Inkling-2-Small oQ3e

oQ3e enhanced-calibrated MLX conversion of Thinking Machines’ Inkling-2-Small-MXFP8 for Apple Silicon.

Effective weight storage: 3.60 BPW · 268.10 GB · group size 64.

The full expert set, vision encoder/projector, original tokenizer and chat template are retained, along with the original BF16 multi-token-prediction (MTP) sidecar. All 48 text layers retain 384 routed experts and top-8 routing.

Other precision: oQ2e.

Conversion

  • Source: published MXFP8 checkpoint, thinkingmachines/Inkling-2-Small-MXFP8@086a047e8b7ff2ac902dd52355328ddb66b16914; converted directly, not requantized from oQ2e.
  • Format: MLX safetensors; enhanced oQ3e mixed precision, affine packing, group size 64.
  • Tooling: oMLX native Inkling 2/oQe converter, PR #5229.
  • Calibration: 384 samples of 512 tokens with authentic text/image inputs; full expert coverage and fresh level-3 sensitivity measurements.
  • Weights: 49 main shards plus the MTP sidecar, 268.10 GB / 249.69 GiB.

Conversion records are in CONVERSION.json.

Mixed precision

The packed quantized matrices average 3.055 bits per weight. The 3.60 effective BPW includes quantization metadata, unquantized tensors and safetensors headers.

Component Weight precision Original scalar parameters Stored GB
Attention-residual controls FP32 516,096 0.002064
MTP / draft BF16 1,711,710,384 3.423421
Output head 8-bit 926,318,592 0.984214
Text attention 8-bit, BF16 4,713,811,968 4.862202
Text convolutions BF16 2,162,688 0.004325
Text normalization BF16 525,312 0.001051
Text routed experts 3-bit 587,068,342,272 256.842400
Text routers FP32 84,953,088 0.339812
Token embeddings 8-bit 926,318,592 0.984214
Vision encoder BF16 292,041,728 0.584083
Vision merger / projector BF16 35,651,584 0.071303
Safetensors headers — — 0.000201
Total 3.60 effective BPW 595,762,352,304 268.099290

Stored GB uses decimal units. MTP is included; no tensors are counted twice.

Calculation: 8 × 268,099,290,020 stored bytes ÷ 595,762,352,304 original scalar parameters = 3.600084 BPW. Tokenizer/config files, KV cache and runtime workspace are excluded.

