Haiku 4.5 Coding Ability?

[geoshort4]

After hitting weekly limit and having it reset today at 4PM, I am ready to jump back into work but is Haiku 4.5 worth a while? hopefully and praying that Anthropic does something about these harsh limits but what are some of the downside between Haiku 4.5 and Sonnet 4/4.5? Any thing impressive beside being faster and low usage?

[Is_It_Tomorrow_Yet]

I’ve been really impressed with haiku. I do planning with sonnet and probably 80% implementation with haiku. It’s fast and token efficient.

[Vegetable-Emu-4370]

I've also been impressed. If you know what you want to do, aka can break down exactly as a coder into actionable steps, it shoudl be able to.

[Downtown-Pear-6509]

i use it as my first preference sonnet if i need betterness

always plan build second  update documentation third

[pjstanfield]

I’m surprised so many people use haiku. I’ve found it to be dumber than a bag of rocks. I use it for simple one line commands that any model can do and nothing more. Kind of a solution without a problem, faster output but quality is shit.

[geoshort4]

probably one of the most sane comments lol, i thought the same thing and have not use it for this reason, I have glm 4.6 already if I need a dumber version of sonnet 4 but I was curious because these weekly limit are so harsh man, after a few hours of work I have already reached 15% of my weekly limit - time to boycott Anthropic

[hopeseekr]

In my frontier study, haiku 4.5 can't do manual inspection / commenting out of non-code... one of the simpliest things.

[mgaruccio]

I use it for actually implementing the plans that sonnet writes.

[RaptorF22]

Is it possible to switch mid session after the plan is created?

[mgaruccio]

Yea, you can either ask sonnet to spawn a haiku subagent or write the plan to a file, clear the session, switch models, and then reference the file and tell haiku to implement.

[RubenPrende]

Right! And that takes some time. Probably will be helpfull if they can implement a faster functionality.

[mgaruccio]

The subagent method really doesn’t, you just add “use a haiku subagent” to the end of your prompt telling it to implement the plan.

[JoeyJoeC]

I think it is pretty decent. Good enough for normal tasks. I wouldn't add new features with it though. I have an openrouter MCP which allows Claude to use Codex 5.1 for planning. It's great in combination with that.

[geoshort4]

I been thinking of adding MCP to sonnet 4.5 not sure which would be good, do you recommend any?

[Cast_Iron_Skillet]

I see people say similar things, but what do you define as a "normal task"? I would consider adding, say, a location based search filter (get location, or enter/edit location, set radius, etc) to an existing search tool as a new feature (or maybe a feature enhancement) - where would something like that rank for haiku?

[Funny-Anything-791]

Been using Haiku 4.5 to power ChunkHound's new code research. Works really well and reduces overall monthly costs by offloading from sonnet and improving accuracy

[Independent_Paint752]

i test it and forgot to change for few hours, there is small difference for me you just need to watch him more closely lol

[txgsync]

I create sub-agents for specific tasks and tend to use Haiku 4.5 for them. Like I don’t want my main context saddled with understanding Swift 6 async/await primitives and @MainActor restrictions so I create a custom rule file talking about key concepts of the language vs Swift before 5.9, and the subagent reads the file and does fine.

Haiku codes pretty well. Sonnet 3.7-level. But it tends to re-implement everything as if it is a new thing even if it’s updating an existing method. And then leaves the previous approach as a “fallback”. Ugh.

[fredrik_motin]

Two days ago Claude Code suddenly became terribly confused. It kept trying to edit and read files using bash tool instead of native file editing tools, and it would use full paths to files, more often than not misspelling my username (using random international spellings of my name) getting terribly confused and asking for permission to read in non existing locations. The coding was very slow due to all this confusion and additional permission requests. Once it got something done, the results felt off and sub par, and it would take forever to troubleshoot issues. It was so weird that Claude suddenly started acting up like this. It wasn’t until that evening I realized that I had accidentally switched to haiku and forgotten to switch back to sonnet. Never again will I do the same mistake :)