AI

Claude Sonnet 5 to Sonnet 5.5 migration showing which API changes return errors

Claude Sonnet 5.5 migration: which changes return a 400

Claude Sonnet 5.5 launched on September 28, 2026 at the same price as Claude Sonnet 5, $2 per million input tokens and $10 per million output tokens. Moving to it is not a model-ID swap. Several

Tue Sep 29 2026 · 6 min read · 2 views

AI

OpenAI API models being retired on October 23 with their gpt-5.6 replacements

OpenAI shuts off GPT-4, o1 and o4-mini on October 23

OpenAI shuts off GPT-4, GPT-3.5 Turbo, GPT-4 Turbo, o1, o1-pro, o3-mini, o4-mini and several other models on its API on October 23, 2026. That is 24 days away. Any call that names one of those models

Tue Sep 29 2026 · 6 min read · 11 views

AI

Code editor showing an AI SDK 7 result object with usage tokens aggregated across multiple agent steps

AI SDK 7 Changed usage. Your Token Counts Are Now Wrong

If a project upgraded to AI SDK 7 and its per-request token costs suddenly look higher than before, nothing is actually costing more. result.usage used to report only the final step's tokens. In AI

Tue Sep 29 2026 · 6 min read · 6 views

AI

Developer monitor showing an Anthropic API 400 error for thinking and tool_choice settings beside a code diff

Claude Opus 5.5 returns 400 errors. Here is how to fix it

If your code moves from claude-opus-5 to claude-opus-5-5 and starts returning 400 errors, one of two request fields is the cause. Either thinking is set to disabled, or toolchoice is set to any or

Fri Sep 25 2026 · 8 min read · 88 views

AI

Sora 2 API removed on September 24, 2026 and video API replacements

Sora 2's API is gone. What replaces it?

OpenAI removed the Sora 2 Videos API on Sept 24, 2026 with no successor. Compare per-second prices for Veo 3.1, Kling and self-hosted options.

Thu Sep 24 2026 · 5 min read · 8 views

AI

GPT-6 Astra API pricing before and after the 272,000-token long-context threshold, compared with Claude and Gemini rates

GPT-6 Astra Pricing: The 272K-Token Cost Cliff

GPT-6 Astra API pricing is $10 per million input tokens, but a prompt over 272K tokens reprices the whole request to $20. Here is the real cost, and how it compares.

Sun Sep 06 2026 · 6 min read · 5 views

AI

How MCP tool definitions and tool output consume Claude's context window

Your MCP connector spends context before you type

The advice you have read about MCP context cost is out of date. The old rule was simple. Every tool you connect gets injected up front, so a big connector spends a chunk of the window before you type

Sat Aug 22 2026 · 6 min read · 9 views

AISoftware

Amazon Bedrock prompt caching write and read pricing multipliers

Bedrock cache writes ate 85 percent of one AI bill

Prompt caching is sold as a saving. It can also be the single largest line on an inference invoice, and the failure is quiet, because a cache write succeeds whether or not anything ever reads it back.

Fri Aug 21 2026 · 6 min read · 12 views

AI

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 · 74 views

AI