Anthropic's native binary for Claude Code on macOS ARM64 was updated, adding references to

EXHIBIT 1789 · URGENT

Oct 1, 2026 18:44 UTC binary @anthropic-ai/claude-code-darwin-arm64

Anthropic's native binary for Claude Code on macOS ARM64 was updated, adding references to a new 'claude-sonnet-5-5' model with 1M context, new API endpoints, and several internal feature flags related to worker interactions and cloud sessions.

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anthropic's claude code binary has strings for a 'claude-sonnet-5-5' model with 1m context. 👀 could this be a new sonnet update coming soon?

looks like anthropic is working on more internal features for claude code, with new api endpoints and flags for 'multi-turn ask' and worker interactions. dev productivity gains maybe?

⚠️ FROM COMPILED BINARY — lower confidence, verify before posting. (May include bundled-dependency strings, not just first-party changes.) @anthropic-ai/claude-code-darwin-arm64 2.1.286 -> 2.1.287: +15624 strings, -11881 strings, 35 interesting [model_id] (3) + - Added Claude Sonnet 5.5 (\`claude-sonnet-5-5\`), now the default Sonnet model on the Anthropic API \u2014 1M context, $2/$10 per Mtok with $0.20/Mtok cache reads + /$bunfs/root/claude-code.d.ts-e37ccc4a.txt.zst + claude-sonnet-4(?!-\d(?!\d))G [feature_flag] (24) + ${k} Worker results and system notifications are internal signals, not conversation partners \u2014 never thank or acknowledge them. Summarize new information for the user as it arrives. + - [Cloud sessions] Fixed Run now on a routine showing internal error text when the run is refused before it starts; it now shows the same explanation as the routine's failure notification + // -- Bytes. What a plugin hands a web API is worked HERE, by internal slots + <${yW}>No completion record was found for them in the previous session. ${h} Task ids in this notification beginning with "${ze}" are internal scan markers, not tasks.</${yW}> + @internal Policy-list sentinel for the built-in Directory marketplace. In strictKnownMarketplaces: allow it (by default any allowlist blocks it). In blockedMarketplaces: block it without otherwise restricting marketplaces. Only meaningful in those two managed-settings lists; it cannot be added or de + @internal Present, and true, only on a worker that takes a stage_file control request whose mount_path is /uploads/.home/<path> as a file for /home/claude/<path>: it writes the file there, answers ok with a noop (already_present, path_occupied, refused_name, home_files_off) and writes nothing, or an + @internal Present, and true, only when this worker uses the file_names member of a turn_handoff request; a client sends that member to no other worker. + @internal Runs at the hook author's explicit reque