{"version":"2.1.280","anchor":"new-model-capability-gate-tied-to-opus-5-5-prompt-bundle","canonical_anchor":"new-model-capability-gate-tied-to-opus-5-5-prompt-bundle","heading":"New Opus 5.5 prompt bundle and capability gate","tier":"internal","area":"Models","url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280\/e\/new-model-capability-gate-tied-to-opus-5-5-prompt-bundle","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280","markdown":"### New Opus 5.5 prompt bundle and capability gate\n\nOpus 5.5 gets its own tailored system prompt bundle, gated by a new opus_5_5_prompt_bundle capability check\n\n**What**\n\n- A new named prompt bundle, `opus_5_5_prompt_bundle`, was added alongside the existing `opus_5_prompt_bundle` and `fable_5_1_prompt_bundle` entries, giving Opus 5.5 its own tailored system prompt bundle.\n\n- A capability-check set (including `silent_turn_reminder` and `quizzical_shore`) now also returns true when the `opus_5_5_prompt_bundle` remote-config flag is enabled (and a separate condition is false), so this capability turns on when the new bundle is active.\n\n**Why**\n\nThis lets Claude Code apply Opus-5.5-specific prompt behavior in a controlled way, tied to a remote-config flag rather than being always on.\n\n- Flag `tengu_tool_pear`: Off in both readings (read for one account on one subscription tier against v2.1.280; this account: off, anonymous baseline: off, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Area: Models\n- Names: `opus_5_5_prompt_bundle`\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 2\/5"}