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Swift-Qwen3.8-27B-GGUF
ukisai/Swift-Qwen3.8-27B-GGUF
Swift-Qwen3.8-27B-GGUF is a image-text-to-text model from ukisai. Use it for the image-text-to-text task on the model card, and read the license before you ship it in a product. It is set up for gguf. The card lists the license as other.
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At a glance
- Task
- Image-Text-to-Text
- Library
- gguf
- License
- other
- Access
- Public
- Created
- Sep 11, 2026
- Updated
- Oct 1, 2026
- SHA
- 98a61007
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Base models
Model card
From the Hugging Face model README
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Swift-Qwen3.8-27B GGUF
Swift-Qwen3.8-27B is UkisAI's reasoning-efficient derivative of Qwen3.8-27B, using 58.3% fewer thinking tokens while maintaining near-identical performance (<1% loss) and as a result getting a x1.95 speed-up on several tasks.
<video controls autoplay muted loop playsinline style="width:100%;max-width:100%;height:auto;display:block;border-radius:12px;margin:0.8em 0 1.4em;" src="https://huggingface.co/ukisai/Swift-Qwen3.8-27B-GGUF/resolve/main/swift-speed-demo.mp4"></video>
<p align="center" style="font-size:13px;color:#8C94A8;margin:-0.6em 0 1.4em;">The prompt is a sample from LiveCodeBench v6</p> <style> .swift-table { width:100%; table-layout:fixed; border-collapse:separate; border-spacing:0; overflow:hidden; border:1px solid #27344A; border-radius:20px; background:#0D111B; font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; font-size:14px; color:#BFBDBD; } .swift-table th { padding:13px 8px; text-align:center; font-weight:700; color:#AEB5C7; background:#0D111B; border-right:1px solid #27344A; border-bottom:1px solid #27344A; } .swift-table td { padding:14px 8px; text-align:center; color:#BFBDBD; background:#0D111B; border-right:1px solid #27344A; border-bottom:1px solid #27344A; vertical-align:middle; overflow-wrap:break-word; } .swift-table tr > :last-child { border-right:0; } .swift-table tbody tr:last-child td { border-bottom:0; } .swift-table .benchmark-heading { color:#B7BDCD; background:#0D111B; border-bottom:3px solid #7D45B5; } .swift-table .score-heading { color:#F0C5FF; background:#52239E; border-bottom:3px solid #7D45B5; } .swift-table .tokens-heading, .swift-table .median-heading { color:#D4E8FF; background:#304FC2; border-bottom:3px solid #5687E6; } .swift-table .benchmark { padding-left:18px; text-align:left; color:#FFFFFF; font-weight:600; } .swift-table strong { color:#FFFFFF; } .swift-table .section { padding:12px 18px; text-align:left; color:#B489FF; background:#2A2541; font-weight:700; letter-spacing:.08em; text-transform:uppercase; border-top:1px solid #3A3159; border-bottom:1px solid #3A3159; } .swift-table .swift { background:#171127; } .swift-table thead tr:nth-child(2) .swift { color:#D3A0FF; } .swift-table .reduction { color:#69BFFF; background:#101B2C; font-weight:700; } .swift-table .detail { color:#8C94A8; font-size:12px; font-weight:500; } @media (max-width: 640px) { .swift-table { display:block !important; width:100% !important; max-width:100%; overflow-x:auto !important; -webkit-overflow-scrolling:touch; table-layout:auto !important; } .swift-table th, .swift-table td { min-width:100px; } .swift-table th:first-child, .swift-table td:first-child { min-width:160px; } } </style>Evaluation scope
All results below compare the Qwen3.8-27B BF16 base with the same base plus the Swift adapter.
