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Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

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131–140 of 144 posts

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#131
Most agent harnesses that have not been designed from scratch for current models are over-engineered.

Chances are whatever was needed to make earlier models perform well now either is no longer helping much or actively hurts performance (worse results, slower, uses more tokens …).

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#132
post #131

Most agent harnesses that have not been designed from scratch for current models are over-engineered. Chances are whatever was needed to make earlier models perform well now either is no longer helping much or actively hurts performance (worse results, slower, uses more tokens …).

Agreed!

Example: for large Eloqua/Marketo/HubSpot emails we would previously make a planner which delegated the sections to their own call.

GPT5.6 can do the whole thing. The planner is unhelpful.

My suggestion: feature flag your complex implementations so you can rapidly contrast with and without it. (Or a formal eval suite if you have one).

If you prefer the simpler path, delete the old path.

Note: the challenge is making things compatible with these tools. Obviously generating html directly has been simple for ages.

(Source: mopsy.ai)

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#133
post #76

Earlier quoted context omitted.

> Fable 5 is sick. [It] solves almost any task from start to finish, the way it should be done — no errors, perfect code. It's a miracle. > As for GPT-5.6 Sol — it doesn't even come close. I honestly don't understand why people even try to compare them. What kind of problems are you working on? I like Fable but when planning work on a complex C codebase it's making more mistakes than 5.6 Sol xhigh for me. In what sce…

I have a large monorepo that includes about 15 TypeScript services and many Rust services. Everything is well-documented and organized, with standardized and structured custom code. When an issue arises, I often test the systems by providing a minimal prompt, like: "this user, this is their email, this isn't working, figure it out in production." I send this to both Opus and ChatGPT, but it doesn't help. I've set up…

Claude is Extremely slow, especially fast few days. Codex is so much faster in in my opinion with comparable quality. Anthropic is going to fix their problems, but for me as a user that depends for the service to work, it's not acceptable. ChatGPT 5.5 is already a better version than Opus 4.8, at lest in my experience. Firstly, thing get done today and I don't see quality to be worse. I has many situation where Opus was just going in circles, finding more and more issues with the code it wrote a few hours back, to me this is counterproductive.

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#134

> The fix that worked is a schema transform at the provider boundary. For OpenAI-family models only, we rewrite every optional property to be required but nullable, using anyOf: [T, null], which gives the model an explicit way to say “not using this.” I admit, I've only used a bastardized form of MCP, but this smells... wrong? It's not clear to me why the Typescript type definitions would have any influence on (what…

It's not typescript definitions. Presumably it's zod schemas which are both typescript types and JSONSchema for the object.

Although tbh the article makes a lot of this obvious and trivial change in syntax.

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#135

AI wrapper companies still exist?

Must admit, for this particular case I don't see the appeal in using a wrapper.

Why would I not just use Codex directly?

The we wrote a bunch of prompts argument is kind of meh. That sort of thing has not only diminishing value with subsequent model releases but I actually believe will turn negative. The model will know better by default.

For example, initially giving the model some advice on code best practice was helpful. But now it's unhelpful because the model already knows best.

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#136
post #52

Earlier quoted context omitted.

They also migrated and that also made the workflow cheaper. It has everything to do with the article.

Reasonix, the harness, only works with DeepSeek. Neither are mentioned in the article at all, which was about a migration from Claude Opus to GPT 5.6. Maybe a bit of DeepSeek astroturfing going on?

I wish people were astroturfing it

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#137

Migrating my workflow to Reasonix with cache hits on Deepseek make requests practically free, and that's on unsubsidized American providers.

What's your config, how does it compare to pi

Here's my config for agents: https://codeberg.org/arik/agents It's a lot better since it's optimized for the model and cache hits, unlike other frontends that try to be more general.

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#139
post #94

Earlier quoted context omitted.

I've used that for about 15 years because I live abroad, it's called Google translate.

Google Translate can change the writing style of a text? I thought it would just translate between different languages.

Great gotcha

Re: Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

#140
post #102

Earlier quoted context omitted.

I would expect they have production based datasets they evaluate new models against.

I would not expect that. They wouldnt have missed mentioning it if that was the case. Its mostly driven by vibes.

>For four months, no frontier model beat Claude Opus in our production evals

What do you think that is referring to?

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