diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,9 +3,11 @@
 
 ## [Unreleased]
 
+## [v0.51.492] — 2026-06-18 — Release RB (large context window preserved on session reload)
+
 ### Fixed
 
-- **Reloading a session with a large model context window no longer snaps it back to the 256k fallback (#4248).** The session reload path now resolves context-window metadata with the same base URL / API-key lookup inputs used by streaming saves, and it refuses to overwrite a larger persisted context window with the generic 256k fallback.
+- **Reloading a session with a large model context window no longer snaps it back to the 256k fallback (#4248).** The session reload path now resolves context-window metadata with the same base URL / API-key lookup inputs used by streaming saves, and it refuses to overwrite a larger persisted context window with the generic 256k fallback. The reload model-identity check also normalizes slash-qualified model ids (`provider/model`, OpenRouter-style) so a slash-stored model resolving to its bare id is not mistaken for a model change. Thanks @franksong2702.
 
 ## [v0.51.489] — 2026-06-18 — Release QY (outline button no longer collides with the scroll control)