Benchmarks
<table class="swift-table"> <thead> <tr> <th rowspan="2" class="benchmark-heading" style="width:32%;text-align:left;padding-left:18px;vertical-align:bottom;">Benchmark</th> <th colspan="2" class="score-heading">Score</th> <th colspan="3" class="tokens-heading">Mean tokens</th> <th class="median-heading" style="width:14%;">Median tokens</th> </tr> <tr> <th>Base</th> <th class="swift">Swift</th> <th>Base</th> <th class="swift">Swift</th> <th class="reduction">Reduction</th> <th class="reduction">Reduction</th> </tr> </thead> <tbody> <tr><td class="section" colspan="7">General reasoning</td></tr> <tr><td class="benchmark">GPQA-Diamond</td><td>88.38%</td><td class="swift">88.28%</td><td>15,014</td><td class="swift"><strong>8,855</strong></td><td class="reduction">↓ 41.0%</td><td class="reduction">↓ 58.3%</td></tr> <tr><td class="benchmark">MMLU-Pro</td><td>85.47%</td><td class="swift">84.95%</td><td>2,980</td><td class="swift"><strong>1,603</strong></td><td class="reduction">↓ 46.2%</td><td class="reduction">↓ 28.3%</td></tr> <tr><td class="benchmark">C-Eval</td><td>90.00%</td><td class="swift">90.62%</td><td>1,492</td><td class="swift"><strong>804</strong></td><td class="reduction">↓ 46.1%</td><td class="reduction">↓ 19.3%</td></tr> <tr><td class="benchmark">IFBench</td><td>73.53%</td><td class="swift">71.80%</td><td>8,052</td><td class="swift"><strong>4,657</strong></td><td class="reduction">↓ 42.2%</td><td class="reduction">↓ 50.5%</td></tr> <tr><td class="section" colspan="7">Mathematics</td></tr> <tr><td class="benchmark">AIME 2026</td><td>98.67%</td><td class="swift">94.00%</td><td>22,014</td><td class="swift"><strong>16,143</strong></td><td class="reduction">↓ 26.7%</td><td class="reduction">↓ 50.2%</td></tr> <tr><td class="benchmark">HMMT (Nov 2025)</td><td>99.33%</td><td class="swift">96.00%</td><td>22,032</td><td class="swift"><strong>15,189</strong></td><td class="reduction">↓ 31.1%</td><td class="reduction">↓ 45.9%</td></tr> <tr><td class="section" colspan="7">Multimodal</td></tr> <tr><td class="benchmark">ERQA</td><td>67.45%</td><td class="swift">66.30%</td><td>4,137</td><td class="swift"><strong>2,045</strong></td><td class="reduction">↓ 50.6%</td><td class="reduction">↓ 54.6%</td></tr> <tr><td class="section" colspan="7">Agentic coding</td></tr> <tr><td class="benchmark">Terminal-Bench 2.1</td><td>66.74%</td><td class="swift">65.84%</td><td>37,086</td><td class="swift"><strong>27,272</strong></td><td class="reduction">↓ 26.5%</td><td class="reduction">↓ 38.7%</td></tr> <tr><td class="benchmark">LiveCodeBench v6</td><td>76.76%</td><td class="swift">81.55%</td><td>11,374</td><td class="swift"><strong>8,615</strong></td><td class="reduction">↓ 24.3%</td><td class="reduction">↓ 45.8%</td></tr> </tbody> </table> <details> <summary><strong>How to reproduce</strong></summary> <p style="font-size:13px;line-height:1.5;margin:8px 0;"><strong>Serving:</strong> BF16 · vLLM 0.27.1 · Qwen3 parser · context 262,144 · thinking xhigh.<br> <strong>Sampling:</strong> temperature 1.0 · top_p 0.95 · top_k 20 · min_p 0 · presence_penalty 0 · repetition_penalty 1.<br> <strong>Benchmarks:</strong> averages over five seeds (0–4) per model; five trials per task for Terminal-Bench.</p> <table style="display:table;width:100%;border-collapse:collapse;font-size:13px;line-height:1.3;margin:8px 0;"> <thead><tr><th style="padding:4px 8px;text-align:left;">Benchmark</th><th style="padding:4px 8px;text-align:right;">Output cap</th></tr></thead> <tbody> <tr><td style="padding:3px 8px;">GPQA-Diamond</td><td style="padding:3px 8px;text-align:right;">100,000</td></tr> <tr><td style="padding:3px 8px;">MMLU-Pro</td><td style="padding:3px 8px;text-align:right;">100,000</td></tr> <tr><td style="padding:3px 8px;">C-Eval</td><td style="padding:3px 8px;text-align:right;">16,384</td></tr> <tr><td style="padding:3px 8px;">IFBench</td><td style="padding:3px 8px;text-align:right;">81,920</td></tr> <tr><td style="padding:3px 8px;">AIME 2026</td><td style="padding:3px 8px;text-align:right;">250,000</td></tr> <tr><td style="padding:3px 8px;">HMMT Nov 2025</td><td style="padding:3px 8px;text-align:right;">250,000</td></tr> <tr><td style="padding:3px 8px;">ERQA</td><td style="padding:3px 8px;text-align:right;">100,000</td></tr> <tr><td style="padding:3px 8px;">Terminal-Bench 2.1</td><td style="padding:3px 8px;text-align:right;">Agent/task limits</td></tr> <tr><td style="padding:3px 8px;">LiveCodeBench v6</td><td style="padding:3px 8px;text-align:right;">32,768</td></tr> </tbody> </table> </details>Quantized evaluations
Quantized deployment is the intended use for Swift: lower-memory weights paired with shorter reasoning. The INT4 evaluations below come from the source model card and were run on W4A16 and AWQ checkpoints, not on this F16 GGUF. They retain token savings across GPQA, IFBench, and AIME. On AIME, Swift matches or improves accuracy and reduces output-cap failures by 31–33%.
