#llm

Claude Opus 5 API request parameters that now return a 400 error

Claude Opus 5 returns 400 on temperature. What to do

Set temperature=0.7 on Claude Opus 5 and the request fails. The API returns a 400 error, not a warning and not a silently ignored parameter. The same happens with topp, topk, and with the manual

Fri Aug 21 2026 · 6 min read · 25 views

An AI agent's context window filling with stale tool output across a long task

Your AI agent gets worse long before the context fills

Agents degrade as context grows, well before the window is full. Here is the token budget that fixes it, and what each fix costs you in latency.

Thu Aug 20 2026 · 5 min read · 2 views

Upgrading a Python agent codebase from Pydantic AI v1 to v2

Pydantic AI v2 migration: the change that throws no error

The riskiest Pydantic AI v2 migration change raises no exception: openai: model names now hit the Responses API. Here is the safe upgrade path.

Thu Aug 20 2026 · 5 min read · 3 views

Software

An AI agent repeating the same tool call because tool_choice stayed forced

Your agent loops forever. It is probably tool_choice.

Your agent calls the same tool repeatedly and never returns an answer. The advice you will find first is to set maxiterations, which caps your bill without addressing the underlying defect.

Wed Aug 19 2026 · 6 min read · 4 views

AI Software

Illustration for a report on Alibaba's unfulfilled Qwen 3.8 Max open weights promise

Qwen 3.8 Max promised open weights. Where are they?

Alibaba released Qwen 3.8 Max on 3 August 2026. It is a 2.4-trillion-parameter model with a million-token context window, and the company says it sits second only to Fable 5 (Yotta Labs on release and

Thu Aug 06 2026 · 6 min read · 1 views