Users rekindle debate over GPT‑5.4's 'thinking' abilities amid comparisons to newer models
- OpenAI’s April 23 launch of GPT‑5.5 revived user comparisons with March’s GPT‑5.4 Thinking, as testers on X and OpenAI forums argued the older model still feels stronger on deliberate, multi-step work. - The comparison centers on how models handle long tasks: GPT‑5.4 introduced visible planning, 1 million-token context, and 75.0% on OSWorld-Verified, while GPT‑5.5 is pitched as more intuitive and better at “carrying” work through tools. - The debate lands as OpenAI keeps reshuffling ChatGPT’s lineup, retiring older models and routing users between Instant and Thinking modes, turning GPT‑5.4 into a reference point for reasoning changes. (help.openai.com)
OpenAI’s April 23 release of GPT‑5.5 has pushed users back into a familiar argument: whether newer ChatGPT models actually “think” better than GPT‑5.4 Thinking did in March. (openai.com 1) (openai.com 2) In plain terms, “thinking” is OpenAI’s label for a model that spends more time planning before it answers. In ChatGPT, GPT‑5.4 Thinking can show a short preamble, keep working longer on hard tasks, and let users add instructions while it is still reasoning. (help.openai.com 1) (help.openai.com 2) OpenAI’s own March 5 announcement framed GPT‑5.4 as a model built for “reasoning, coding, and agentic workflows” in one system. The company said it supports up to 1 million tokens of context and posted benchmark gains including 75.0% on OSWorld-Verified and 57.7% on SWE-Bench Pro (Public). (openai.com) That made GPT‑5.4 Thinking a natural baseline for users judging later releases. OpenAI’s help pages describe it as ChatGPT’s “most capable reasoning model” for difficult work, including spreadsheets, polished frontend code, research across many web sources, and long tasks that need stronger memory of prior steps. (help.openai.com) GPT‑5.5 is being sold a little differently. OpenAI says the new model is “our smartest and most intuitive to use model yet,” and ChatGPT release notes say it is better at understanding complex goals, using tools, checking its work, and carrying multi-step tasks through to completion. (openai.com) (help.openai.com) That wording helps explain the split in user reaction. GPT‑5.4 was marketed around explicit reasoning behavior and visible planning, while GPT‑5.5 is marketed around smoother execution and agentic follow-through, which can feel different even when both are aimed at hard professional tasks. (openai.com 1) (openai.com 2) The product changes around them also matter. As of April 2026, OpenAI’s help center says GPT‑5.3 Instant is the default for logged-in ChatGPT users, while paid users can manually pick GPT‑5.4 Thinking and some requests in Instant can be auto-routed into Thinking for harder jobs. (help.openai.com) OpenAI has also been retiring older chat models in quick succession. Its help pages say GPT‑4o, GPT‑4.1, o4-mini, and GPT‑5 Instant and Thinking were retired from ChatGPT on February 13, 2026, and GPT‑5.1 models were removed on March 11, 2026. (help.openai.com) (help.openai.com) That churn leaves users comparing not just raw capability, but product behavior: speed, visible planning, tone, tool use, and whether a model keeps track of a long job without drifting. OpenAI’s own release notes now describe GPT‑5.5 as stronger on terminal workflows, GitHub issue resolution, and long-horizon coding tasks. (help.openai.com) (openai.com) So the renewed GPT‑5.4 debate is less about a single benchmark than about a moving target inside ChatGPT. As OpenAI swaps defaults and adds newer models, users are treating GPT‑5.4 Thinking as the reference point for what deliberate, step-by-step reasoning was supposed to feel like. (help.openai.com) (openai.com)