<table class="swift-table" style="display:table;width:100%;table-layout:fixed;"> <thead><tr> <th class="benchmark-heading" style="width:32%;text-align:left;padding-left:18px;white-space:normal;">Benchmark / quantization</th> <th class="score-heading" style="width:16%;white-space:normal;">Base accuracy</th> <th class="score-heading" style="width:16%;white-space:normal;">Swift accuracy</th> <th class="tokens-heading" style="width:18%;white-space:normal;">Mean token reduction</th> <th class="median-heading" style="width:18%;white-space:normal;">Median token reduction</th> </tr></thead> <tbody> <tr><td class="benchmark">GPQA-Diamond<br><span class="detail">Mixed-precision quant W4A16 · thinking tokens</span></td><td>88.69%</td><td class="swift">88.38%</td><td class="reduction">↓ 32.1%</td><td class="reduction">↓ 50.2%</td></tr> <tr><td class="benchmark">IFBench<br><span class="detail">Mixed-precision quant W4A16 · completion tokens</span></td><td>72.58%</td><td class="swift">71.25%</td><td class="reduction">↓ 30.1%</td><td class="reduction">↓ 38.0%</td></tr> <tr><td class="benchmark">AIME 2026<br><span class="detail">Mixed-precision quant W4A16 · completion tokens</span></td><td>84.00%</td><td class="swift">84.00%</td><td class="reduction">↓ 19.0%</td><td class="reduction">↓ 37.5%</td></tr> <tr><td class="benchmark">AIME 2026<br><span class="detail">AWQ INT4 · completion tokens</span></td><td>82.67%</td><td class="swift">84.00%</td><td class="reduction">↓ 22.8%</td><td class="reduction">↓ 34.8%</td></tr> </tbody> </table> <details> <summary><strong>Quantized evaluation settings</strong></summary>Each row compares the same quantized base with and without the Swift adapter. GPQA and AIME use five seeds; IFBench uses four samples per prompt and strict scoring. Output caps: GPQA 100,000; IFBench 81,920; AIME 32,768. GPQA and IFBench use saved historical base runs. AIME uses template-default effort and counts truncated answers as incorrect. Its shorter cap makes it a separate comparison from the BF16 table.
