{"slug": "claude-api-2026-10-21-breaking-changes-devs-must-fix-now", "title": "Claude API 2026-10-21: Breaking Changes Devs Must Fix Now", "summary": "Anthropic's Claude API version 2026-10-21 now rejects the temperature, top_p, and top_k parameters with a 400 error, and Python SDK 2.0 breaks MessageParam constructors, according to byteiota. Two additional breaking changes take effect on November 30, 2026.", "body_md": "Anthropic’s new API version rejects temperature, top_p, and top_k with a 400 error. Python SDK 2.0 breaks MessageParam constructors. Two more changes hit November 30.\n\nThe post \nClaude API 2026-10-21: Breaking Changes Devs Must Fix Now\n appeared first on \nbyteiota\n.", "url": "https://wpnews.pro/news/claude-api-2026-10-21-breaking-changes-devs-must-fix-now", "canonical_source": "https://byteiota.com/claude-api-2026-10-21-breaking-changes-devs-must-fix-now/", "published_at": "2026-11-01 00:11:31+00:00", "updated_at": "2026-11-01 00:49:54.097012+00:00", "lang": "en", "topics": ["artificial-intelligence", "large-language-models", "ai-tools", "developer-tools"], "entities": ["Anthropic", "Claude API", "Python SDK 2.0", "byteiota"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/claude-api-2026-10-21-breaking-changes-devs-must-fix-now", "markdown": "https://wpnews.pro/news/claude-api-2026-10-21-breaking-changes-devs-must-fix-now.md", "text": "https://wpnews.pro/news/claude-api-2026-10-21-breaking-changes-devs-must-fix-now.txt", "jsonld": "https://wpnews.pro/news/claude-api-2026-10-21-breaking-changes-devs-must-fix-now.jsonld"}}