Model Tracker

SAM 2.1

SAM 2.1 is an AI model made by Meta. It is generally available. Its weights are open. Its licence is Apache 2.0.

Released: Not confirmed: two readings disagree: 2024-09-29 and 2024-09-30
Status: Generally available — github.com, read 16 October 2026
Takes: Image, Video — github.com, read 16 October 2026
Returns: Not confirmed: two readings disagree: image, video and image
Open weights: Yes — github.com, read 16 October 2026
Licence: Apache 2.0 — github.com, read 16 October 2026
Context window: Not confirmed: The official SAM 2.1 pages reviewed do not state a context-window size in tokens.
Longest answer: Not confirmed: The official SAM 2.1 pages reviewed do not state a standard maximum output length in tokens.
Knowledge cutoff: Not confirmed: The official SAM 2.1 pages reviewed do not state a knowledge-cutoff date.
API price, input: Not confirmed: The official pages reviewed do not publish a standard API input price per 1 million tokens.
API price, output: Not confirmed: The official pages reviewed do not publish a standard API output price per 1 million tokens.
Where: Not confirmed: two readings disagree: weights, cloud and weights, api
Parameters: Not confirmed: The official checkpoint table lists four variants and their sizes in millions, but does not state a single parameter count for SAM 2.1 as a whole.
Model card: https://github.com/facebookresearch/sam2 — github.com, read 16 October 2026

Questions

Yes: it is generally available, as Meta states it.

Yes: Meta publishes the weights of SAM 2.1 for download.

The licence of SAM 2.1 is Apache 2.0, as Meta names it.