diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index d360995e..db00049a 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -9,6 +9,8 @@
 - Fixed `redacted_thinking` blocks being silently dropped during Anthropic streaming. They are now captured as `ThinkingContent` with `redacted: true`, passed back to the API in multi-turn conversations, and handled in cross-model message transformation ([#1665](https://github.com/badlogic/pi-mono/pull/1665) by [@tctev](https://github.com/tctev))
 - Fixed `interleaved-thinking-2025-05-14` beta header being sent for adaptive thinking models (Opus 4.6, Sonnet 4.6) where the header is deprecated or redundant ([#1665](https://github.com/badlogic/pi-mono/pull/1665) by [@tctev](https://github.com/tctev))
 - Fixed temperature being sent alongside extended thinking, which is incompatible with both adaptive and budget-based thinking modes ([#1665](https://github.com/badlogic/pi-mono/pull/1665) by [@tctev](https://github.com/tctev))
+- Fixed `(external, cli)` user-agent flag causing 401 errors on Anthropic setup-token endpoint ([#1677](https://github.com/badlogic/pi-mono/pull/1677) by [@LazerLance777](https://github.com/LazerLance777))
+- Fixed crash when OpenAI-compatible provider returns a chunk with no `choices` array by adding optional chaining ([#1671](https://github.com/badlogic/pi-mono/issues/1671))
 
 ## [0.55.1] - 2026-02-26
 
diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 5fe118e9..9bbcbf50 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## [Unreleased]
 
+### New Features
+
+- Extensions can dynamically remove custom providers via `pi.unregisterProvider(name)`, restoring any built-in models that were overridden, without requiring `/reload` ([docs](https://github.com/badlogic/pi-mono/blob/main/packages/coding-agent/docs/custom-provider.md)).
+- `pi.registerProvider()` now takes effect immediately when called outside the initial extension load phase (e.g. from a command handler), removing the need for `/reload` after late registrations.
+
 ### Added
 
 - `pi.unregisterProvider(name)` removes a dynamically registered provider and its models from the registry without requiring `/reload`. Built-in models that were overridden by the provider are restored ([#1669](https://github.com/badlogic/pi-mono/pull/1669) by [@aliou](https://github.com/aliou)).
@@ -10,6 +15,11 @@
 
 - `pi.registerProvider()` now takes effect immediately when called after the initial extension load phase (e.g. from a command handler). Previously the registration sat in a pending queue that was never flushed until the next `/reload` ([#1669](https://github.com/badlogic/pi-mono/pull/1669) by [@aliou](https://github.com/aliou)).
 - Fixed duplicate session headers when forking from a point before any assistant message. `createBranchedSession` now defers file creation to `_persist()` when the branched path has no assistant message, matching the `newSession()` contract ([#1672](https://github.com/badlogic/pi-mono/pull/1672) by [@w-winter](https://github.com/w-winter)).
+- Fixed SIGINT being delivered to pi while the process is suspended (e.g. via `ctrl+z`), which could corrupt terminal state on resume ([#1668](https://github.com/badlogic/pi-mono/pull/1668) by [@aliou](https://github.com/aliou)).
+- Fixed Z.ai thinking control using wrong parameter name, causing thinking to always be enabled and wasting tokens/latency ([#1674](https://github.com/badlogic/pi-mono/pull/1674) by [@okuyam2y](https://github.com/okuyam2y))
+- Fixed `redacted_thinking` blocks being silently dropped during Anthropic streaming, and related issues with interleaved-thinking beta headers and temperature being sent alongside extended thinking ([#1665](https://github.com/badlogic/pi-mono/pull/1665) by [@tctev](https://github.com/tctev))
+- Fixed `(external, cli)` user-agent flag causing 401 errors on Anthropic setup-token endpoint ([#1677](https://github.com/badlogic/pi-mono/pull/1677) by [@LazerLance777](https://github.com/LazerLance777))
+- Fixed crash when OpenAI-compatible provider returns a chunk with no `choices` array ([#1671](https://github.com/badlogic/pi-mono/issues/1671))
 
 ## [0.55.1] - 2026-02-26