Launch HN: Runtime (YC P26) – Sandboxed coding agents for everyone on a team

Runtime launched open-source sandbox infrastructure for coding agents, supporting Claude Code, Codex, Cursor, Copilot, Gemini, and Devin, with hosted access, a free tier, and pricing based on a flat platform fee plus compute without token markup.

Why it matters: HKR-H/K/R pass: this is not a major-lab launch, but open-source sandboxes, six coding-agent types, and no token markup give teams concrete adoption signals. No usage data or marquee customers keeps it near the featured floor.