</details>GGUF quantizations
<table class="swift-table" style="display:table;width:100%;table-layout:fixed;"> <thead><tr> <th class="benchmark-heading" style="width:20%;text-align:left;padding-left:18px;white-space:normal;">File</th> <th class="score-heading" style="width:12%;white-space:normal;">Size</th> <th class="score-heading" style="width:17%;white-space:normal;">KLD wikitext @512</th> <th class="tokens-heading" style="width:17%;white-space:normal;">KLD wikitext @32k</th> <th class="tokens-heading" style="width:17%;white-space:normal;">KLD held-out @32k</th> <th class="median-heading" style="width:17%;white-space:normal;">Top-p @32k</th> </tr></thead> <tbody> <tr><td class="benchmark">Q8_0</td><td>29.1 GB</td><td class="swift">0.0009</td><td class="reduction">0.0035</td><td class="reduction">0.0579</td><td>97.92%</td></tr> <tr><td class="benchmark">Q6_K_L<br><span class="detail">new tier</span></td><td>25.2 GB</td><td>0.0015</td><td class="reduction">—</td><td class="reduction">—</td><td>98.24%</td></tr> <tr><td class="benchmark">Q6_K_S<br><span class="detail">new tier</span></td><td>23.1 GB</td><td>0.0018</td><td class="reduction">—</td><td class="reduction">—</td><td>98.09%</td></tr> <tr><td class="benchmark">Q6_K</td><td>22.9 GB</td><td>0.0020</td><td class="reduction">0.0069</td><td class="reduction">0.0782</td><td>96.85%</td></tr> <tr><td class="benchmark">Q5_K_M</td><td>20.2 GB</td><td>0.0056</td><td class="reduction">0.0135</td><td class="reduction">0.1251</td><td>95.60%</td></tr> <tr><td class="benchmark">Q5_K_S<br><span class="detail">new tier</span></td><td>19.8 GB</td><td>0.0057</td><td class="reduction">—</td><td class="reduction">—</td><td>96.70%</td></tr> <tr><td class="benchmark">Q4_K_L<br><span class="detail">new tier</span></td><td>19.0 GB</td><td>0.0102</td><td class="reduction">—</td><td class="reduction">—</td><td>95.77%</td></tr> <tr><td class="benchmark">Q4_K_M</td><td>18.0 GB</td><td>0.0120</td><td class="reduction">0.0211</td><td class="reduction">0.1496</td><td>94.30%</td></tr> <tr><td class="benchmark">IQ4_NL<br><span class="detail">new tier</span></td><td>17.6 GB</td><td>0.0141</td><td class="reduction">—</td><td class="reduction">—</td><td>95.11%</td></tr> <tr><td class="benchmark">Q4_1<br><span class="detail">new tier</span></td><td>17.5 GB</td><td>0.0194</td><td class="reduction">—</td><td class="reduction">—</td><td>94.09%</td></tr> <tr><td class="benchmark">Q4_K_S<br><span class="detail">new tier</span></td><td>16.6 GB</td><td>0.0150</td><td class="reduction">—</td><td class="reduction">—</td><td>94.95%</td></tr> <tr><td class="benchmark">Q4_0<br><span class="detail">new tier</span></td><td>16.0 GB</td><td>0.0278</td><td class="reduction">—</td><td class="reduction">—</td><td>92.59%</td></tr> <tr><td class="benchmark">IQ4_XS<br><span class="detail">new tier</span></td><td>15.7 GB</td><td>0.0165</td><td class="reduction">—</td><td class="reduction">—</td><td>94.66%</td></tr> <tr><td class="benchmark">IQ3_M<br><span class="detail">new tier</span></td><td>15.1 GB</td><td>0.0390</td><td class="reduction">—</td><td class="reduction">—</td><td>91.76%</td></tr> <tr><td class="benchmark">Q3_K_L<br><span class="detail">new tier</span></td><td>14.3 GB</td><td>0.0412</td><td class="reduction">—</td><td class="reduction">—</td><td>91.26%</td></tr> <tr><td class="benchmark">Q3_K_M<br><span class="detail">new tier</span></td><td>13.6 GB</td><td>0.0552</td><td class="reduction">—</td><td class="reduction">—</td><td>89.91%</td></tr> <tr><td class="benchmark">IQ3_XS<br><span class="detail">new tier</span></td><td>13.0 GB</td><td>0.0555</td><td class="reduction">—</td><td class="reduction">—</td><td>89.91%</td></tr> <tr><td class="benchmark">Q3_K_S<br><span class="detail">new tier</span></td><td>12.9 GB</td><td>0.0631</td><td class="reduction">—</td><td class="reduction">—</td><td>89.30%</td></tr> <tr><td class="benchmark">IQ3_XXS<br><span class="detail">new tier</span></td><td>12.5 GB</td><td>0.0724</td><td class="reduction">—</td><td class="reduction">—</td><td>88.81%</td></tr> <tr><td class="benchmark">Q2_K<br><span class="detail">new tier</span></td><td>11.0 