Model snapshot
A model snapshot is a dated model id that stays on one version until that id is retired. A short alias can be pointed at a different snapshot later, and the dated id is the one that does not move.
Last reviewed . Publisher: SunsetDiff. A source line names the day that page was read.
The rows below are copied from this site's model records. A shutdown cell is the date stored for that provider, not a date copied from another host.
OpenAI
OpenAI model pages say snapshots let you lock a specific version so performance and behavior stay consistent. The changelog records when a short slug is pointed at a new snapshot. The previous snapshot keeps its dated id.
The API backwards-compatibility note says prompting behavior between snapshots can change, and that the way to keep prompting and output consistent is to use a pinned model version.
Sources: GPT-5.6 Sol model page , OpenAI changelog , OpenAI API backwards compatibility , checked October 20, 2026.
Anthropic
Each Claude model ID is a pinned version for the life of that ID. Before the 4.6 generation, a shorter alias such as claude-sonnet-4-5 points at the most recent dated snapshot. A 4.6-generation id such as claude-sonnet-4-6 is the snapshot, not an alias.
Weights stay fixed for an ID. Serving pieces such as the router, safety classifiers, and sampling logic can still change.
Source: Claude model IDs and versioning , checked October 20, 2026.
Gemini API, Vertex AI, and Azure
A Gemini stable name points at one stable model and usually does not change. A latest name is an alias that can be swapped. That split is the naming note on the Gemini models page.
Vertex lists a model id and a retirement date for that id. The page read on October 22, 2026 does not describe a latest alias.
On Azure you call a deployment. The deployment has a model version. A specific version stays selected until you change it or until that version's retirement date. Azure's lifecycle article calls a dated release, such as gpt-4o 2024-05-13, a model version.
Sources: Gemini API models , Vertex model versions , Foundry Models lifecycle , Working with Azure OpenAI models , checked October 22, 2026.
Rows from this dataset
Dataset rows for a short id and a dated id of the same family. The dated id is the snapshot.
| Model | Provider | Stored status | Shutdown | Replacement |
|---|---|---|---|---|
| gpt-4o | OpenAI | active | Not published | Not published |
| gpt-4o-2024-05-13 | OpenAI | deprecated | 2026-10-23 | gpt-5.6-sol · diff |
| gpt-5.6-sol | OpenAI | active | Not published | Not published |
| claude-sonnet-4-5-20250929 | Anthropic | deprecated | 2026-11-30 | claude-sonnet-5-5 · diff |
| claude-sonnet-4-6 | Anthropic | active | Not sooner than 2027-02-17 | Not published |
gpt-4o (2024-05-13) gpt-4o-2024-05-13 | Azure OpenAI | deprecated | 2026-12-09 | gpt-5.6-sol · diff |