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# Modifications to upstream Qwen material

This distribution contains files modified by JetBrains from Qwen models developed by Alibaba Cloud. This document records the modifications and identifies the affected model files; it accompanies the binary artifacts listed below.

## Base model merge

The base model is a 50/50 combination of Qwen3.6-27B and Qwen3.8-27B, created by linearly interpolating their checkpoint parameters. The configuration, tokenizer, processor, and chat template are retained from Qwen3.8-27B. Exact source revisions and merge settings are recorded in [merge-manifest.json](merge-manifest.json).

The interpolation uses float32 accumulation. Upstream sources:

- [Qwen/Qwen3.6-27B](https://huggingface.co/Qwen/Qwen3.6-27B/tree/6a9e13bd6fc8f0983b9b99948120bc37f49c13e9), revision `6a9e13bd6fc8f0983b9b99948120bc37f49c13e9`, weight 0.5.
- [Qwen/Qwen3.8-27B](https://huggingface.co/Qwen/Qwen3.8-27B/tree/1d4bf0f2ff6012fd82039f2fa52739d0dd7c60c0), revision `1d4bf0f2ff6012fd82039f2fa52739d0dd7c60c0`, weight 0.5.

## Distribution-specific changes

The merged checkpoint was converted to GGUF and quantized to IQ3_S, Q4_K_M, and Q5_K_M from one BF16 intermediate, without an importance matrix. Each main GGUF retains the native MTP head. The vision encoder and projector were converted to a separate BF16 GGUF. Published filenames were updated to the JetBrains blend name.

Exact conversion settings and runtime versions are recorded in [conversion-manifest.json](conversion-manifest.json). Historical source identifiers in the manifests are retained for reproducibility.

## Modified model artifacts

The following files contain the merged parameters and, where applicable, the format conversions described above. SHA-256 values identify the binaries to which this modification notice applies.

| File | SHA-256 |
|---|---|
| `Qwen3.8-3.6-27B-blend-IQ3_S.gguf` | `94cc60e6ba6150003ae956d5a98c3914e8d9fe18ecafc3fe400e00232c8cecd2` |
| `Qwen3.8-3.6-27B-blend-Q4_K_M.gguf` | `5f54ded85a78f11ad7a1c02d17564a268238ac8afe9b3d94fb0b614e473006a1` |
| `Qwen3.8-3.6-27B-blend-Q5_K_M.gguf` | `d095b2807e5b120b57caf6a6c4bfeddf17f3ebf605279a64fe3a0fcb98722ba0` |
| `mmproj-Qwen3.8-3.6-27B-blend-BF16.gguf` | `4568f7e9f79ef5b942be9acc8be717156482d0659a6fde111df660f57a1875c8` |

## Documentation and attribution — 2026-09-15

Model cards and repository references were adapted for the JetBrains distribution. The model cards now prominently identify this release as an unofficial JetBrains derivative and disclose the absence of Alibaba affiliation or endorsement. NOTICE and this modification record were added. This documentation update does not alter model artifacts, runtime configuration, or provenance manifests.

The original Qwen LICENSE and Alibaba Cloud copyright notice are retained unchanged. Neither pinned upstream source contains a NOTICE file; this distribution's NOTICE was added by JetBrains.

Copyright © 2026 JetBrains s.r.o. applies only to original material contributed by JetBrains. Upstream Qwen material remains subject to its original copyright and attribution notices. See [LICENSE](LICENSE) and [NOTICE](NOTICE).