gptel-anthropic: Add support for Claude Opus 4.1

* gptel-anthropic.el (gptel--anthropic-models): Add
claude-opus-4-1-20250805 to the list of Anthropic models.

* NEWS: Document change.

Author: karthink

NEWS

@@ -23,6 +23,8 @@
 
 ** New models and backends
 
+- Add support for ~claude-opus-4-1-20250805~.
+
 - Add support for ~gemini-2.5-pro~, ~gemini-2.5-flash~,
   ~gemini-2.5-flash-lite-preview-06-17~.
 

gptel-anthropic.el

@@ -536,14 +536,22 @@ files in the context."
      :input-cost 3
      :output-cost 15
      :cutoff-date "2025-03")
-    (claude-opus-4-20250514
+    (claude-opus-4-1-20250805
      :description "Most capable model for complex reasoning and advanced coding"
      :capabilities (media tool-use cache)
      :mime-types ("image/jpeg" "image/png" "image/gif" "image/webp" "application/pdf")
      :context-window 200
      :input-cost 15
      :output-cost 75
      :cutoff-date "2025-03")
+    (claude-opus-4-20250514
+     :description "Anthropic's previous flagship model"
+     :capabilities (media tool-use cache)
+     :mime-types ("image/jpeg" "image/png" "image/gif" "image/webp" "application/pdf")
+     :context-window 200
+     :input-cost 15
+     :output-cost 75
+     :cutoff-date "2025-03")
     (claude-3-5-sonnet-20241022
      :description "Highest level of intelligence and capability"
      :capabilities (media tool-use cache)