Per-block precision map
Block Routed expert matrices Other quantized matrices Unquantized tensors Stored GB
Text global — 8-bit BF16, FP32 1.968464
Text 0 3-bit 8-bit BF16, FP32 5.459335
Text 1 3-bit 8-bit BF16, FP32 5.459353
Text 2 3-bit 8-bit BF16, FP32 5.459353
Text 3 3-bit 8-bit BF16, FP32 5.459353
Text 4 3-bit 8-bit BF16, FP32 5.459353
Text 5 3-bit 8-bit BF16, FP32 5.459713
Text 6 3-bit 8-bit BF16, FP32 5.459353
Text 7 3-bit 8-bit BF16, FP32 5.459353
Text 8 3-bit 8-bit BF16, FP32 5.459353
Text 9 3-bit 8-bit BF16, FP32 5.459353
Text 10 3-bit 8-bit BF16, FP32 5.459353
Text 11 3-bit 8-bit BF16, FP32 5.459713
Text 12 3-bit 8-bit BF16, FP32 5.459353
Text 13 3-bit 8-bit BF16, FP32 5.459353
Text 14 3-bit 8-bit BF16, FP32 5.459353
Text 15 3-bit 8-bit BF16, FP32 5.459353
Text 16 3-bit 8-bit BF16, FP32 5.459353
Text 17 3-bit 8-bit BF16, FP32 5.459713
Text 18 3-bit 8-bit BF16, FP32 5.459353
Text 19 3-bit 8-bit BF16, FP32 5.459353
Text 20 3-bit 8-bit BF16, FP32 5.459353
Text 21 3-bit 8-bit BF16, FP32 5.459353
Text 22 3-bit 8-bit BF16, FP32 5.459353
Text 23 3-bit 8-bit BF16, FP32 5.459713
Text 24 3-bit 8-bit BF16, FP32 5.459353
Text 25 3-bit 8-bit BF16, FP32 5.459353
Text 26 3-bit 8-bit BF16, FP32 5.459353
Text 27 3-bit 8-bit BF16, FP32 5.459353
Text 28 3-bit 8-bit BF16, FP32 5.459353
Text 29 3-bit 8-bit BF16, FP32 5.459713
Text 30 3-bit 8-bit BF16, FP32 5.459353
Text 31 3-bit 8-bit BF16, FP32 5.459353
Text 32 3-bit 8-bit BF16, FP32 5.459353
Text 33 3-bit 8-bit BF16, FP32 5.459353
Text 34 3-bit 8-bit BF16, FP32 5.459353
Text 35 3-bit 8-bit BF16, FP32 5.459713
Text 36 3-bit 8-bit BF16, FP32 5.459353
Text 37 3-bit 8-bit BF16, FP32 5.459353
Text 38 3-bit 8-bit BF16, FP32 5.459353
Text 39 3-bit 8-bit BF16, FP32 5.459353
Text 40 3-bit 8-bit BF16, FP32 5.459353
Text 41 3-bit 8-bit BF16, FP32 5.459713
Text 42 3-bit 8-bit BF16, FP32 5.459353
Text 43 3-bit 8-bit BF16, FP32 5.459353
Text 44 3-bit 8-bit BF16, FP32 5.459353
Text 45 3-bit 8-bit BF16, FP32 5.459353
Text 46 3-bit 8-bit BF16, FP32 5.459353
Text 47 3-bit 8-bit BF16, FP32 5.459713
Vision global — — BF16 0.075866
Vision 0 — — BF16 0.025197
Vision 1 — — BF16 0.025197
Vision 2 — — BF16 0.025197
Vision 3 — — BF16 0.025197
Vision 4 — — BF16 0.025197
Vision 5 — — BF16 0.025197
Vision 6 — — BF16 0.025197
Vision 7 — — BF16 0.025197
Vision 8 — — BF16 0.025197
Vision 9 — — BF16 0.025197
Vision 10 — — BF16 0.025197
Vision 11 — — BF16 0.025197
Vision 12 — — BF16 0.025197
Vision 13 — — BF16 0.025197
Vision 14 — — BF16 0.025197
Vision 15 — — BF16 0.025197
Vision 16 — — BF16 0.025197
Vision 17 — — BF16 0.025197
Vision 18 — — BF16 0.025197
Vision 19 — — BF16 0.025197
Vision 20 — — BF16 0.025197
Vision 21 — — BF16 0.025197
Vision 22 — — BF16 0.025197
MTP global — — BF16 0.120264
MTP 0 — — BF16 0.660631
MTP 1 — — BF16 0.660631
MTP 2 — — BF16 0.660631
MTP 3 — — BF16 0.660631
MTP 4 — — BF16 0.660631

Complete per-module/tensor accounting: CSV and JSON.

Running

Requires oMLX’s native Inkling 2 implementation (PR #5229, tested at 2a18263b91e14ee92ed984f8c5a56d0053178cea). Native loader: omlx.patches.inkling2.vlm.load. Keep the included processor, tokenizer, chat template and complete tiktoken/ directory; generic mlx-lm loading is not supported.

Tested successfully on a 256 GB M5 Ultra Mac with paged MLX allocations; fully memory-resident loading did not succeed.

Credits and license

Model: Thinking Machines Lab. Conversion tooling: oMLX / oQe. Community conversion: Hygaard.

Licensed under Apache-2.0. See NOTICE for attribution and modification notes.

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