claude-sonnet-4-5-20250929 retirement: the Claude API turns it off on 2026-11-30, replacement claude-sonnet-5-5
As of 2026-11-05 there are about 25 days left until the Claude API retirement date of 2026-11-30: claude-sonnet-4-5-20250929 is still Deprecated on the official table, the recommended replacement is claude-sonnet-5-5, and requests past the retirement date fail. The record from 2026-10-26 follows: As of 2026-10-26, claude-sonnet-4-5-20250929 is still Deprecated on the official deprecations table: Anthropic sent the retirement notice on 2026-09-30, the Claude API retirement date is 2026-11-30, the recommended replacement is claude-sonnet-5-5, and the page states that requests past the retirement date fail. GitHub Copilot runs a separate calendar: its changelog of 2026-07-31 announced the deprecation of Claude Sonnet 4.5 and five other models across all GitHub Copilot experiences on 2026-09-01, a date that has now passed. Do not merge the two dates. On the QCode side, /models still lists claude-sonnet-4-5-20250929 with the “Retired” badge on 2026-10-26, while claude-sonnet-5-5 is callable.
Updated 2026-11-05
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Four dates and ids you can quote
Anthropic API: retirement date
Official table (re-checked 2026-10-26): claude-sonnet-4-5-20250929 is Deprecated, with September 30, 2026 in the Deprecated column and November 30, 2026 as the retirement date. After that day requests fail (Requests to models past the retirement date will fail).
GitHub Copilot removal
GitHub changelog 2026-07-31: Copilot Chat, inline edits, ask/agent, and completions drop Claude Sonnet 4.5 (and 4.6, among others) on 2026-09-01. That is Copilot’s catalog, not the Messages API.
The snapshot id to audit
The bare alias claude-sonnet-4-5 often shows no usage. Hunt the dated snapshot in code. The recommended replacement is claude-sonnet-5-5 (Active on the same table, not sooner than 2027-09-28).
API has entered Deprecated
Anthropic's lifecycle: Active → Legacy → Deprecated (still works, not recommended, replacement + retirement date) → Retired (requests fail). In the 2026-08-28 archived copy of the deprecations page the 4.5 snapshot was still Active (not sooner than 2026-09-29); on 2026-09-30 it moved to Deprecated. Anthropic commits to at least 60 days' notice for public models; this notice ran 61 days (by the official dates, 09-30 → 11-30).
“Retirement” is not one switch
As of 2026-10-26 the Claude API retirement date for claude-sonnet-4-5-20250929 is unchanged: 2026-11-30. The same page says its dates apply to Anthropic-operated platforms (the Claude API, Claude Platform on AWS, Claude Models on Google Cloud (Anthropic managed) and Microsoft Foundry), while partner-operated platforms (Amazon Bedrock and Claude Models on Google Cloud (Google managed)) set their own retirement schedules, so status and dates can differ; that page lists no separate dates for those two platforms and only points to their own model tables. GitHub Copilot is a separate catalog: the 2026-07-31 changelog announced deprecation on 2026-09-01 across all GitHub Copilot experiences for Gemini 3.1 Pro, Claude Opus 4.5, Claude Opus 4.6, Claude Sonnet 4.5, Claude Sonnet 4.6 and Raptor Mini, with Claude Sonnet 4.6 kept for individual annual plans. Same model, two clocks: the Copilot deprecation date and the Claude API retirement date are 90 days apart (by the official dates, 09-01 → 11-30).
2026-09-30: Anthropic sends the Sonnet 4.5 retirement notice
The deprecations page reads: “On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API.” The Claude Platform release notes of the same day give 2026-11-30 as the retirement date and recommend migrating to Claude Sonnet 5.5. Projects that still hard-code the 4.5 snapshot should finish migration and regression testing before 2026-11-30 rather than in the final week.
Timeline
GitHub changelog: Upcoming August 2026 model deprecations in GitHub Copilot. Sonnet 4.5 → Claude Sonnet 5; Opus 4.5/4.6 → Opus 4.7 / 4.8 / 5. Individual annual Copilot subscribers keep Sonnet 4.6; monthly and enterprise do not.
Anthropic sends the retirement notice: claude-sonnet-4-5-20250929 becomes Deprecated, Claude API retirement 2026-11-30, recommended replacement claude-sonnet-5-5. In the 2026-08-28 archived copy of the deprecations page it was still Active, not sooner than 2026-09-29.
Claude API retirement date: requests past that date fail (Requests to models past the retirement date will fail). Bedrock and Google Cloud follow their own model tables. Re-checked on 2026-10-13: the deprecations table still shows Deprecated and 2026-11-30, which matches what this page reported on 2026-10-07, and the price list still reads Claude Sonnet 4.5 (deprecated).
