Follow Discord
Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.288 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 30 Sep 2026
One change · api

overview changedmodels/sonnet-4-5/overview

Nearest release: v2.1.286, published 6 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+6added
Lines−5removed
From line 1 where the diff opens
First seen 24 Aug 2026 this site's first read of the page
Recorded edits10to this page, all time

The whole hunk

from line 1, old and new numbered
/
lines
from line 1
11---
22title: Claude Sonnet 4.5
33url: https://platform.claude.com/docs/en/models/sonnet-4-5/overview
4description: "Claude Sonnet 4.5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.5 is a legacy model; Claude Sonnet 5.5 is the current Sonnet model."
4description: "Claude Sonnet 4.5 reference: lifecycle status, model IDs on every platform, context window, output limits, pricing, and migration resources. Claude Sonnet 4.5 is a deprecated model; Claude Sonnet 5.5 is the current Sonnet model."
55---
66 
7**Legacy.** Released September 29, 2025.
7**Deprecated.** Released September 29, 2025.
88 
9Although Claude Sonnet 4.5 is still available, you should consider migrating to Claude Sonnet 5.5 for improved performance. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-sonnet-45)
9Claude Sonnet 4.5 is deprecated: it is still functional but no longer recommended, and retires on November 30, 2026. Recommended replacement: Claude Sonnet 5.5. [See Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) · [Migrate to Claude Sonnet 5.5](https://platform.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-sonnet-45)
1010 
1111Model ID: `claude-sonnet-4-5-20250929`
1212 
from line 73
7373 
7474| Feature | Value |
7575| :---------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
76| [Status](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Active (legacy) |
76| [Status](https://platform.claude.com/docs/en/about-claude/model-deprecations) | Deprecated |
7777| Released | September 29, 2025 |
78| Retirement | Not sooner than September 29, 2026 |
78| Deprecated | September 30, 2026 |
79| Retires | November 30, 2026 |
7980| Platforms | Claude API, [Amazon Bedrock (InvokeModel)](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy), [Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai), [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws) |
8081 
8182## Resources
Feedback