Haiku 4.5 is a workhorse that makes the coding experience in Claude Code feel really fast. While Sonnet 4.5 remains the default, Haiku 4.5 now powers the Explore subagent which can rapidly gather context on your codebase to build apps even faster.

You can select Haiku 4.5 to be your default model in /model. When selected, you’ll automatically use Sonnet 4.5 in Plan mode and Haiku 4.5 for execution for smarter plans and faster results. To enter Plan mode, hit `Shift + Tab + Tab`

Haiku 4.5 is a great way to extend your Claude Code usage on the Pro plan. Haiku 4.5 is $1 per million input tokens and $5 per million output tokens, which means it is priced 3x lower than Sonnet 4.5 and slightly higher than Haiku 3.5.

Let us know how it feels to use Haiku 4.5 in Claude Code. We’re excited to keep making it better.

Claude Code v2.0.17 I don't see the option to choose Haiku 4.5 using /model

amazing! needed a lightweight Anthropic model for the agent I'm building. Playing around with it all day

let us know what you think!

Cool! It does sound like Haiku 4.5 will be great to build subagents. Can't wait to test this out with my subagents.

@claudeai is making people hit pay barriers more and more - you have to keep paying more and more to get services. This might be good for now - but soon im sure another company will replace it. If claude keeping being tight - it will be replaced.

We don’t need new models. Fix the ones you nerfed instead.

How is Haiku on writing tasks? If I wish to repurpose CC to be more of a researcher or writer agent, will this be a good segue?

Yes, I use CC for this :)

Exciting! Thanks for building a great product :)

i'm on the max plan but my usage limits don't reset anymore (been seeing this error since 2 days):

welp - there goes my week

Does it contain lead?

But actually it is indeed a good model to try building agents…

Quick question: does haiku 4.5 have the same 200k token context window limit?

For bug fixes seems like haiku will be the way to go

YOOO this is so handy to have in the subagent repertoire for extending claude's capabilities :') gonna use haiku in much the same way you are, to extend claude's Fog of War view in massive knowledgebases!

A strong sign of how AI tooling is maturing from capability to usability. Speed and context awareness are becoming the real differentiators. Do you think this kind of embedded agent design will redefine how developers approach problem solving?

solid!!

🫶🏿🧠

I really didn’t think Speed would be such a game changer for me, that it would always be about using the “best” (smartest) model. I was wrong.

Shame Claude doesn't actually work.. the few times it did work, worked well. Back to GPT.

im trying to understand where Haiku 4.5 fits in claude code? can anyone help me understand better

The latest version of Claude Code doesn’t have the Opus Plan mode anymore — is there any way to bring it back?

Extremely excited to test out this new model.

Haiku 4.5’s speed advantage and context-gathering capabilities make it ideal for rapid app development, complementing Sonnet 4.5 for deep code exploration.

Too many limits. Had to get codex since it’s been so bad.

I suspect that this model was used in the recent beta testing of Claude OS. I think it's ideal for web searches, and it's quite pleasant to converse with. Speed is very important, part of the future lies with Haiku.

Simply beautiful

Now edit a dropdown menu…

Impressive speed and efficiency with Haiku 4.5! The demo really showcases its potential for rapid prototyping. Excited to see how it performs in real-world projects great work!

impressive, looking forward to seeing the impact this has on sub agent work.

Sounds interesting

My vibe flow: Sonnet 4.5 + ultrathink 🫣

So its like the Claude 4.5 lite version?

Haiku > Sonnet, fr/fr

It's fast but not as smart. I prefer accuracy over speed.

I just tried to do a pretty simple financial task Sonnet 4.5 does fine and it basically told me I’m a criminal and it can’t help me 💀😂 it seems to either lack a very basic understanding of the world or is WAY too overcautious, or both?