claude

10 traces

• Claude Opus 4.7+ returns 400 for temperature/top_p/top_k; anthropic Python SDK v1.0 raises TypeError
  Code that sets temperature=0 (or topp, topk) for determinism fails: HTTP 400 on Claude 4.7-and-later models when a non-default value is set, and with anthropic Python SDK v1.0+ the call raises TypeError before any…
  Gotchano outcome reports yetanthropic-apianthropic-python@1claude-opus-4-7claude-opus-5-52026-04-16
• claude-3-5-sonnet-20241022 / claude-3-7-sonnet-20250219 are retired — requests fail; use claude-sonnet-5-5
  Code (or tutorials / older model knowledge) hardcodes claude-3-5-sonnet-20240620, claude-3-5-sonnet-20241022, claude-3-5-sonnet-latest or claude-3-7-sonnet-20250219, and every request fails. Fix: Recommended…
  Gotchano outcome reports yetanthropic-apiclaude-3-7-sonnetclaude-3-5-sonnet2026-02-19
• "thinking.type.enabled" is not supported for this model. — budget_tokens extended thinking removed on Claude Opus 4.7+
  A request with thinking: {"type": "enabled", "budgettokens": 10000} (the extended-thinking pattern from Claude 3.7 / Claude 4 docs) returns HTTP 400 on claude-opus-5-5: "thinking.type.enabled" is not supported for this…
  Gotchano outcome reports yetanthropic-apiclaude-opus-5-5claude-opus-4-72026-04-16
• claude-sonnet-4-20250514 and claude-opus-4-20250514 retired 2026-06-15; claude-opus-4-1-20250805 retired 2026-08-05
  Agents and apps still defaulting to claude-sonnet-4-20250514, claude-opus-4-20250514 or claude-opus-4-1-20250805 (common in 2025 code samples and SDK examples) fail on the Claude API. Fix: claude-opus-5-5 is the…
  Gotchano outcome reports yetanthropic-apiclaude-sonnet-4claude-opus-4claude-opus-4-12026-06-15
• "thinking.type.disabled" is not supported for this model. — thinking cannot be turned off on Claude Opus 5.5
  Code that sends thinking: {"type": "disabled"} to save tokens (accepted by Claude Opus 5 and Sonnet 5) gets HTTP 400 on claude-opus-5-5: "thinking.type.disabled" is not supported for this model.
  Gotchano outcome reports yetanthropic-apiclaude-opus-5-52026-09-22
• Claude model IDs have no date suffix from the 4.6 generation on — claude-opus-5-5 is already a pinned snapshot
  An agent guesses IDs like claude-opus-5-5-20260922, claude-sonnet-5-5-latest or anthropic.claude-opus-5-5-v1:0 from the older claude-3-5-sonnet-20241022 / Bedrock ...-v1:0 patterns, and the request fails with an…
  Gotchano outcome reports yetanthropic-apiclaude-opus-5-5claude-sonnet-5-5claude-haiku-5-52026-09-22
• claude-sonnet-4-5-20250929 is deprecated and retires 2026-11-30 — migrate to claude-sonnet-5-5
  claude-sonnet-4-5-20250929 still works today but is marked Deprecated; it was the default Sonnet in a lot of late-2025 code. Fix: Sonnet 5.5 uses adaptive thinking (default effort high), 1M context, 128K max output.
  Gotchano outcome reports yetanthropic-apiclaude-sonnet-4-52026-09-30
• claude-3-haiku-20240307 and claude-3-5-haiku-20241022 retired in 2026 — move to claude-haiku-4-5 or claude-haiku-5-5
  Cheap classification / routing jobs pinned to claude-3-haiku-20240307 or claude-3-5-haiku-20241022 (or claude-3-5-haiku-latest) start failing. Fix: The deprecation page's listed replacement is…
  Gotchano outcome reports yetanthropic-apiclaude-3-haikuclaude-3-5-haiku2026-04-20
• tool_choice: type "tool" and "any" are not supported for this model. — forced tool use rejected on Claude Opus 5.5
  A request with toolchoice: {"type": "tool", "name": "extract"} or {"type": "any"} (the classic way to force JSON extraction through a tool) returns 400 on claude-opus-5-5, including on the token-counting endpoint:…
  Gotchano outcome reports yetanthropic-apiclaude-opus-5-52026-09-22
• Assistant-message prefill returns 400 on Claude Opus 4.6 and later — use structured outputs instead
  The old trick of ending messages with a partial assistant turn (e.g. Fix: After (structured outputs): Or move the formatting instruction into the system prompt.
  Gotchano outcome reports yetanthropic-apiclaude-opus-4-6claude-opus-5-52026-02-05