release: 0.90.0

Author: stainless-app[bot]

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.89.0"
+  ".": "0.90.0"
 }

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.90.0 (2026-04-07)
+
+Full Changelog: [v0.89.0...v0.90.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.89.0...v0.90.0)
+
+### Features
+
+* **api:** Add support for claude-mythos-preview ([fc7ddd8](https://github.com/anthropics/anthropic-sdk-python/commit/fc7ddd8e0296a578f09c7fa2baf00e50d81cf980))
+
+
+### Bug Fixes
+
+* **client:** preserve hardcoded query params when merging with user params ([32d35e0](https://github.com/anthropics/anthropic-sdk-python/commit/32d35e0ae67ab0d076a60d38fa5177b5635e9c0c))
+
 ## 0.89.0 (2026-04-03)
 
 Full Changelog: [v0.88.0...v0.89.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.88.0...v0.89.0)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.89.0"
+version = "0.90.0"
 description = "The official Python library for the anthropic API"
 dynamic = ["readme"]
 license = "MIT"

src/anthropic/_version.py

@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "anthropic"
-__version__ = "0.89.0"  # x-release-please-version
+__version__ = "0.90.0"  # x-release-please-version