GB</td><td>0.1617</td><td class="reduction">—</td><td class="reduction">—</td><td>84.05%</td></tr> <tr><td class="benchmark">IQ2_M<br><span class="detail">new tier</span></td><td>10.7 GB</td><td>0.1469</td><td class="reduction">—</td><td class="reduction">—</td><td>84.47%</td></tr> <tr><td class="benchmark">IQ2_S<br><span class="detail">new tier</span></td><td>9.9 GB</td><td>0.2060</td><td class="reduction">—</td><td class="reduction">—</td><td>81.29%</td></tr> <tr><td class="benchmark">IQ2_XS<br><span class="detail">new tier</span></td><td>9.3 GB</td><td>0.2354</td><td class="reduction">—</td><td class="reduction">—</td><td>80.04%</td></tr> <tr><td class="benchmark">IQ2_XXS<br><span class="detail">new tier</span></td><td>9.1 GB</td><td>0.2852</td><td class="reduction">—</td><td class="reduction">—</td><td>78.09%</td></tr> </tbody> </table>Mean KL divergence against the BF16 source, lower is better. Tiers marked new tier were added on 2026-09-13 and carry the wikitext @512 measurement and 512-token top-token agreement; their 32k columns will be filled as those runs complete. wikitext is wikitext-2 test; held-out
is our own chat and long-document set, reserved before the importance matrix was fitted. Top-p is
top-token agreement with BF16 at 32k on the held-out set.
Read the two 32k columns together. On this hybrid architecture (48 of 64 blocks are recurrent), a
small fraction of positions (about 0.1%) diverge sharply at long context for every tier, including Q8_0,
and the same is true of the public Q4_K_M and Q8_0 builds of the base Qwen3.8-27B measured on the same
harness. Those rare positions dominate the held-out mean; the median divergence at 32k is within 10% of the
512-token value for every tier. Typical-token quality does not degrade with context. The pick below follows
the 99th-percentile tail on the held-out set: 2.60 for Q4_K_M, 1.75 for Q5_K_M, 0.46 for Q6_K,
0.23 for Q8_0.
All tiers use the same importance matrix (8,016 chunks of domain, prompt and long-document text) and pin
the recurrent gate projections ssm_alpha and ssm_beta to F32 and the MTP head to Q8_0. Q4_K_M
additionally lifts ssm_out, attn_gate, output and token_embd to Q6_K; Q5_K_M and Q6_K lift
attn_gate to Q8_0. The lifts cost about 1.1 GB on Q4_K_M and reduce its KL divergence by roughly 20%
against a plain llama.cpp Q4_K_M of the same model.
The tiers added on 2026-09-13 (IQ2_XXS through Q6_K_L) use the same importance matrix and the same
ssm_alpha/ssm_beta F32 and MTP Q8_0 pins, with per-tensor type layouts computed for this model by
bartowski's quantization-config instead of
llama.cpp's built-in heuristic (--tensor-type-file). Q4_K_L, Q6_K_S and Q6_K_L are the large and
small layouts of Q4_K_M and Q6_K. All files were built with llama.cpp release b10896 from a BF16
conversion of the published safetensors and checked against BF16 on the harness above.
KV cache
Only 16 of the 64 blocks are full attention, so the cache stays small for a 27B:
16 layers x 4 kv-heads x 256 head_dim x 2 (K+V) x 2 bytes = 64 KiB per token
Training approach
We built Swift by identifying reasoning-marker tokens that, in our analysis, trigger overthinking in Qwen’s reasoning rollouts. We then fine-tuned Qwen by penalizing usage of those tokens while it reasons.
Swift produces shorter reasoning traces. In our testing, we also observe fewer overthinking errors.
For maximum gains, Swift also includes a transfer component derived from BottleCap AI's ThinkingCap-Qwen3.6-27B.
How to use
llama.cpp
These files run with llama.cpp, installable in one line via llama.app.
The command below is the llama.cpp counterpart of the vLLM configuration on the source card: full
262,144 context, thinking on at reasoning effort xhigh, reasoning and tool calls parsed from the
embedded chat template, and Qwen3.8's thinking-mode sampling.
curl -LsSf https://llama.app/install.sh | sh
llama-server -hf ukisai/Swift-Qwen3.8-27B-GGUF:Q4_K_M \
--jinja -fa on -ngl 99 \
-c 262144 \
--temp 1.0 --top-p 0.95 --top-k 20 --min-p 0 \
--presence-penalty 0 --repeat-penalty 1.0 \
--port 8000
llama-server exposes an OpenAI-compatible API and a built-in chat web UI on the port above.
