New `claude-haiku-5-5` model ID and several internal feature flags, endpoints, and sentenc

EXHIBIT 1906 · URGENT

Oct 7, 2026 18:45 UTC binary @anthropic-ai/claude-code-darwin-arm64

New `claude-haiku-5-5` model ID and several internal feature flags, endpoints, and sentences detected in an Anthropic Claude Code binary update.

READY TO POST:

anthropic's claude code binary got an update, and it looks like a `claude-haiku-5-5` model id might be in the works. also some interesting internal flags.

peeking into the latest @anthropic_ai claude code update: new internal feature flags and endpoints surfaced, plus a reference to a 'claude-haiku-5-5' model. 👀

⚠️ FROM COMPILED BINARY — lower confidence, verify before posting. (May include bundled-dependency strings, not just first-party changes.) @anthropic-ai/claude-code-darwin-arm64 2.1.292 -> 2.1.293: +14237 strings, -12559 strings, 33 interesting [model_id] (4) + /$bunfs/root/claude-code.d.ts-6f0ea913.txt.zst + anthropic.claude-haiku-5-5 + claude-haiku-5-5 + us.anthropic.claude-haiku-5-5 [feature_flag] (13) + (internal ID - do not mention to user. + <${pz}>No completion record was found for them in the previous session. ${k} Task ids in this notification beginning with "${Je}" are internal scan markers, not tasks.</${pz}> + @internal False when the calling agent cannot continue this agent with a follow-up message (it holds no messaging tool); absent means it can. + @internal Running totals of the subagents the Agent tool started this session; see SDKSubagentStats.~ + SDK betas dropped: experimental betas are disabled by your organization's policy + This is a feature-availability control, not a data boundary. Claude Code in a terminal reads the same `~/.claude` folder and is governed only by its own managed settings, not by this key. Claude Code may ignore this allowlist on a device that deploys its own Claude Code managed settings; restrict ma + This runtime has no Bun.ant.CellSegmenter. Run Claude Code on the @anthropic-ai/bun-internal version pinned in package.json. + `, signed out, with no account, organization, or device identifier (Claude admin console installs: as the signed-in member on `api.anthropic.com`). A site it blocks stays blocked to Claude under every key below. Private addresses, names resolving to them, and internal-suffix or single-label names ar + feature_nameG + flag_enabled + internal_command + internal_querierF + tengu_ccr_event_hold_enabled [endpoint] (16) + /api/frame/deploy/direct + /api/frame/perm/ + /api/oauth/organizations/:orgUUID/plugin_ratings/appearances + /api/v2/rum + /v1/claudeai-agent