Swift 1.5 Qwen3.8-Flash-Next
Swift 1.5 Qwen3.8-Flash-Next is UkisAI’s reasoning-efficient derivative of Qwen3.8-Flash-Next, released as a BF16 checkpoint with quantized variants. UkisAI reports 63.4% fewer median thinking tokens and 1.8× speedup at xhigh, with less than 1% accuracy loss compared with the base model.
What it does
Use it for reasoning, coding, and long-horizon agent tasks with reduced reasoning-token use, either from downloadable weights or through UkisAI’s API.
- Availability
- BF16 checkpoint and quantized variants available for download; OpenAI-compatible API at ukisai.com/api/flash-next/v1
- Pricing model
- Free for research purposes via API; enterprise licensing referenced
- Deployment
- Hosted API or downloadable checkpoint for local-compatible runtimes
- Privacy
- Not established
- Licence
- Enterprise licensing referenced; licence terms not specified
Capability
Modality
Access
Deployment
Pricing
Target user
Evidence
5 claims- The model uses 63.4% fewer median thinking tokens and is 1.8x faster than the base on xhigh, with accuracy loss under 1%. [1]
It uses **63.4% fewer thinking tokens**, with a **1.8x speed up** while keeping the **accuracy loss <1%** vs base on xhigh.
Hugging Face. Quoted text is outside CC BY 4.0 and keeps its original rights. - The release is post-trained for coding and long-horizon agent work, including personal agents, terminal use, and software engineering. [1]
work such as personal agents, terminal use and software engineering.
Hugging Face. Quoted text is outside CC BY 4.0 and keeps its original rights. - The BF16 checkpoint is about 360 GB and requires a multi-GPU node. [1]
The BF16 checkpoint is about 360 GB, so it needs a multi-GPU node.
Hugging Face. Quoted text is outside CC BY 4.0 and keeps its original rights. - Quantized versions are available in AWQ, AutoRound, NVFP4, GGUF, and GSQ-RCO GGUF formats. [1]
- The OpenAI-compatible API is free for research purposes and requires no API key. [1]
It is **free for research purposes** and needs no
Hugging Face. Quoted text is outside CC BY 4.0 and keeps its original rights.
Sources
1
1
Hugging FaceOwner-controlled
https://huggingface.co/ukisai/Swift-Qwen3.8-Flash-Next
Retrieved 2026-10-28 01:03 UTC
Verified
Versions
3| Version | Effective | Change | Changed fields | State |
|---|---|---|---|---|
| 3 | 2026-10-23 05:27 UTC | evidence update | score | Current |
| 2 | 2026-09-26 06:49 UTC | material change | modality, access, deployment, pricing, availability, pricing model, deployment | Current |
| 1 | 2026-09-25 07:48 UTC | publication | None | Current |
In briefs
1- New models and tools focus on typed decisions and long-context tasks Weekly brief 2026-W39
Original catalog content is licensed under CC BY 4.0, attributed to wowsuchai. Source quotations and linked content keep their original rights.