bitnet-b1.58-2b-4t

A Core AI bundle of microsoft/bitnet-b1.58-2B-4T for the Aether SDK (iOS and macOS 27+).

• Source: microsoft/bitnet-b1.58-2B-4T at revision 04c3b9ad9361b824064a1f25ea60a8be9599b127, licence MIT. The licence is included as LICENSE.
• Changes from the source: converted from PyTorch to Core AI (.aimodel) by Aether forge (recipe bitnet-b1.58-2b-4t@1). Weights are int8-linear-perchannel (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)	bitnet_b1_58_2b_4t.aimodel 2.42 GB	2.42 GB
ios-any-gpu	ios	any	gpu	no (specialized on first load)	bitnet_b1_58_2b_4t.aimodel 2.42 GB	2.42 GB
ios-h18p-gpu	ios	h18p	gpu	yes	bitnet_b1_58_2b_4t.h18p.aimodelc 2.42 GB	2.42 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	5417ccda
ios-any-gpu	T2	pass	19/19 strict; profile quantized-8bit; fixture 71736ee9acc69fd0	iPhone18,2	24A446	target	c7014699
ios-h18p-gpu	T0	pass		iPhone18,2	24A446	target	5f91bbca
ios-h18p-gpu	T2	pass	19/19 strict; profile quantized-8bit; fixture 71736ee9acc69fd0	iPhone18,2	24A446	target	6435bf43
macos-any-gpu	T0	pass		Mac17,6	26A434	target	16c37e56
macos-any-gpu	T1	pass		Mac17,6	26A434	target	235ebbf7
macos-any-gpu	T2	pass	19/19 strict; 19/19 strict; profile quantized-8bit; fixture 71736ee9acc69fd0	Mac17,6	26A434	target	a359dd63
unquantized reference (not published)	T2	pass	19/19 strict; 19/19 strict; profile strict; fixture 71736ee9acc69fd0	Mac17,6	26A434	target	3b8f311c

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

Use

aether run bitnet-b1.58-2b-4t --prompt "Hello"

import Aether

let aether = try Aether()
let chat = try await aether.chat("bitnet-b1.58-2b-4t")
let reply = try await chat.respond(to: "Hello")
print(reply.text)