# Which AI API SDKs developers installed in September 2026

Published 2026-10-01 · 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 google 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.

Source: https://llmlatency.dev/blog/adoption-2026-09 · CC BY 4.0