Swap Q4_K_M for any tier in the table above (IQ2_XXS up to Q8_0) or F16; -hf fetches the tier and
the vision projector automatically. The KV cache costs 64 KiB per token (16 GB at the full
262,144 context), so lower -c if it does not fit. Use a recent llama.cpp release with
Qwen3.5/Qwen3.8 architecture support. The same sampling values are stored in the GGUF header
and xhigh is the template default; the flags above make the configuration explicit.
They also work in LM Studio, koboldcpp and Jan AI. In those apps set the same sampling values by hand and a context length of at least 65,536 tokens; the default 4,096-token window overflows on long reasoning and looks like an endless loop.
Multimodal
This model supports image input. Alongside the quants, this repo includes the multimodal
projector file mmproj-Swift-Qwen3.8-27B-F16.gguf,
which pairs with any tier above. llama.cpp downloads the mmproj automatically when using
-hf as shown above; if you are loading files manually, pass it with --mmproj.
MTP
This model has MTP (Multi-Token Prediction) layers, and they are included in every tier, stored at Q8_0. MTP layers act as a built-in draft model, letting llama.cpp run speculative decoding for faster generation. To use them, add the following flag to your llama.cpp command:
--spec-type draft-mtp --spec-draft-n-max 3
This is the counterpart of the vLLM --speculative-config '{"method":"mtp","num_speculative_tokens":3}' option.
Ollama
ollama create swift -f <(curl -fsSL https://huggingface.co/ukisai/Swift-Qwen3.8-27B-GGUF/resolve/main/Modelfile) && ollama run swift
Use Ollama 0.33 or newer. The Modelfile
in this repo pulls the Q4_K_M tier together with the vision projector, applies the sampling
values above, and sets Ollama's built-in Qwen3.8 renderer and parser, which separate reasoning
from the answer and parse tool calls. Swift's embedded chat template is identical to Qwen3.8's.
For another tier, download the Modelfile, change the tag after FROM, and run
ollama create swift -f Modelfile.
ollama run hf.co/ukisai/Swift-Qwen3.8-27B-GGUF:Q4_K_M also works without a Modelfile. It
runs the embedded chat template through llama.cpp and reads the sampling values from the
params file.
Hugging Face cannot set Ollama's renderer and parser, so in this mode reasoning may appear
inline with the answer.
Ollama sizes the context window from VRAM: 262,144 tokens with 48 GB or more, 32,768 with
24 GB, and 4,096 below that, which is too short for long reasoning. To raise it, start the
server with OLLAMA_CONTEXT_LENGTH=65536 ollama serve or run /set parameter num_ctx 65536
in the chat. To use the MTP layers, run /set parameter draft_num_predict 3.
UkisAI API
If you would rather not run the weights yourself, Swift is served through an
OpenAI-compatible API at https://ukisai.com/api/swift/v1. It is free for research
purposes and needs no API key. The model id is swift.
curl https://ukisai.com/api/swift/v1/chat/completions \
-H "Content-Type: application/json" \
-d '{"model": "swift", "messages": [{"role": "user", "content": "Hello, Swift."}]}'
Validation
The converted files passed a finite-tensor check and a CPU text-generation smoke test. Multimodal generation and the full benchmark suite have not been re-evaluated on this GGUF release. The results above and on the source model card come from the BF16 and INT4 checkpoints named there, not from these files.
License and access
Swift weights are distributed through gated access under the Swift Open License v1.0. Personal, research, educational, evaluation, and commercial use are free for individuals and organizations with annual recurring revenue, including affiliates, of up to US$1,000,000. Above that threshold, commercial use requires a separate Swift Enterprise License. Contact UkisAI for terms.
Citation
@misc{swift-qwen3.8-27b,
title = {Swift-Qwen3.8-27B},
author = {UkisAI},
year = {2026},
url = {https://huggingface.co/ukisai/Swift-Qwen3.8-27b}
}
- Task
- Image-Text-to-Text
- Library
- gguf
- License
- other
- Created
- Sep 11, 2026
- Updated
- Oct 1, 2026