Kimi K3 Lands in GitHub Copilot and GitHub Spark Retires August 31

Two GitHub developer platform changes this week: a strong open-weight model joins Copilot's roster, and GitHub's AI web-app builder reaches end of life August 31.

Kimi K3 now GA in GitHub Copilot (Aug 6). Moonshot AI's Kimi K3 — an open-weight model with frontier-level agentic coding scores — is available for Copilot Pro, Pro+, Max, Business, and Enterprise. Pricing: $3/M input, $15/M output, $0.30/M cached, hosted on Fireworks AI. Copilot Business and Enterprise have it off by default — admins must enable Kimi K3 in Copilot settings before anyone on the team can select it. (The rollout briefly paused due to a GitHub Actions incident but resumed the same week.)

GitHub Spark retires August 31. The AI-powered web app prototyping tool stopped accepting new users and apps on August 4 and shuts down fully August 31. GitHub's position: agentic development tools have advanced to the point where developers can build the same things in Copilot's native workflow — VS Code, Copilot CLI, or the Copilot desktop app. Action before deadline: open your Spark workbench → … → Create repository to export your app code. If your app uses llm(), swap in your own inference provider before shutdown or the AI features stop working.

Why it matters: Kimi K3 gives teams a cost-effective open-weight option for long agentic sessions without leaving their Copilot subscription. Spark's retirement is the clearest signal yet that standalone AI-assisted low-code builders are being absorbed into general-purpose coding agents.

Sources: Kimi K3 is now available in GitHub Copilot — GitHub Changelog · Upcoming deprecation of GitHub Spark — GitHub Changelog