---
license: apache-2.0
base_model: Zyphra/Zamba2-1.2B-Instruct-v2
pipeline_tag: text-generation
tags:
- aether
- core-ai
- apple
- macos
- ios
---

# zamba2-1.2b-instruct

A Core AI bundle of [Zyphra/Zamba2-1.2B-Instruct-v2](https://huggingface.co/Zyphra/Zamba2-1.2B-Instruct-v2) for the Aether SDK (iOS and macOS 27+).

- **Source:** `Zyphra/Zamba2-1.2B-Instruct-v2` at revision `960222dd212c071e2b7e3734573ee5297b1c075d`, licence Apache-2.0.
  The licence is included as `LICENSE`. `Zyphra/Zamba2-1.2B-Instruct-v2` declares apache-2.0 in its model card but ships no licence file; `LICENSE` is the canonical text from apache.org.
- **Changes from the source:** converted from PyTorch to Core AI (`.aimodel`) by Aether forge (recipe
  `zamba2-1.2b-instruct@1`). Weights are int8-linear-perblock32 (8-bit weights). The tokenizer files are the source's own.

## Variants

| Variant | Platform | Arch | Compute | Compiled | Assets | Download |
|---|---|---|---|---|---|---|
| `macos-any-gpu` | macos | any | gpu | no (specialized on first load) | `zamba2_1_2b_instruct.aimodel` 1.29 GB | 1.3 GB |
| `ios-any-gpu` | ios | any | gpu | no (specialized on first load) | `zamba2_1_2b_instruct.aimodel` 1.29 GB | 1.3 GB |

## Verification

Every row is a record in `verification/` about exactly these bytes (matched by bundle digest). Reference rows
are strict T2 passes of the unquantized export on the same fixture, in `verification/reference/`.

| Variant | Tier | Result | Detail | Device | OS build | Compute | Record |
|---|---|---|---|---|---|---|---|
| `ios-any-gpu` | T0 | pass |  | iPhone18,2 | 24A446 | target | `31aefeaf` |
| `ios-any-gpu` | T2 | pass | 20/20 strict; profile quantized-8bit; fixture `adbdef8a32ca3c1b` | iPhone18,2 | 24A446 | target | `dd9e2cec` |
| `ios-any-gpu` | T3 | pass | `copy-fidelity-v1`; 80.0% vs reference 80.0%; 50 items | iPhone18,2 | 24A446 | target | `8aefdd45` |
| `macos-any-gpu` | T0 | pass |  | Mac17,6 | 26A434 | target | `f11695a8` |
| `macos-any-gpu` | T1 | pass |  | Mac17,6 | 26A434 | target | `cc6fad7c` |
| `macos-any-gpu` | T2 | pass | 20/20 strict; 20/20 strict; profile quantized-8bit; fixture `adbdef8a32ca3c1b` | Mac17,6 | 26A434 | target | `693a2248` |
| `macos-any-gpu` | T3 | pass | `gsm8k-test-500`; 40.4% vs reference 40.4%; 500 items | Mac17,6 | 26A434 | target | `4722db3c` |
| `macos-any-gpu` | T3 | pass | `copy-fidelity-v1`; 80.0% vs reference 80.0%; 50 items | Mac17,6 | 26A434 | target | `b0bf808b` |
| unquantized reference (not published) | T2 | pass | 20/20 strict; 20/20 strict; profile strict; fixture `adbdef8a32ca3c1b` | Mac17,6 | 26A434 | target | `b307cd38` |

The quantized profile also requires: T2 strict on the unquantized reference export (met by the reference row).

## Use

```sh
aether run zamba2-1.2b-instruct --prompt "Hello"
```

```swift
import Aether

let aether = try Aether()
let chat = try await aether.chat("zamba2-1.2b-instruct")
let reply = try await chat.respond(to: "Hello")
print(reply.text)
```