OpenAI’s public GitHub activity reached a new high in August 2026, with 3.96 million lines changed - up 119.5% month over month - and 3,543 commits, up 71.4%.
That made August OpenAI’s most active month in the observed period across both measures. OpenAI recorded approximately three times as many lines changed as Anthropic and 27% more commits during the month.
Anthropic also saw a meaningful increase in the size of its public code changes. Lines changed rose 209.4% month over month to 1.32 million, the company’s highest level in the series. However, commit volume declined 13.1% to 2,785, suggesting that August’s activity was concentrated in fewer, larger bundles of changes.
The data indicates that visible product iteration accelerated at both companies, but OpenAI showed the stronger combination of code volume and development cadence. The increase spans public repositories associated with SDKs, developer tools, documentation, and open-source projects.