GPT-5 Pro
OpenAI's higher-compute GPT-5 model tier for harder reasoning tasks, offered via ChatGPT Pro.
Used as a second-opinion reviewer that catches what other models missed in code and plans,12 and for hard problems, specs and tasks given a large pasted context.345 The main caveats are cost, at about 6x the price of standard GPT-5.5,6 and slowness that makes it better suited to prompts you check on later.7
Why people recommend it
Catches misses · 2
Commenters use it to review code or plans from other models and say it often finds things they missed.
“The latter will often pick up on things that might have been missed, and will usually provide good suggestions.”
“Codex usually ends up finding missing things in Claudes plan.”
Hard problems · 2
Described as indispensable for some problems and useful for producing specs and code samples.
“I like Pro also for better access to 5.2 Pro which is indispensable for some problems”
“Then I paste the subset of files into GPT 5.2 Pro, and give it $TASK.”
Exploring trade-offs · 1
Used to explore and compare different technical approaches and their trade-offs.
“I used ChatGPT-5.2-Pro mainly to explore and compare different compression approaches and trade-offs.”
Caveats and dissent
High cost · 1
Called notoriously expensive, about 6x the price of GPT-5.5, and not a daily driver.
“GPT-5.5 Pro is a notoriously expensive model, it's 6x the price of GPT-5.5. Not something to use as a daily driver!”
Slow responses · 1
So slow that one commenter pastes in big prompts and checks back an hour later.
“5.5 Pro is so slow that it’s not a big deal to paste big prompts into it”
Often compared with
Who recommends it in their own words
Threads where it came up
- Claude Fable is relentlessly proactive 2 mentions
- GPT-5.6 Sol Ultra will be in Codex 1 mention
- Ford hired AI and sacked humans. It backfired badly 1 mention
- AI's Affordability Crisis 1 mention
- Ask HN: What is best way to provide continuous context to models? 1 mention
- Show HN: Minimalist editor that lives in browser, stores everything in the URL 1 mention
Also written as GPT-5.5 Pro, GPT 5.5 Pro, GPT-5.5-Pro. Data: gpt-5-pro.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 8
“5.5 Pro is so slow that it’s not a big deal to paste big prompts into it”
“The latter will often pick up on things that might have been missed, and will usually provide good suggestions.”
“I use OpenAI via a subscription, as is anyone else using GPT-5.5-Pro”
“Codex usually ends up finding missing things in Claudes plan.”
“GPT-5.5 Pro is a notoriously expensive model, it's 6x the price of GPT-5.5. Not something to use as a daily driver!”
“Then I paste the subset of files into GPT 5.2 Pro, and give it $TASK.”
“I used ChatGPT-5.2-Pro mainly to explore and compare different compression approaches and trade-offs.”
“I like Pro also for better access to 5.2 Pro which is indispensable for some problems”