---
title: "OpenRouter anthropic/claude-sonnet-4 expires 2026-10-15 | Harbyn"
description: "OpenRouter anthropic/claude-sonnet-4 expires 2026-10-15."
canonical: "https://harbyn.com/changes/openrouter/2026-10-15-unbiased-pareto-26-10-preview-expires-2026-10-15"
last-updated: 2026-10-15
---

# OpenRouter anthropic/claude-sonnet-4 expires 2026-10-15

Markdown version of <https://harbyn.com/changes/openrouter/2026-10-15-unbiased-pareto-26-10-preview-expires-2026-10-15>.

Retirement - OpenRouter. high severity. In effect.

The OpenRouter models API lists an expiration date of 2026-10-15 for anthropic/claude-sonnet-4. After that date requests to this model id are expected to fail on OpenRouter. No replacement is listed by the API.

The deadline passed on Oct 15, 2026.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [OpenRouter](https://harbyn.com/vendors/openrouter.md) |
| Product | models |
| Kind | Retirement |
| Severity | high |
| Status | In effect |
| Announced | Oct 15, 2026 (undated by the vendor; the day it first appeared) |
| Effective | Oct 15, 2026 |
| Added to Harbyn | Oct 15, 2026 |
| Lead time | Added on the day of the deadline |
| Model IDs | `anthropic/claude-sonnet-4` |
| Review | Automated, extracted by a deterministic parser |

## Find it in your code

```sh
npx harbyn scan
```

The scanner reads your repository on your machine and reports every file and line that uses the identifiers above. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://openrouter.ai/api/v1/models> (spec, fetched 2026-10-15 04:48 UTC, sha256 `a2368162f0254da8ff105492e86346998113832a00670f816684921247332fce`)

## Related changes

### More from OpenRouter

- [z-ai/glm-5.3 price change](https://harbyn.com/changes/openrouter/2026-10-15-z-ai-glm-5-3-price-change.md) (Pricing, announced Oct 15, 2026)
- [deepseek/deepseek-v4-flash-0731 price change](https://harbyn.com/changes/openrouter/2026-10-14-deepseek-deepseek-v4-flash-0731-price-change.md) (Pricing, announced Oct 14, 2026)
- [unbiased/pareto-26.10-preview expires 2026-10-15](https://harbyn.com/changes/openrouter/2026-10-14-unbiased-pareto-26-10-preview-expires-2026-10-15.md) (Retirement, effective Oct 15, 2026)
- [meta-llama/llama-4-scout price change](https://harbyn.com/changes/openrouter/2026-10-16-meta-llama-llama-4-scout-price-change.md) (Pricing, announced Oct 16, 2026)

### Changes at other vendors

- [Google Cloud Run and Functions: Node.js 20 runtime decommission](https://harbyn.com/changes/google-cloud/2026-10-08-node-js-20-runtime-decommission.md) (effective Oct 30, 2026)
- [Mistral AI: Z.ai GLM 5.2 (zai-glm-5-2) retires on Mistral on October 31, 2026](https://harbyn.com/changes/mistral/2026-09-29-z-ai-glm-5-2-deprecated-and-scheduled-for-retirement.md) (effective Oct 31, 2026)
- [Fireworks AI: DeepSeek V4 Flash 0731 retires from Serverless Training November 2](https://harbyn.com/changes/fireworks/2026-10-18-upcoming-serverless-training-deprecation-deepseek-v4-flash-0731.md) (effective Nov 2, 2026)
- [GitHub: GitHub Actions: macOS 14 runner image retired on November 2, 2026](https://harbyn.com/changes/github/2026-10-01-github-actions-macos-14-runner-image-retirement.md) (effective Nov 2, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)