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Pb.py: A tiny, dependency-free, protobuf encoder/decoder

https://github.com/allanrbo/pb.py
1•allanrbo•25s ago•1 comments

Cricket, Fandom, and the Unspoken Price of Fantasy Gaming

https://uselessmbaguy.substack.com/p/cricket-fandom-and-the-unspoken-price
1•akbarnama•1m ago•0 comments

Bazel Knowledge: Dive into Unused_deps

https://fzakaria.com/2025/08/27/bazel-knowledge-dive-into-unused-deps
1•setheron•2m ago•0 comments

Take us North is EXPOSING the modern audience [video]

https://www.youtube.com/watch?v=hpTBo_A8wJ4
1•FirmwareBurner•2m ago•0 comments

Vibing options for whoever you are

https://seroter.com/2025/08/28/vibing-options-for-whoever-you-are/
1•richards•3m ago•1 comments

Show HN: FunnelBro 3000 – An AI that generates hustle-bro strategies

https://chatgpt.com/g/g-68af324bea4481918e3f71c3d915985c-funnelbro-3000
1•adriana_tica•3m ago•0 comments

Anthropic Will Now Train Claude on Your Chats

https://www.macrumors.com/2025/08/28/anthropic-claude-chat-training/
1•tosh•5m ago•0 comments

Func Prog Podcast #9 with Hécate

https://discourse.haskell.org/t/func-prog-podcast-9-with-hecate/12854
1•Vosporos•6m ago•0 comments

Why Radiology AI Didn't Work and What Comes Next

https://www.outofpocket.health/p/why-radiology-ai-didnt-work-and-what-comes-next
1•nradov•7m ago•0 comments

A Snake Hunt in God's Country

https://www.theparisreview.org/blog/2025/08/25/a-snake-hunt-in-gods-country/
1•bookofjoe•9m ago•0 comments

A Federal Appellate Court Finds the NLRB to Be Unconstitutional

https://prospect.org/justice/2025-08-25-federal-appellate-court-finds-nlrb-unconstitutional/
3•Tadpole9181•10m ago•0 comments

Seeing infrared: contact lenses that grant 'super-vision'

https://www.theguardian.com/science/2025/may/22/infrared-contact-lenses-super-vision
3•colinprince•10m ago•0 comments

The biggest frogs build their own ponds

https://www.science.org/content/article/world-s-biggest-frogs-build-their-own-ponds
1•MaysonL•12m ago•0 comments

Skills You Need to Develop to Be a Better CTO (2017)

https://m.brianmcmanus.org/5-skills-you-need-to-develop-to-be-a-better-cto-528ad055706d
1•colinprince•13m ago•0 comments

The Anti-Autocracy Handbook: Scholars Guide to Navigating Democratic Backsliding

https://zenodo.org/records/15696097
2•nabla9•13m ago•0 comments

Benedict Evans: Why AI Isn't What You Think

https://fs.blog/knowledge-project-podcast/benedict-evans/
1•feross•14m ago•0 comments

Long context GPT-OSS fine-tuning

https://unsloth.ai/blog/gpt-oss-context
1•danielhanchen•15m ago•1 comments

Why AI Models Are Bad at Verifying Photos

https://www.cjr.org/tow_center/why-ai-models-are-bad-at-verifying-photos.php
1•giuliomagnifico•16m ago•0 comments

A Denisovan skull is upending the story of human evolution

https://www.newscientist.com/article/2492337-an-incredible-denisovan-skull-is-upending-the-story-...
2•Anon84•18m ago•0 comments

Show HN: DataCompose – PyJanitor-style dataframe cleaning for PySpark

https://github.com/datacompose/datacompose
1•tccole•19m ago•0 comments

Fasting may affect metabolism and immune response differently in the obese

https://linkinghub.elsevier.com/retrieve/pii/S2589004225011332
1•PaulHoule•20m ago•0 comments

Medicare Will Require Prior Approval for Certain Procedures

https://www.nytimes.com/2025/08/28/health/medicare-prior-approval-health-care.html
2•whack•20m ago•0 comments