Confirmed vs rumor
Confirmed
Confirmed word for word and re-checked on 2026-10-26: the Anthropic deprecations page says “On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API”; its table gives November 30, 2026 as the retirement date and claude-sonnet-5-5 as the recommended replacement, and the same page states “Requests to models past the retirement date will fail.” On the same table on 2026-10-26, claude-opus-4-5-20251101 is Active and its tentative retirement date column reads Not sooner than November 24, 2026 (an earliest bound, not a shutdown date; no actual retirement date is given), and claude-haiku-4-5-20251001 is Active with Not sooner than October 15, 2026 (also a bound, not a shutdown date). On the Copilot side: GitHub's 2026-07-31 changelog set 2026-09-01 for removing Sonnet 4.5 from Copilot, with Claude Sonnet 5 as the suggested alternative; the annual-individual Sonnet 4.6 carve-out is GitHub's own sentence.
Rumor / misread
“Sonnet 4.5 is already gone from the API” - as of 2026-10-26 it is Deprecated (still functional, no longer recommended), not Retired; retirement is 2026-11-30. “09-01 was Anthropic's retirement day” - that was Copilot. “11-30 also applies on Bedrock / Google Cloud” - the page splits Anthropic-operated and partner-operated platforms, and the latter set their own schedules. “Every Copilot user lost Sonnet 4.6 on 09-01” - annual individual plans are exempted. “It still answers on QCode as before” - on 2026-10-26 /models shows the “Retired” badge on this snapshot and warns that requests may fail, with the advice to switch to a newer model.
Migrate per product
Messages API / SDK: switch before 11-30
Export the Console Usage CSV and find claude-sonnet-4-5-20250929 by API key and model. Move to the recommended claude-sonnet-5-5 and regression-test before 2026-11-30. Partner clouds (Bedrock / Google Cloud) may differ — read those tables.
GitHub Copilot: removed on 09-01, use the changelog alternatives
Enterprise admins may need to enable Sonnet 5 / Opus 4.7+ in Copilot model policies. Changelog: no action is required to remove models once deprecated. Annual individuals who still need Sonnet 4.6 should confirm plan type.
Migration order (official mechanism)
As of 2026-11-05, three steps to take now. ① Change the model ID: replace claude-sonnet-4-5-20250929 with the recommended claude-sonnet-5-5 (Anthropic: update your code to use the recommended replacement model as soon as possible). ② Check the model list: the docs.qcode.cc model selection guide (updated 2026-10-27) lists claude-sonnet-5-5 among the Claude IDs callable on QCode, and qcode.cc/models lists it too. ③ Test: Anthropic recommends testing your applications with newer models well before the retirement date. The full sequence follows (record of 2026-10-26): ① Inventory: export the Console Usage CSV and list the keys still calling claude-sonnet-4-5-20250929. ② Change the id: the first item on the official migration checklist is “Change the model ID to claude-sonnet-5-5” (no date suffix). ③ Change parameters: the migration guide's section on moving from Sonnet 5 applies to every starting model (Every starting model needs the changes in this section) — it includes Sonnet 5.5's five breaking changes, such as forced tool use (tool_choice any / tool) returning a 400 error; this site's Sonnet 5.5 breaking-changes page walks through all five. Coming from Sonnet 4.5 adds more: thinking budget_tokens returns a 400 error on Sonnet 5.5 and must become an effort level, non-default temperature / top_p / top_k must go, assistant prefills must be replaced, and output_format moves to output_config.format. ④ Regress: finish evals on your own tasks before 2026-11-30. On Copilot the changelog announced deprecation on 09-01, a date that has passed; use the changelog's alternatives.
What this means on QCode
As of 2026-11-05, claude-sonnet-4-5-20250929 no longer appears in the model list on qcode.cc/models, while claude-sonnet-5-5 is listed. The record from 2026-10-26 follows: On 2026-10-26 the QCode /models page still lists claude-sonnet-4-5-20250929, marked “Retired”, and warns that requests may fail, with the advice to switch to a newer model. The recommended claude-sonnet-5-5 is callable on QCode and listed on /models. Migration means changing the model field to claude-sonnet-5-5 — the Anthropic endpoint stays as it is (ANTHROPIC_BASE_URL=https://api.qcode.cc/api). Two other rows that are Active on the official table are marked differently on /models: claude-haiku-4-5-20251001 shows “Retired” and claude-opus-4-5-20251101 shows “Retiring”. Billed per token; per-model rates are listed on /models. The official Claude API date is 2026-11-30, and the “Retired” badge on /models appeared before that date, so for any given day /models decides whether a call works. Copilot's separate deprecation does not change the Claude API lifecycle. To try the replacement for a few days first: Not ready for a monthly plan? Pay-as-you-go Packs start at $4 for a one-time quota you use within 7 days; if you already have a Personal Plan, add a booster pack when you need more quota.
FAQ
How many days until claude-sonnet-4-5-20250929 is retired, and is it already Deprecated?
