Which AI API SDKs developers installed in September 2026
· covers September 2026
In September 2026, anthropic had the most-installed first-party AI API SDK at 287,821,054 downloads across PyPI and npm. Installs are not latency — they are the other question a developer asks: is anyone actually using this.
Which AI provider SDKs were installed most?
| Provider | Total | PyPI | npm |
|---|---|---|---|
| anthropic | 287,821,054 | 139,420,518 | 148,400,536 |
| 222,716,094 | 134,063,601 | 88,652,493 | |
| mistral | 49,749,908 | 17,153,099 | 32,596,809 |
| groq | 19,322,426 | 15,971,990 | 3,350,436 |
| cohere | 12,102,849 | 10,352,046 | 1,750,803 |
| voyage | 4,503,695 | 3,574,182 | 929,513 |
| xai | 4,359,747 | 4,359,747 | 0 |
| replicate | 3,459,480 | 1,501,686 | 1,957,794 |
| qwen | 2,539,825 | 2,539,825 | 0 |
| together | 1,878,045 | 1,491,836 | 386,209 |
| cerebras | 1,437,497 | 905,785 | 531,712 |
| fireworks | 1,140,904 | 1,140,888 | 16 |
| ai21 | 1,005,233 | 1,004,840 | 393 |
| typesafe | 540,030 | 540,030 | 0 |
| writer | 246,958 | 224,148 | 22,810 |
| reka | 198,699 | 198,699 | 0 |
| glm | 128,069 | 128,069 | 0 |
| baseten | 2,615 | 2,615 | 0 |
Who grew and who shrank?
| Provider | Was | Now | Change |
|---|---|---|---|
| ai21 | 263,483 | 1,005,233 | +281.5% |
| reka | 112,382 | 198,699 | +76.8% |
| xai | 3,830,283 | 4,359,747 | +13.8% |
| baseten | 2,385 | 2,615 | +9.6% |
| minimax | 1,722 | 1,801 | +4.6% |
| voyage | 4,610,568 | 4,503,695 | -2.3% |
| qwen | 2,639,025 | 2,539,825 | -3.8% |
| anthropic | 307,595,326 | 287,821,054 | -6.4% |
| cerebras | 1,563,396 | 1,437,497 | -8.1% |
| replicate | 3,799,086 | 3,459,480 | -8.9% |
Why is the openai package not in this table?
Because it is the client of a protocol, not of a vendor. Groq, Together, DeepInfra, OpenRouter and most others document their own APIs through it, so its download count measures how far the OpenAI-compatible interface has spread, not how much OpenAI is used. Counting it as one provider’s popularity would be the single easiest way to publish a wrong number here, so it is reported separately and never ranked.
Same series: ← August 2026
Other measurements from the same period
- AI API outages in September 2026: who went down, and who admitted it
- Who changed AI API prices in September 2026
- AI models retired or deprecated in September 2026
This post is a snapshot. The live figures behind it: /adoption · all posts