GPT‑5.5 Instant is now live on ZenMuxAI.
Available via both:
- OpenAI-compatible API
- Anthropic-compatible API
This is a surprisingly meaningful upgrade over GPT‑5.3 Instant:
- 52.5% fewer hallucinated claims
- much better self-correction
- shorter denser responses
- stronger personalization & memory usage
- major gains in math / science / multimodal evals
One subtle but important change:
GPT‑5.5 Instant is much better at realizing its own reasoning mistakes and continuing to debug instead of stopping early.
That matters a lot for:
Coding, Agents, research, long-context workflows.
Now available on ZenMuxAI.
GPT-5.5 Instant is starting to roll out in ChatGPT.
It’s a big upgrade, giving you smarter, clearer, and more personalized answers in a warmer, more natural tone.
And it's also more concise, which we heard you wanted. We think you'll love chatting with it.