OsaurusAI/Ornith-1.5-9B-MXFP8
MXFP8 MLX bundle of ornith-ai/Ornith-1.5-9B — 8-bit reference bundle; the quality baseline the JANG tiers are measured against.
Ornith 1.5 is an agentic coding / reasoning VLM built on a hybrid gated-delta linear attention + full attention backbone (3:1), with a 27-layer vision tower and native video support.
Bundle
| Field | Value |
|---|---|
| Source | ornith-ai/Ornith-1.5-9B |
| Architecture | qwen3_5 / Qwen3_5ForConditionalGeneration |
| Size on disk | 9.45 GiB |
| Layers | 32 |
| Hidden size | 4096 |
| Context | 262,144 |
| Shards | 10 |
| Quantization | uniform 8-bit mxfp8, group size 32 |
How it was quantized
Uniform 8-bit affine (group size 32). This is the reference bundle: the JANG tiers below are measured against it.
Modalities
| Modality | Status |
|---|---|
| Text | supported |
| Vision | supported — 333 vision-tower tensors, preprocessor_config.json + processor_config.json ride with the bundle |
| Video | supported — video_preprocessor_config.json present; verified end-to-end |
| Audio | not supported. The tokenizer defines `< |
Reasoning
Reasoning is ON by default — the no-kwarg generation prompt is byte-identical to enable_thinking=True and ends <|im_start|>assistant\n<think>\n.
It is toggleable, but note how: enable_thinking=False does not remove the think block, it prefills an empty closed one (<think>\n\n</think>\n\n). A parser testing merely for the presence of a <think> block will find one in both modes — test whether it has content.
There are no reasoning_effort tiers on this model family (unlike Qwen3.8). History <think> blocks are preserved unconditionally. Reasoning parser: qwen3; tool parser: qwen3_coder.
Sampling
Both presets from the vendor card are stamped into jang_config.json, and the coding preset is also written to generation_config.json so the two files agree.
Ornith 1.5 is an agentic coding model (SWE-bench Verified 79, Terminal-Bench 2.1 67.8), so this bundle defaults to the coding preset. Upstream's own
generation_config.jsonships the general numbers (temp 1.0, presence 1.5) — usesampling_modes.generalif you want parity with the vLLM/Transformers defaults.
| Preset | temp | top_p | top_k | min_p | presence | repetition |
|---|---|---|---|---|---|---|
| general | 1.0 | 0.95 | 20 | 0.0 | 1.5 | 1.0 |
| coding (default) | 0.6 | 0.95 | 20 | 0.0 | 0.0 | 1.0 |
Stop tokens: [248046, 248044] (<|im_end|>, <|endoftext|>).
Speculative decoding (MTP)
The 9B checkpoint declares mtp_num_hidden_layers: 1 but ships no mtp.* weights, so there is no MTP head to preserve (mtp_mode: metadata_only_missing_weights). Native MTP exists on the 35B-A3B member of this family.
Credits
JANG quantization by Jinho Jang — eric@osaurus.ai
Base model: ornith-ai/Ornith-1.5-9B by Ornith AI.