.2M. This gap likely reflects the Python ecosystem's deeper integration with OpenAI through LangChain, which alone pulls 53.4M weekly downloads.
| PyPI Package | Weekly Downloads | Monthly Downloads |
|---|---|---|
| openai | 55.2M | 233.6M |
| langchain | 53.4M | 226.4M |
| huggingface-hub | 47.2M | 211.4M |
| transformers | 28.9M | 127.0M |
| anthropic | 21.2M | 86.2M |
| cohere | 7.6M | 27.3M |
| ollama | 2.5M | 10.9M |
| llama-index | 2.4M | 10.3M |
The NPM vs PyPI divergence — 82% on NPM, 38% on PyPI — suggests JavaScript/TypeScript developers are adopting Anthropic's API faster than the Python community. This may reflect Claude Code's influence on the JavaScript ecosystem, or the OpenAI Python SDK's stronger first-mover advantage in ML/AI Python workflows.
VSCode Extensions: Claude Code Cracks the Top 4
Claude Code hit 8.5M VSCode installs as of , making it the fourth most-installed AI coding extension — behind only the Copilot duo and TabNine. It now leads Codeium, Cline, Continue, Amazon Q, and Sourcegraph Cody.
| Rank | Extension | Installs |
|---|---|---|
| 1 | GitHub Copilot | 72.6M |
| 2 | GitHub Copilot Chat | 69.0M |
| 3 | TabNine | 9.5M |
| 4 | Claude Code | 8.5M |
| 5 | Codeium | 3.6M |
| 6 | Cline | 3.5M |
| 7 | Continue | 2.5M |
| 8 | Amazon Q | 1.6M |
| 9 | Roo Code | 1.4M |
| 10 | Sourcegraph Cody | 817K |
The gap between #3 (TabNine, 9.5M) and #4 (Claude Code, 8.5M) is just 1.0M installs. At current growth rates, Claude Code could overtake TabNine within weeks.
Reddit: Cursor Stable at #1, Windsurf Drops 25%
Reddit developer discussions over the past two weeks show a market that's stabilizing at the top but contracting at the edges. Cursor, Claude, ChatGPT, and OpenAI are all flat (within 2% of their prior 2-week period). The real movement is in the mid-tier: Windsurf dropped 25%, Lovable fell 11%, and Replit declined 13%.
| Rank | Tool | Last 2 Weeks | Prior 2 Weeks | Change | Engagement |
|---|---|---|---|---|---|
| 1 | Cursor | 2,050 | 2,075 | -1% | 7,029 (3.4x) |
| 2 | v0 | 1,921 | 1,987 | -3% | 9,187 (4.8x) |
| 3 | Claude | 1,892 | 1,896 | 0% | 2,627 (1.4x) |
| 4 | ChatGPT | 1,886 | 1,884 | 0% | 3,722 (2.0x) |
| 5 | OpenAI | 1,777 | 1,817 | -2% | 11,735 (6.6x) |
| 6 | Lovable | 1,549 | 1,739 | -11% | 14,759 (9.5x) |
| 7 | Anthropic | 1,442 | 1,359 | +6% | 7,179 (5.0x) |
| 8 | GitHub Copilot | 916 | 979 | -6% | 6,088 (6.7x) |
| 9 | Replit | 587 | 678 | -13% | 1,139 (1.9x) |
| 10 | Windsurf | 457 | 607 | -25% | 2,410 (5.3x) |
Note: "Continue" and "Aider" are excluded from the ranking narrative — both match common words in non-English subreddits, inflating counts. Raw data: Continue had 1,987 and Aider had 1,055 mentions.
Windsurf — Fading After March Spike
-25% 2-week Peak: 334/week in mid-MarchWindsurf peaked at 334 mentions in the week of , then dropped to 218 by the week of . The two-week total of 457 is 25% below the prior period's 607. Despite the declining volume, engagement remains strong at 5.3x — suggesting a smaller but more invested user base is still actively discussing it.
Lovable — Engagement King Despite Volume Drop
-11% Mentions 9.5x EngagementLovable's 14,759 total score from 1,549 mentions gives it a 9.5x engagement ratio — the highest of any tracked tool. The drop from 1,739 mentions suggests some cooling, but the posts that do appear are generating more discussion and upvotes than any other tool on Reddit.
Anthropic — Only Major Tool Growing on Reddit
+6% Mentions 5.0x EngagementAnthropic is the only tool in the top 10 that grew its Reddit mention count, rising from 1,359 to 1,442. Combined with the SDK download surge, this is a consistent signal across multiple data sources that Anthropic's developer ecosystem is accelerating.
Stack Overflow: ChatGPT Questions Drop 55%
Stack Overflow activity tells a divergent story. Cursor and Claude are holding steady at the top, while ChatGPT questions fell from 20 to 9 — a 55% collapse that stands out against the otherwise stable picture.
| Tool | Last 2 Weeks | Prior 2 Weeks | Change |
|---|---|---|---|
| Cursor | 25 | 25 | 0% |
| Claude | 22 | 21 | +5% |
| ChatGPT | 9 | 20 | -55% |
| OpenAI | 6 | 9 | -33% |
| GitHub Copilot | 5 | 3 | +67% |
| v0 | 3 | 1 | +200% |
Cursor generating 25 SO questions in 2 weeks confirms its position as the tool developers are building with and running into real integration challenges. Claude at 22 is close behind. The ChatGPT decline from 20 to 9 is noteworthy — fewer developers are asking API integration questions about ChatGPT, which could reflect maturing documentation or shifting adoption.
GitHub: MCP Servers Crosses 83K Stars
The Model Context Protocol ecosystem continues to grow. The modelcontextprotocol/servers repository hit 83,236 stars, placing it in the top 20 tracked repos — above OpenCV (83,834). Ollama at 168,165 stars and LangChain at 132,807 continue to lead among AI frameworks.
What This Data Shows
1. Anthropic's SDK Growth Is No Longer Incremental
Going from 47% to 82% of OpenAI's NPM volume in six weeks isn't gradual convergence — it's a step function. The Anthropic SDK almost doubled its weekly downloads while OpenAI's grew modestly. If this trajectory holds, weekly download parity on NPM is a matter of weeks, not months.
2. JavaScript Developers Are Choosing Differently Than Python Developers
The 82% NPM ratio vs 38% PyPI ratio is a striking divergence. JavaScript/TypeScript developers — who build web apps, serverless functions, and API services — are adopting Claude at nearly the same rate as OpenAI. Python developers, working more in ML/data science pipelines where OpenAI had a multi-year head start, are slower to shift. This matters because the JS ecosystem is where most production API integrations live.
3. The Mid-Tier Tools Are Consolidating
Windsurf (-25%), Lovable (-11%), and Replit (-13%) all declined on Reddit while the top-tier tools held flat. The pattern suggests developer attention is concentrating on fewer tools. Windsurf's decline from its March peak is especially notable — the "Codeium rebrand" buzz appears to have fully faded.
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