---
title: "Vibe Check: GPT-5.5 Has It All"
subtitle: OpenAI’s new model is a top-end senior engineer—and easy to talk to
description: OpenAI’s new model is a top-end senior engineer—and easy to talk to
authors: [Katie Parrott]
publication: Vibe Check
publication_slug: vibe-check
published_at: "2026-04-23T17:00:00Z"
canonical_url: "https://every.to/vibe-check/gpt-5-5"
audience: everyone
slug: gpt-5-5
---
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Frontier models usually take a while to get used to. You have to learn their slow spots, when they need extra prompting, and when to keep a close eye on the output.
[GPT-5.5](https://openai.com/index/introducing-gpt-5-5/), out today, feels easier to settle into. It’s fast enough to use constantly, personable enough to collaborate with, and assertive enough to carry a plan through serious engineering work. It’s better at writing than any OpenAI model we’ve used in about a year, and it produced the strongest result we’ve seen on our new Senior Engineer Benchmark, which measures how well models can rewrite a messy production codebase the way a senior engineer would. It’s rare for a model to feel easier and stronger at the same time.
The [big insights from our testing](https://every.to/p/gpt-5-5):
- **Best on senior-engineer coding.** GPT-5.5 scored 62.5 on our Senior Engineer Benchmark versus 33.5 for Opus 4.7. Humans still score in the high 80s and low 90s. The twist: GPT-5.5’s best run used an Opus-written plan.
- **A real writing comeback.** It’s the strongest OpenAI model we’ve tested in a year, with cleaner structure and smoother logical progression than Opus 4.7.
- **Strong everyday knowledge work.** GPT-5.5 beat Opus 4.7 on dashboards and felt dependable for creating client deliverables or customer support replies.
- **Best with structure.** GPT-5.5 shines with a plan, an existing system, or a tight feedback loop. Opus 4.7 still has advantages on one-shot vibe coding, PowerPoint, Ruby, and some broad product-design tasks.
The [full Vibe Check](https://every.to/p/gpt-5-5) has the benchmark results, Reach Test ratings, pricing, screenshots, and advice on when to reach for GPT-5.5 versus Opus 4.7.
[Read the full Vibe Check](https://every.to/p/gpt-5-5?source=post_button)
And watch our video Vibe Check with **[Dan Shipper](https://every.to/@danshipper):**
[
](https://www.youtube.com/watch?v=GROt1Nd4asY)
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**_Katie Parrott_** _is a staff writer at Every. You can read more of her work in_ _her newsletter._
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