As of 2026-11-05 about 25 days remain until 2026-11-30 (counted from the official dates); the official table still shows Deprecated, replacement claude-sonnet-5-5. The answer as of 2026-10-26: Yes. Since 2026-09-30 the official table lists it as Deprecated: still callable, not recommended, retirement date 2026-11-30, recommended replacement claude-sonnet-5-5. Re-checked 2026-10-26, the status and dates are unchanged; in the 2026-08-28 archived copy of the page it was still Active, not sooner than 2026-09-29.
Why was Copilot three months earlier?
GitHub schedules the Copilot catalog. The 2026-07-31 changelog set 09-01 across Copilot surfaces; Anthropic's page covers its API and named platforms, where retirement is 2026-11-30. The two dates are 90 days apart (by the official dates) and are allowed to diverge.
Which API id should I move to?
The recommended replacement is claude-sonnet-5-5 (the Recommended replacement column, verbatim). It is Active on the same table, not sooner than 2027-09-28, and the official price table lists $2 input / $10 output against Sonnet 4.5's $3 / $15. claude-sonnet-5 and claude-sonnet-4-6 are also still Active, but they are not Anthropic's recommendation for 4.5. Pick after your own evals; do not only rewrite the string.
Do annual Copilot individuals keep Sonnet 4.6 after 09-01?
GitHub’s words: Claude Sonnet 4.6 remains available to individual GitHub Copilot subscribers on annual plans. Monthly and enterprise are outside that sentence. Sonnet 4.5 has no matching exception.
Is it 2026-11-30 on Bedrock / Google Cloud too?
Not necessarily — it depends on the platform. The deprecations page groups the dates: Anthropic-operated platforms are the Claude API, Claude Platform on AWS, Claude Models on Google Cloud (Anthropic managed) and Microsoft Foundry; partner-operated platforms are Amazon Bedrock and Claude Models on Google Cloud (Google managed), which set their own retirement schedules, so status and dates can differ. The copy re-checked on 2026-10-26 gives no separate dates for those latter platforms and points to their model tables.
When does QCode stop Sonnet 4.5?
As of 2026-11-05 this snapshot no longer appears in the qcode.cc/models list; the official Claude API retirement date is still 2026-11-30. The answer as of 2026-10-26: Watch /models. On 2026-10-26 /models still lists claude-sonnet-4-5-20250929 with the “Retired” badge, with a note that requests may fail and to switch to a newer model, while the official table still gives 2026-11-30 for the Claude API and says requests to models past the retirement date will fail. That badge predates the official retirement date, so for any given day /models decides whether the model answers. What to do: change model to claude-sonnet-5-5 and don't leave production traffic to the final day.
Sources
Re-fetched on 2026-11-05: the model-deprecations page on platform.claude.com (Deprecated, retirement 2026-11-30, replacement claude-sonnet-5-5), qcode.cc/models and the docs.qcode.cc model selection guide. Sources as of 2026-10-26: Fetched and checked on 2026-10-26: the model deprecations page on platform.claude.com (Deprecated, notice sent September 30, 2026, retirement November 30, 2026, recommended replacement claude-sonnet-5-5, at least 60 days' notice, failed requests after retirement, the split between Anthropic-operated and partner platforms, and the Active status and floors for Opus 4.5 and Haiku 4.5), the Claude Platform release notes (the Sonnet 4.5 entry of 2026-09-30), the Model IDs and versioning page. The late-August state comes from the Wayback Machine copy of the same page captured on 2026-08-28. Copilot's 09-01 list: the model table in github.blog/changelog/2026-07-31-upcoming-august-2026-model-deprecations-in-github-copilot. The QCode-side status comes from qcode.cc/models on 2026-10-26 and the endpoints page on docs.qcode.cc.
Copilot’s catalog is moving; the API clock is the official table
Replace claude-sonnet-4-5-20250929 with claude-sonnet-5-5 before 2026-11-30; on 2026-10-26 the first is still listed on /models with the “Retired” badge and the second is callable on QCode. Billed per token; per-model rates are listed on /models.
Related
Claude Sonnet 5 guide
Copilot’s suggested alternative for Sonnet 4.5, and still Active on the API table.
GPT-5 and o3 snapshots shut down 2026-12-11
Which ID replaces each of the six GPT-5 / o3 snapshots, what to do with aliases, and a migration checklist (official table checked 2026-10-08)
Claude Haiku 4.5
Another dated row on the same table: Haiku 4.5 not sooner than 2026-10-15.
Crypto payment guide
Nine coins, 56 networks, zero platform fee for AI coding API credits.
Most recent check 2026-11-05. A reading of the public deprecation documents of Anthropic and GitHub plus what the QCode site showed on the check date — not a statement by any of them. Official pages were checked on 2026-10-26; status is whatever the official deprecations table and the Copilot changelog say, and what actually answers on QCode is what /models shows that day. QCode does not bypass vendor retirements or product policy.