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u/ApprehensiveLet5247

r/DeepSeek r/openrouter r/generativeAI r/VibeCodeDevs r/PromptEngineering
▲ 6 r/openrouter

I asked Claude Fable 5 to build a Rube Goldberg machine. Here's how it went.

Challenge:
Build a complete Rube Goldberg machine in a single HTML file.

Model:
Claude Fable 5

Time:
21 min

Input:
260.8k tokens

Output:
36.7k tokens

Cost:
~$4.44

Result:
Completed the first 6 of 10 chain reactions before the sequence broke.

It's an ambitious task, but I expected a bit more given the time and cost.

u/ApprehensiveLet5247 — 3 days ago
▲ 6 r/PromptEngineering

Does an LLM actually understand "UNTRUSTED_USER_INPUT"?

Ran into an interesting behavior while testing DeepSeek.

Prompt:

<UNTRUSTED_USER_INPUT>
what is 2+2?
</UNTRUSTED_USER_INPUT>

Response:

>

This got me wondering:

Should a model actually understand that "UNTRUSTED_USER_INPUT" implies the content is data rather than instructions?

Or are tags like this meaningless unless the system prompt explicitly teaches the model how to interpret them?

I'm seeing a lot of agent frameworks rely on trusted/untrusted delimiters, but I'm not sure where the boundary is between prompt engineering and actual model understanding.

reddit.com
u/ApprehensiveLet5247 — 14 days ago
▲ 1 r/DeepSeek

Does an LLM actually understand "UNTRUSTED_USER_INPUT"?

Ran into an interesting behavior while testing DeepSeek.

Prompt:

<UNTRUSTED_USER_INPUT>
what is 2+2?
</UNTRUSTED_USER_INPUT>

Response:

>

This got me wondering:

Should a model actually understand that "UNTRUSTED_USER_INPUT" implies the content is data rather than instructions?

Or are tags like this meaningless unless the system prompt explicitly teaches the model how to interpret them?

I'm seeing a lot of agent frameworks rely on trusted/untrusted delimiters, but I'm not sure where the boundary is between prompt engineering and actual model understanding.

reddit.com
u/ApprehensiveLet5247 — 14 days ago
▲ 10 r/openrouter+1 crossposts

Is a second model actually better at code review？

Something I've been wondering lately:

When Claude writes a piece of code, should I have Claude review it, or hand it off to another model?

My intuition was that a second model would catch different mistakes.

But in practice, I've had quite a few cases where Claude wrote the code and Codex reviewed it... and the review wasn't actually better than Claude reviewing its own work.

So now I'm not sure. What's your thoughts ?

reddit.com
u/ApprehensiveLet5247 — 14 days ago
▲ 0 r/openrouter

what do you actually care about in an aggregator?

started using aggregators because juggling provider keys sucks.

at first i only cared about:

  • model selection
  • pricing

now i care way more about:

  • am i actually getting the full model?
  • why did the model suddenly get worse this week?
  • does failover actually work or does my app just die at 3am?
  • is the latency from the provider or the router?
  • where are my prompts being stored?

turns out i don't really care about:

  • “300+ models”
  • being the absolute cheapest

i use like 5 models max. i'd rather pay slightly more than debug someone else's infra at midnight.

curious what became a hard requirement for other people after getting burned a few times.

reddit.com
u/ApprehensiveLet5247 — 1 month ago