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Anthropic claude-sonnet-4-5-20250929

Claude Sonnet 4.5 (Anthropic)

Shutdown scheduled Shuts down in 61 days

No — Claude Sonnet 4.5 is not deprecated as of July 30, 2026. Anthropic has not deprecated it, but publishes September 29, 2026 (in 61 days) as the earliest date it could be retired.

The September 2025 Sonnet, still active but with the second-nearest earliest retirement date of any live Anthropic model. It is the last Sonnet to use explicit extended thinking rather than the adaptive thinking introduced in 4.6.

The facts

Provider Anthropic
Model id claude-sonnet-4-5-20250929
Also published as claude-sonnet-4-5
Released September 29, 2025
Deprecated not deprecated
Shutdown (earliest) September 29, 2026 · in 61 days

The provider publishes this as the earliest date the model could be retired, not a commitment. It may move later, but not earlier.
Status Shutdown scheduled
Last verified July 30, 2026

Frequently asked questions

When will Anthropic Claude Sonnet 4.5 shut down?
Anthropic Claude Sonnet 4.5 is scheduled to shut down on September 29, 2026, in 61 days. Anthropic publishes this as the earliest possible retirement date rather than a firm commitment, so it may move later — but not earlier.
Is Anthropic Claude Sonnet 4.5 still available?
Yes. Anthropic Claude Sonnet 4.5 is active and fully supported as of July 30, 2026.
Does this apply to claude-sonnet-4-5 too?
Yes. Anthropic Claude Sonnet 4.5 is also published as `claude-sonnet-4-5`; that id shares the same lifecycle dates as `claude-sonnet-4-5-20250929`.

Sources

Found something wrong? The data is one YAML file — edit it on GitHub.

This page, for machines

JSON Markdown Badge JSON

Drop the badge in a README so it turns red the day this model is retired:

[![claude-sonnet-4-5-20250929](https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/anthropic/claude-sonnet-4-5-20250929.json)](https://modeldeprecations.dev/anthropic/claude-sonnet-4-5-20250929)

Other Anthropic models

All Anthropic deprecations →

How to use this site

The full guide, in Markdown. Copy it and hand it to a coding agent verbatim.

# How to use modeldeprecations.dev

[modeldeprecations.dev](https://modeldeprecations.dev) answers one question per model: is it deprecated,
when does it shut down, and what replaces it. Every date on the site is cited to the
provider's own documentation, with the date we last checked it.

Three lifecycle states are used, matching the providers' own vocabulary:

- **active** — still supported, no deprecation announced.
- **deprecated** — the provider has announced it is going away. It still answers requests.
- **retired** — API access is gone. Requests fail.

A model can be active *and* carry a shutdown date: Anthropic publishes a
"not sooner than" date and Google publishes an earliest shutdown date for models
that are current and fully supported. Those are reported as scheduled shutdowns,
not deprecations, because that is what the provider actually committed to.

## Check one model

```bash
curl https://modeldeprecations.dev/api/v1/models/openai/gpt-4-32k.json
```

Or fetch the page as Markdown, which includes the answer, the dates and the sources:

```bash
curl https://modeldeprecations.dev/openai/gpt-4-32k.md
```

## Full catalog

```bash
curl https://modeldeprecations.dev/api/v1/models.json
```

Ids are `provider/model`. Dated snapshots (`gpt-4-32k-0613`) are listed as aliases of
their canonical entry rather than as separate records.

Each entry carries `computed_status`, the lifecycle state recomputed against the build
date — so a model whose shutdown has passed reads `retired` without anyone editing data.

## Badges

A shields.io endpoint per model, for READMEs that should go red when a model dies:

```
https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/openai/gpt-4-32k.json
```

## Calendar and changelog

- Subscribe to every shutdown date: https://modeldeprecations.dev/calendar.ics
- Changelog RSS: https://modeldeprecations.dev/changelog.xml

## JSON Schema

```bash
curl https://modeldeprecations.dev/api/v1/schema.json
```

## Contribute

Data lives in YAML under `models/{provider}/{model}.yaml` in the
[GitHub repo](https://github.com/mnfst/modeldeprecations.dev). Every lifecycle date needs a source URL; CI rejects a
date without one. Open a PR.

## For agents

- Machine-readable overview: https://modeldeprecations.dev/llms.txt
- This guide plus every model inline: https://modeldeprecations.dev/llms-full.txt
- Any page also exists as Markdown: append `.md` to a model URL.
- In a browser, this site registers a **WebMCP** tool on `navigator.modelContext`:
  `check_model_deprecation`, `list_shutdowns`, `find_replacement`, and `get_usage_guide`.
- Parameters each model accepts are catalogued on the sibling site, https://modelparams.dev.