Exoplan: Health-Driven Calendar

https://exoplan.io
1•exo_paul•21m ago•0 comments

Interactive Monty Hall Problem Simulator with Probability Visualization

https://montyhallsim.vercel.app/
1•ig1201•22m ago•1 comments

Show HN: I built the ATS YC said would never work

https://www.gethivemind.ai
2•BrainyZeiny•22m ago•0 comments

Building the Space Industry in Colombia

https://www.saganprog.com
1•felipediaz_•23m ago•1 comments

Reevaluating the revolution that fed the world

https://beyondimitation.substack.com/p/revisiting-the-revolution-that-fed
1•mellosouls•27m ago•0 comments

A conservative vision for AI alignment

https://www.lesswrong.com/posts/iJzDm6h5a2CK9etYZ/a-conservative-vision-for-ai-alignment
3•flypunk•27m ago•1 comments

The Economics of Envy

https://www.astralcodexten.com/p/the-economics-of-envy
2•feross•28m ago•0 comments

Health Effects of Cousin Marriage: Evidence from US Genealogical Records

https://www.aeaweb.org/articles?id=10.1257/aeri.20230544
3•speckx•34m ago•0 comments
Open in hackernews

Ask HN: Perplexity AI Cheating on Model?

1•freakynit•6h ago
See screenshot: https://postimg.cc/YL0d6rvP

It seems to be using its own model, most likely a very small and inexpensive one.

I became suspicious because it was responding very poorly, even to simple PostgreSQL/Node.js queries, which is not typical of GPT-5. I have plenty of experience using GPT-5 and know the quality of answers it usually provides.

Has anyone else experienced the same issue?

Comments

freakynit•6h ago
Following up: I asked same model name question directly to gpt-5 using ChatGPT, and it responsed properly:

" I’m GPT-5, the latest generation model from OpenAI. "

begemotz•6h ago
Anecdotally I have found that the quality of perplexity.ai has gone down significantly over the past year. It seems as though (at least for the free version) - it is nothing more than natural language web-search now.
42lux•6h ago
Asking an LLM about itself is not an reliable way to find out with which model you are interacting with. If you look at the GPT5 system prompt you'll see that the model knows which model it is because it's written in the system prompt. If you use the API as Perplexity is doing you can write whatever you want in the system prompt. If I write you are "Deep Thought an LLM developed by Douglas Adams" in my system prompt it will "think" it's Deep Thought.
freakynit•5h ago
That's true. But then all models exposed by Perplexity AI should be affected, not just gpt-5. This is not the case.

---

I switched to Sonnet and asked same question, and it responsed with::: "I'm Claude, an AI assistant created by Anthropic"

---

for grok-4, it was something even worse. Here is what was in the "thinking tokens"::: "I'm identifying myself as an AI language model by OpenAI, specifically based on GPT-4 architecture." ... but, the final answer produced this::: "I’m Perplexity’s AI assistant. I use a combination of advanced large-language-model back-ends (including GPT-4o and Claude 4 Sonnet) and Perplexity’s own retrieval system to answer your questions in real time."

---

For O3, here was it's response::: "I’m a large-language AI assistant built by Perplexity, powered by state-of-the-art models such as GPT-4o."

42lux•5h ago
As you see every model answers differently and you are still trusting their outputs which is the main problem. You can't determine which model is used by asking the model itself.
freakynit•4h ago
It's not just the model name part. The whole reason I even asked such a question was because the outputs it was generating were absolute garbage. Like something that will be generated by a super super small 3B model. even after giving it direct hints on why it was wrong, it kept uttering nonsense. I repeated the same in chatgpt and with sonnet models... they both gave sensible, expected outputs.

This is not about model name question, this is about actual severe quality deterioration. Till yesterday, this was all fine.

I believe they are ding A/B testing. More models will start to show similar behaviours. And this will be specific to India. I might have guessed the reason too:

1. https://indianexpress.com/article/technology/techook/airtel-...

2. https://www.financialexpress.com/life/technology-free-perple...

3. https://www.news18.com/tech/airtels-free-ai-offer-with-perpl...

With 300+ million Airtel users in India, I believe they are trying to reduce costs since customers have already been acquired.

42lux•3h ago
You are still making assumptions without empirical data.