Claude Opus 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
- 24 November 2025
What it does
The problem areas the model was built for. A model can carry several of each.
- Domain
- Language, Multimodal, Vision
- Task
- Code generation, Language modeling/generation, Quantitative reasoning, Search, Visual question answering, Translation, Image captioning, Instruction interpretation, Mathematical reasoning, Visual puzzles, Code autocompletion, Chat, Character recognition (OCR), Language modeling, Language generation, Text autocompletion, Retrieval-augmented generation, System control
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.
- Likely above 10²³ FLOP
- Yes
- Why it is tracked
- SOTA improvement
- Record confidence
- Unknown
SOTA on SWE-bench
Sources
Where this record came from and when it was last checked.
- Reference
- Introducing Claude Opus 4.5
- Last updated
- 24 April 2026
What the numbers mean
Background
Claude Opus 4.5 was published by Anthropic, in United States of America, in November 2025. industry is the category the publisher falls under.
It works in Language, Multimodal, Vision, and is recorded as doing code generation, Language modeling/generation, Quantitative reasoning, Search, Visual question answering, Translation, Image captioning, Instruction interpretation, Mathematical reasoning, Visual puzzles, Code autocompletion, Chat, Character recognition (OCR), Language modeling, Language generation, Text autocompletion, Retrieval-augmented generation, System control.
Its weights were never published, so it can only be reached through its provider. No graphics card changes that.
Training and provenance
The reason it appears in this catalogue at all is sOTA improvement.
Answers
Claude Opus 4.5 — common questions
Is Claude Opus 4.5 open source?
No. Claude Opus 4.5 has not had its weights published, so it exists only as a service controlled by its owner.
How many parameters does Claude Opus 4.5 have?
No parameter count has been published for Claude Opus 4.5, which is why no memory or speed figure appears on this page.
Who created Claude Opus 4.5?
Claude Opus 4.5 was published by Anthropic, based in United States of America, categorised as industry.
When was Claude Opus 4.5 released?
Claude Opus 4.5 was published in November 2025.
What is Claude Opus 4.5 used for?
Claude Opus 4.5 works in Language, Multimodal, Vision, and is recorded as handling code generation, Language modeling/generation, Quantitative reasoning, Search, Visual question answering, Translation, Image captioning, Instruction interpretation, Mathematical reasoning, Visual puzzles, Code autocompletion, Chat, Character recognition (OCR), Language modeling, Language generation, Text autocompletion, Retrieval-augmented generation, System control. Models frequently carry more than one of each, and the tags describe purpose rather than capability limits.
What GPU do I need to run Claude Opus 4.5?
None. Claude Opus 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.
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.