alt Hacker NewsI've been sticking with the chat completion endpoint because of this same behavior. OAI has been subtly pushing users away from chat completion and toward the endpoints that are possible to obfuscate (responses API).
With chat completion, the reasoning process is entirely under your control. You can build a reasoning agent that uses custom MCTS techniques with GPT5.6 models today if you are willing to get your hands just a little bit dirty. You have to enable experimental flags and set options in slightly confusing ways, but it still works.
You can use models up to gpt5.5 with custom API tokens and model configuration in VS Copilot. gpt5.6 family (currently) no longer work in this setup. Presumably, because we aren't explicitly forcing reasoning_effort to none to satisfy the new moat expansion behavior.
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Definition provided below for others like myself who abhor acronyms:
MCTS -> Monte Carlo Tree Search
Can you not abuse “mcts” as a buzzword like this
The thing you’re gesturing at isn’t mcts in any real sense
responses api provided many benefits over chat completions https://developers.openai.com/api/docs/guides/migrate-to-res.... Any reasoning model which is all the new models these days should use responses as per the recommendation
> MCTS techniques
what does that mean?
> the reasoning process is entirely under your control
you're still dealing with summarised thinking, no, which is kinda useless as it's way too high level?