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Claude Haiku 4.5

anthropic.com

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Re: Claude Haiku 4.5

#91

If I'm close to weekly limits on Claude Code with Anthropic Pro, does that go away or stretch out if I switch to Haiku?

Sonnet 4.5 was two weeks ago. In the past I never had such issues, but every week my quota ended in 2-3 days. I suspect the Sonnet 4.5 model consumes more usage points than old Sonnet 4.1

I am afraid Claude Pro subscription got 3x less usage

Re: Claude Haiku 4.5

#93
post #68
post #65

Earlier quoted context omitted.

"pay for data on VRAM" RAM of GPU

But that doesn't make sense? Why would they keep the cache persistent in the VRAM of the GPU nodes, which are needed for model weights? Shouldn't they be able to swap in/out the kvcache of your prompt when you actually use it?

Your intuition is correct and the sibling comments are wrong. Modern LLM inference servers support hierarchical caches (where data moves to slower storage tiers), often with pluggable backends. A popular open-source backend for the "slow" tier is Mooncake: https://github.com/kvcache-ai/Mooncake

Re: Claude Haiku 4.5

#95
post #52

I am really interested in the future of Opus; is it going to be an absolute monster, and continue to be wildly expensive? Or is the leap from 4 -> 4.5 for it going to be more modest.

I wonder what the next smaller model after Haiku will be called. "Claude Phrase"?

Claude from Nantucket

Re: Claude Haiku 4.5

#96

I am really interested in the future of Opus; is it going to be an absolute monster, and continue to be wildly expensive? Or is the leap from 4 -> 4.5 for it going to be more modest.

My impression is that Sonnet and Haiku 4.5 are the same "base models" as Sonnet and Haiku 4, the improvements are from fine tuning on data generated by Opus.

I'm a user who follows the space but doesn't actually develop or work on these models, so I don't actually know anything, but this seems like standard practice (using the biggest model to finetune smaller models)

Certainly, GPT-4 Turbo was a smaller model than GPT-4, there's not really any other good explanation for why it's so much faster and cheaper.

The explicit reason that OpenAI obfuscates reasoning tokens is to prevent competitors from training their own models on them.

Re: Claude Haiku 4.5

#98

The main thing holding these Anthropic models back is context size. Yes, quality deteriorates over a large context window, but for some applications, that is fine. My company is using grok4-fast, the Gemini family, and GPT4.1 exclusively at this point for a lot of operations just due to the huge 1m+ context.

Is your company Tier 4? Anthropic has had 1M context size in beta for some time now. https://docs.claude.com/en/docs/build-with-claude/context-wi...

Only for Sonnet. No 1m for Haiku (this new model) and Opus.

This means 2.5 Flash or Grok 4 fast takes all the low end business for large context needs.

Re: Claude Haiku 4.5

#99

I am really interested in the future of Opus; is it going to be an absolute monster, and continue to be wildly expensive? Or is the leap from 4 -> 4.5 for it going to be more modest.

My impression is that Sonnet and Haiku 4.5 are the same "base models" as Sonnet and Haiku 4, the improvements are from fine tuning on data generated by Opus. I'm a user who follows the space but doesn't actually develop or work on these models, so I don't actually know anything, but this seems like standard practice (using the biggest model to finetune smaller models) Certainly, GPT-4 Turbo was a smaller model than G…

Which is all to say that I think the reason they went from Opus 3 to Opus 4 is because there was no bigger model to fine tune Opus 3.5 with.

And I would expect Opus 4 to be much the same.

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