Bold claim: OpenAI’s GPT-5.1 lineup is designed to be faster, more talkative, and easier to tailor to your needs. Here’s a thorough reshaping of the original piece, preserving the core information while expanding with clarifications and context for beginners, and keeping a friendly, professional tone.
OpenAI has released enhancements to its GPT-5 family, introducing GPT‑5.1 with several targeted upgrades. The default chat model, GPT‑5.1 Instant, now offers improved instruction-following to make conversations more aligned with user expectations. A separate reasoning model, GPT‑5.1 Thinking, is reported to be faster and to generate responses that are easier to understand. There’s also GPT‑5.1-Codex-Max, the coding-focused variant, which is trained to use compaction techniques to handle long-running tasks more efficiently.
In practice, Instant and Thinking power the ChatGPT experience. An auto-routing system automatically selects which model to use for a given chat session. OpenAI notes that user feedback indicated a desire for models that feel enjoyable to speak with, prompting adjustments to default response styles. The release also increases customization options, allowing users to influence chat tone and style more directly. In addition to existing presets, ChatGPT now offers three new styles: Quirky, Candid, and Professional. Personalization options and custom instructions let users further tailor how responses come across.
The broader GPT‑5 rollout earlier this year sparked some controversy, notably when OpenAI briefly removed the ability to select older models, disrupting many workflows. OpenAI later clarified that while automated model selection remains in place to optimize conversations, there would be ample opportunity for users to evaluate changes and provide feedback as new models roll out. Sunset periods will be clearly communicated well in advance.
A key objective behind the updated response settings is to help ChatGPT feel more like a distinct personality. OpenAI explains that the preset styles reflect observations about how people naturally steer the model during dialogue. While these presets were released to all users, the more granular fine-tuning controls are being tested with a subset of users as part of an experiment.
Among community reactions, some Hacker News participants expressed a preference for more concise, less conversational responses, noting that the Efficient (formerly Robot) preset serves that need. Others defended conversational tone as a matter of user preference and user experience, suggesting that a balance between clarity and warmth can benefit many tasks.
The GPT‑5.1‑Codex-Max variant builds on the Codex platform with improvements geared toward coding workloads. In SWE-bench Verified tests, GPT‑5.1‑Codex-Max outperformed prior versions while consuming fewer reasoning tokens, signaling more efficient reasoning. An additional capability on this model is an Extra High (xhigh) reasoning effort level, supplementing the existing low, medium, and high settings.
Benchmarks and user discussions around Codex‑Max highlighted ongoing interest in better context management and practical coding aids. Several users suggested expanding features for context handling and making Codex features accessible through more interfaces, such as a chat option or additional integration points. The Codex model is already available in Codex CLI and several integrated development environment (IDE) extensions, with API access planned for the near future.
Author: Anthony Alford
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