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Anthropic claude-sonnet-4-20250514

Claude Sonnet 4 (Anthropic)

Retired

Yes — Claude Sonnet 4 is retired. Anthropic deprecated it on April 14, 2026 and shut it down on June 15, 2026; API requests to it now fail. The recommended replacement is Claude Sonnet 4.6.

The workhorse of the Claude 4 generation, and for a year the default in Claude Code. Retired June 15, 2026 in the same announcement as Opus 4.

The facts

Provider Anthropic
Model id claude-sonnet-4-20250514
Also published as claude-sonnet-4-0
Released May 14, 2025
Deprecated April 14, 2026
Shutdown June 15, 2026 · 45 days ago
Status Retired
Last verified July 30, 2026

What to use instead

Anthropic Claude Sonnet 4.6 claude-sonnet-4-6 Provider-recommended Shutdown scheduled

Sonnet 4.6 keeps the same pricing and raises the context window to 1M tokens. Its adaptive thinking replaces the explicit thinking budget Sonnet 4 used, so any code setting thinking.budget_tokens needs review.

What parameters claude-sonnet-4-6 accepts on modelparams.dev

Change the id

In most cases the migration is one string. Check the parameter differences before you ship — newer models drop older sampling knobs more often than they add them. 

- "model": "claude-sonnet-4-20250514"
+ "model": "claude-sonnet-4-6"

Frequently asked questions

When did Anthropic Claude Sonnet 4 shut down?
Anthropic Claude Sonnet 4 shut down on June 15, 2026. API requests to it fail from that date onward.
What replaces Anthropic Claude Sonnet 4?
Anthropic recommends Claude Sonnet 4.6 (`claude-sonnet-4-6`) as the replacement for Anthropic Claude Sonnet 4. Sonnet 4.6 keeps the same pricing and raises the context window to 1M tokens. Its adaptive thinking replaces the explicit thinking budget Sonnet 4 used, so any code setting thinking.budget_tokens needs review.
Is Anthropic Claude Sonnet 4 still available?
No. Anthropic Claude Sonnet 4 is retired and no longer served — it was shut down on June 15, 2026. Calls to it return an error.
How do I migrate from Anthropic Claude Sonnet 4 to claude-sonnet-4-6?
Swap the model id in your API call: replace "claude-sonnet-4-20250514" with "claude-sonnet-4-6". Sonnet 4.6 keeps the same pricing and raises the context window to 1M tokens. Its adaptive thinking replaces the explicit thinking budget Sonnet 4 used, so any code setting thinking.budget_tokens needs review.
Does this apply to claude-sonnet-4-0 too?
Yes. Anthropic Claude Sonnet 4 is also published as `claude-sonnet-4-0`; that id shares the same lifecycle dates as `claude-sonnet-4-20250514`.

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-4-20250514](https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/anthropic/claude-sonnet-4-20250514.json)](https://modeldeprecations.dev/anthropic/claude-sonnet-4-20250514)

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.