"GPT-5.4 Thinking is available for the programming Codex tool, the API, and for paid ChatGPT plans. For this article, I used the $20-per-month ChatGPT Plus plan to put it through its paces. That presented me with a bit of a challenge. Normally, when I test a ChatGPT version, I run it through a series of mixed tests. Some are quick, and some are a bit more detailed."
"But this Thinking model required deeper dives, with more comprehensive challenges. As such, not only are the prompts more involved, but the responses are far too extensive to include in the article. Instead, I'm providing links into each test session. When you follow the links, you'll be able to see the entire response in depth."
"GPT-5.4 Thinking delivers deeper analysis than earlier ChatGPT models. It has strong reasoning, but it sometimes answers questions you didn't ask. Formatting and image generation lag behind the text quality."
OpenAI released GPT-5.4 Thinking, a significant advancement designed for complex reasoning tasks rather than a standard incremental update. Available through ChatGPT Plus, Codex, and API, this model demonstrates substantially improved text-based responses and analytical capabilities. Testing revealed strong performance on comprehensive challenges, though the model occasionally answers questions beyond what was asked. The extensive nature of responses required deeper evaluation methods than typical ChatGPT testing. While text quality excels, formatting and image generation capabilities lag behind the overall performance improvements.
Read at ZDNET
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