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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

One change

Count tokens in a Message

api/beta/messages/count_tokens

first seen The page's own history The capture it came from

Nearest release: v2.1.247, published under an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

api/beta/messages/count_tokens Changed · +21 / -3 lines

from line 16
 
   - `string`
 
-  - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 31 more`
+  - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
 
     - `"message-batches-2024-09-24"`
from line 86
 
     - `"mid-conversation-tool-changes-2026-07-01"`
 
+    - `"compact-2026-01-12"`
+
+    - `"computer-use-2025-11-24"`
+
+    - `"mcp-tunnels-2026-06-22"`
+
+    - `"structured-outputs-2025-11-13"`
+
+    - `"task-budgets-2026-03-13"`
+
+    - `"thinking-display-updates-2026-08-18"`
+
+    - `"ce-user-management-2026-07-13"`
+
 - `"anthropic-user-profile-id": optional string`
 
   The user profile ID to attribute this request to. Use when acting on behalf of a party other than your organization. Requires the `user-profiles` beta header.
from line 1704
 
     - `type: "enabled"`
 
-    - `display: optional "summarized" or "omitted" or null`
+    - `display: optional "summarized" or "omitted" or "updates" or null`
 
       Controls how thinking content appears in the response. When set to `summarized`, thinking is returned normally. When set to `omitted`, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to `summarized`.
from line 1712
 
       - `"omitted"`
 
+      - `"updates"`
+
   - `BetaThinkingConfigDisabled object`
 
     - `type: "disabled"`
from line 1722
 
     - `type: "adaptive"`
 
-    - `display: optional "summarized" or "omitted" or null`
+    - `display: optional "summarized" or "omitted" or "updates" or null`
 
       Controls how thinking content appears in the response. When set to `summarized`, thinking is returned normally. When set to `omitted`, thinking content is redacted but a signature is returned for multi-turn continuity. Defaults to `summarized`.
from line 1729
       - `"summarized"`
 
       - `"omitted"`
+
+      - `"updates"`
 
 - `tool_choice: optional BetaToolChoice`