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Public story · 2026-08-25 · high
Version 2.1.243 also trims 40 to 70MB of memory per session by loading code on demand, not keeping it resident.
Why now: The cut shipped in 2.1.243, with a follow-up fix in 2.1.245 covering a startup crash on newer glibc builds.
Claude Code's 2.1.243 release cuts the native Linux binary from about 340MB to roughly 75MB, per the changelog. None of this changes what Claude Code does. It changes what running it costs, in disk, memory, and startup time.
The binary also sheds 40 to 70MB of memory per session. Compressing the install and update payload with zstd, plus packing bundled skill and prompt text more compactly, trimmed the binary itself by another 2MB. Code now loads on demand instead of staying resident in memory, and the runtime garbage-collects sooner as sessions run long. Startup no longer blocks the first frame on sandbox and MCP bring-up.
A companion release, 2.1.245, followed to fix a startup crash on glibc 2.44 distributions, naming Arch, CachyOS, and Fedora Rawhide. That's a narrow list. If you're not running a rolling-release distro on bleeding-edge glibc, the crash likely never touched you. But cutting a binary this much also touched enough of the startup path to open a new failure mode on the way out.
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Claude uses MCP / Shared entities / Same source / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude uses MCP); both cover Claude Code, MCP; cite the same source (changelog).
Linked by a graph relationship (Claude uses MCP); both cover Claude Code, MCP; cite the same source (changelog).
Claude Code uses MCP / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code uses MCP); both cover Claude Code, MCP; cite the same source (changelog).
Linked by a graph relationship (Claude Code uses MCP); both cover Claude Code, MCP; cite the same source (changelog).
Claude uses MCP / Shared entity: Claude Code / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude uses MCP); both cover Claude Code; cite the same source (changelog).
Claude Code uses MCP / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code uses MCP); both cover Claude Code, MCP; cite the same source (changelog).
Anthropic released MCP / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released MCP); both cover Claude Code, MCP; cite the same source (changelog).
Claude Code uses MCP / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude Code uses MCP); both cover Claude Code, MCP; cite the same source (changelog).