Stop sequence doesn't work with gpt-5.1-chat-latest

[Neoony]

Whatever they did with gpt-5.1-chat-latest it makes no sense and does not match their documentation

Issue with reasoning tokens being used when using the "gpt-5.1-chat-latest" model

This is an issue discovered during testing using the recently available gpt-5.1-chat-latest model. The documentation indicates that gpt-5.1-chat-latest does not support reasoning. https://platform.openai.com/docs/models/compare?model=gpt-5.1-chat-latest However, during testing, I confirmed that the reasoning token was used. Used code const openai = new OpenAI({ apiKey: process.env.AIAI_OPENAI_API_KEY }); (async () => { const result = await openai.responses.create({ model: 'gpt-5.1-ch…

Or someone explain what is happening with reasoning with this model, which is not supposed to have reasoning (but its reasoning only)