Claude Haiku 4.5
No estimate
No hardware requirements for this model
The weights for this model have not been published, so it cannot be downloaded or run on your own hardware at any size. It is reachable only through its provider, and no graphics card changes that.
On record
Full specification
Everything on record for this model. Most of it describes how it was trained rather than how it runs — useful context for judging how much work went into it, and how it compares with models built at a different scale.
Origin
Who built this model, where, and when it was published.
- Organisation
- Anthropic
- Organisation type
- Industry
- Country
- United States of America
- Published
- 15 October 2025
What it does
The problem areas the model was built for. A model can carry several of each.
- Domain
- Language
- Task
- Chat, Code generation, Language modeling/generation, Question answering
Size
How large the model is and how much data it was trained on. Parameters are the figure that decides whether it fits on a given graphics card.
- Training data
- tokens
Availability
Whether you can obtain the model and run it on your own hardware, which is what decides if any of the graphics-card figures on this page apply.
- Weights
- Closed — provider access only
- Model access
- API access
- Training code
- Unreleased
How it is classified
Labels the source dataset applies when tracking notable models, and how confident it is in the entry.
- Why it is tracked
- Significant use
- Record confidence
- Unknown
Likely significant use as one of Anthropic's flagship models
Sources
Where this record came from and when it was last checked.
- Reference
- Introducing Claude Haiku 4.5
- Last updated
- 24 April 2026
What the numbers mean
Where it came from
Claude Haiku 4.5 was published by Anthropic, in United States of America, in October 2025. The organisation is categorised as industry.
It works in Language, and is recorded as doing chat, Code generation, Language modeling/generation, Question answering.
Because the weights are not available, none of the hardware figures elsewhere on this site apply to it.
Training and provenance
It is tracked in the underlying dataset for one reason in particular: significant use.
Answers
Claude Haiku 4.5 — common questions
How many parameters does Claude Haiku 4.5 have?
No parameter count has been published for Claude Haiku 4.5, which is why no memory or speed figure appears on this page.
Who created Claude Haiku 4.5?
Claude Haiku 4.5 was published by Anthropic, based in United States of America, categorised as industry.
When was Claude Haiku 4.5 released?
Claude Haiku 4.5 was published in October 2025.
What is Claude Haiku 4.5 used for?
Claude Haiku 4.5 works in Language, and is recorded as handling chat, Code generation, Language modeling/generation, Question answering. These are the areas it was designed around; they describe intent rather than a hard boundary.
What GPU do I need to run Claude Haiku 4.5?
None. Claude Haiku 4.5 is a closed model — its weights were never published, so it cannot be downloaded or run on your own hardware at any price. It is reachable only through its provider.
Is Claude Haiku 4.5 open source?
No. Claude Haiku 4.5 has not had its weights published, so it exists only as a service controlled by its owner.
The other direction
Looking at it from the other side?
This page starts from the model. If you already own a card and want to know everything it will run, start from the hardware instead.