# Anthropic — Claude Opus 4.5

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This file is the record of one model version: what the model registry states
about it, Anthropic's launch post, the first-party posts this record
holds about it, the outlets that reported on those posts, and other companies'
announcements that it runs on their platforms. A model ranks nothing here and
nothing is composed: each date names whose it is, and a field nothing states is
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- This model's page: https://forck.live/models/claude-opus-4-5
- Anthropic's page: https://forck.live/company/anthropic
- Every model: https://forck.live/models
- Catalogue: https://forck.live/llms.txt

## Model

- Name: Claude Opus 4.5
- Company: Anthropic (anthropic.com)
- Launch post: not held by this record
- Announced: not stated
- Launch source: not stated
- Launch chosen by: not stated
- Released (per models.dev): 2025-11-24
- Listed (per OpenRouter): 2025-11-24
- Open weights: no
- Posts about it: 0
- Outlets named under its posts: 0
- OpenRouter id: anthropic/claude-opus-4.5 — https://openrouter.ai/anthropic/claude-opus-4.5

## Posts about it

_Anthropic's own posts whose title names Claude Opus 4.5, and its launch post, in the record's order: dated newest first, undated last. The record reads the newest 50 first-party posts mentioning the model, every company's together, so a model mentioned more often than that lists the newest of them._

_This record holds no first-party post about Claude Opus 4.5 yet._

## Who reported on it

_This record names no outlet that reported on these posts._

## Where it runs

_Other companies' own announcements naming Claude Opus 4.5 and Anthropic — each is that company's post, not Anthropic's._

### Hugging Face — We Got Claude to Build CUDA Kernels and teach open models!

- Company: Hugging Face (huggingface.co)
- Announced: 2026-01-28
- Category: developer-tool-release
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://huggingface.co/blog/upskill
- Record: https://forck.live/items/1556-we-got-claude-to-build-cuda-kernels-and-teach-open-models
- Subject: Platform

Hugging Face announces upskill, a tool to generate agent skills using large models (like Claude Opus 4.5) and transfer them to smaller open models, demonstrated on CUDA kernel writing for diffusers models.

### Lovable — Lovable Now Supports Claude Opus 4.5

- Company: Lovable (lovable.dev)
- Announced: 2025-12-02T15:00:00+00:00
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://lovable.dev/blog/claude-opus-4-5-in-chat
- Record: https://forck.live/items/12116-lovable-now-supports-claude-opus-4-5
- Subject: Lovable / AI app builder

Lovable added Claude Opus 4.5 as a core model for chat mode and code generation, reporting 15% fewer mistakes when making edits, 5% higher project success rate, and noticeably better designs, at no additional cost to users.

### Amp — Try Claude Opus 4.5 With Us

- Company: Amp (ampcode.com)
- Announced: 2025-11-24
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://ampcode.com/news/try-opus
- Record: https://forck.live/items/7783-try-claude-opus-4-5-with-us
- Subject: Amp

Amp is offering a limited-time trial of Claude Opus 4.5 as the main agent in smart mode in its product. The company notes that while the model is cheaper than Opus 4.1, it remains more expensive than Gemini or Claude Sonnet 4.5.

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Record: https://forck.live/models/claude-opus-4-5
Catalogue: https://forck.live/llms.txt
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