Vibe Check: GPT-5.5 Has It All

OpenAI’s new model is a top-end senior engineer—and easy to talk to
 ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌
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Vibe Check

[https://every.to/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vdmliZS1jaGVjay92aWJlLWNoZWNrLWdwdC01LTUtaGFzLWl0LWFsbD9tZXRlcmVkX3BheXdhbGw9NCIsInBvc2l0aW9uIjoxfQ==]

VIBE CHECK: GPT-5.5 HAS IT ALL
[https://every.to/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vdmliZS1jaGVjay92aWJlLWNoZWNrLWdwdC01LTUtaGFzLWl0LWFsbD9tZXRlcmVkX3BheXdhbGw9NCIsInBvc2l0aW9uIjoyfQ==]

OPENAI’S NEW MODEL IS A TOP-END SENIOR ENGINEER—AND EASY TO TALK TO
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by Katie Parrott
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Midjourney/Every illustration.

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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://every.to/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vb3BlbmFpLmNvbS9pbmRleC9pbnRyb2R1Y2luZy1ncHQtNS01LyIsInBvc2l0aW9uIjo2fQ==],
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/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vcC9ncHQtNS01IiwicG9zaXRpb24iOjd9]:

 1. Best on senior-engineer coding. GPT-5.5 scored 62.5 on our Senior Engineer
    Benchmark versus 33.5 for Opus 4.7
    [https://every.to/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vdmliZS1jaGVjay9vcHVzLTQtNyIsInBvc2l0aW9uIjo4fQ==].
    Humans still score in the high 80s and low 90s. The twist: GPT-5.5’s best
    run used an Opus-written plan.
 2. 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.
 3. Strong everyday knowledge work. GPT-5.5 beat Opus 4.7 on dashboards and felt
    dependable for creating client deliverables or customer support replies.
 4. 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/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vcC9ncHQtNS01IiwicG9zaXRpb24iOjl9]
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/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vcC9ncHQtNS01P3NvdXJjZT1wb3N0X2J1dHRvbiIsInBvc2l0aW9uIjoxMH0=]

And watch our video Vibe Check with Dan Shipper
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Katie Parrott
[https://every.to/emails/click/0a7e2264cb45384f9a4c029ef50a01941ed6546379993be477e017002f91aaf7/eyJzdWJqZWN0IjoiVmliZSBDaGVjazogR1BULTUuNSBIYXMgSXQgQWxsIiwicG9zdF9pZCI6NDEzMiwicG9zdF90eXBlIjoicG9zdCIsInVybCI6Imh0dHBzOi8vZXZlcnkudG8vQGthdGllLnBhcnJvdHQxMiIsInBvc2l0aW9uIjoxNn0=]
is a staff writer at Every. You can read more of her work in her newsletter
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We build AI tools
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VIBE CHECK: GPT-5.5 HAS IT ALL

OPENAI'S NEW MODEL IS A TOP-END SENIOR ENGINEER—AND EASY TO TALK TO

by Katie Parrott

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, 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

1. 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.
2. 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.
3. Strong everyday knowledge work. GPT-5.5 beat Opus 4.7 on dashboards and felt dependable for creating client deliverables or customer support replies.
4. 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 has the benchmark results, Reach Test ratings, pricing, screenshots, and advice on when to reach for GPT-5.5 versus Opus 4.7.

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