Anthropic's `claude-code-darwin-arm64` binary update hints at new `claude-sonnet-5-5` and

EXHIBIT 1704 · URGENT

Sep 28, 2026 18:43 UTC binary @anthropic-ai/claude-code-darwin-arm64

Anthropic's `claude-code-darwin-arm64` binary update hints at new `claude-sonnet-5-5` and `claude-opus-4-5-20251101` models, alongside several new internal feature flags and endpoints related to usage and security.

READY TO POST:

looks like anthropic's claude-code binary might be hinting at new models like 'claude-sonnet-5-5' and 'claude-opus-4-5-20251101'. interesting to see what those bring!

anthropic's latest claude-code binary update has some intriguing internal feature flags and endpoints, including new model IDs. could be some big changes coming to claude.

⚠️ FROM COMPILED BINARY — lower confidence, verify before posting. (May include bundled-dependency strings, not just first-party changes.) @anthropic-ai/claude-code-darwin-arm64 2.1.283 -> 2.1.284: +15949 strings, -14672 strings, 46 interesting [model_id] (7) + /$bunfs/root/claude-code.d.ts-c417f0db.txt.zst + ^claude-0 + anthropic.claude-sonnet-5-5 + claude-opus-4-5-20251101 + claude-sonnet-5-5 + claude-sonnet-5-5[1m] + us.anthropic.claude-sonnet-5-5 [feature_flag] (21) + $.internal error: entered unreachable code==<<=>>=TryFromIntErrorHash table capacity overflowmid > lenint castcast_slice_mutcast_sliceunreachableinternal error: entered unreachable code: AutoBitSet::set_union: mismatched bit lengthsinternal error: entered unreachable code: AutoBitSet::subset_of: mis + ${t?E:"Every message you send is to the user."} Worker results and system notifications are internal signals, not conversation partners \u2014 never thank or acknowledge them. Summarize new information for the user as it arrives. + <${q2}>No completion record was found for them in the previous session. ${h} Task ids in this notification beginning with "${He}" are internal scan markers, not tasks.</${q2}> + @internal How the report reached this result when the subagent reports through the SubagentHandback tool: 'send' = delivered, passed by auto mode's review or with a note that the review could not run; 'flagged' = delivered under a SECURITY WARNING; 'withheld' = nothing was delivered + @internal Present ('session-task') when the notification reports on work this session itself launched: a background agent, shell command, workflow, monitor, MCP or remote task settling, a detached tool call, or a hook rewake or worker check-in following up on such work. Absent on webhook, artifact a + @internal Result of a submit_feedback request. feedback_id is set on success (a sent report, or a bundle written to bundle_path); otherwise one of unavailable_reason / failure_reason explains