- **Anthropic server-side compaction** is now enabled on Claude Opus 4.7, Opus 4.6, and Sonnet 4.6. Sofos sends the `compact-2026-01-12` beta header and a `context_management.edits[type=compact_20260112]` block on every request to those models; when the request crosses the per-model auto-compact threshold (~250K tokens), the API itself summarises older turns and returns a `compaction` content block, dropping the pre-compaction messages server-side on subsequent requests. No extra round-trip — the compaction summary arrives in the same response as the user's reply.
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