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* Studio: add Anthropic fast_mode toggle + surface streaming refusals Fast mode (beta `fast-mode-2026-02-01`) lets Claude Opus 4.6 and 4.7 generate output tokens up to 2.5x faster at 6x standard Opus pricing. The toggle lives in Configuration → Provider when the selected Anthropic model is Opus 4.6 or 4.7 and is otherwise hidden. Backend gates the same prefixes a second time so a stale frontend cannot make Anthropic 400 the request, and the `fast-mode-2026-02-01` beta header is merged onto whatever other betas the request already needed (code-execution, compaction). Streaming refusals (`message_delta.delta.stop_reason="refusal"` on Claude 4 models) now surface a short user-facing notice in the assistant message before the translated OpenAI chunk emits the existing `finish_reason="content_filter"`. Previously the chat bubble truncated silently because the SSE stopped mid-stream with no visible explanation. Per the upstream docs the conversation must be reset before continuing, so the notice tells the user exactly that. Reference: - https://platform.claude.com/docs/en/build-with-claude/fast-mode - https://platform.claude.com/docs/en/test-and-evaluate/strengthen-guardrails/handle-streaming-refusals Tests: - studio/backend/tests/test_anthropic_fast_mode_and_refusal.py (8 cases pinning fast_mode pass-through on 4.6/4.7, silent drop on Sonnet / Haiku / older Opus / None / False, and the refusal notice + finish reason on a synthetic refusal stream). * Studio: drop refused Anthropic turns from the next request Anthropic's streaming-refusal guidance says the refused assistant turn must be removed or updated before the next call -- otherwise the safety classifier keeps refusing. The PR only added a user-visible notice; the partial assistant output (plus the notice itself) still rode the next request via toOpenAIMessage. Tag the refusal turn with an HTML-comment sentinel emitted alongside the notice. The chat-adapter checks for that sentinel in toOpenAIMessage and returns null, so the refused turn is excluded from outboundMessages. The notice still renders in the transcript (HTML comments don't display), so users keep the explanation. * Studio: filter None finish_reason entries in test helper test_refusal_maps_to_content_filter expects only ['content_filter'] in the finish_reasons list, but the post-PR refusal path emits a user-visible content notice chunk first. Every _content_chunk carries 'finish_reason: None' by construction; the helper was appending those, so the assertion saw [None, 'content_filter'] instead of ['content_filter']. None is not a finish reason -- it's just mid-stream delta noise. Skip None values in _finish_reasons so the helper reflects what the test names actually claim to check. Same fix applies cleanly to the other helper usages (pause_turn test expects [] and the sibling stop test expects ['stop'], both unaffected). * Studio: cover Anthropic fast-mode edge cases Adds 19 cases on top of the 9 in test_anthropic_fast_mode_and_refusal. The base file pins the happy path; this file fills in the cliffs: * Dated-snapshot prefix matching: claude-opus-4-7-2026-02-01 and claude-opus-4-6-2026-02-01 still gate fast_mode through, while claude-opus-4-5-2025-08-01 and claude-sonnet-4-6-2026-02-01 do not. * Strict opt-in: a future claude-opus-4-8 or claude-opus-5 does NOT auto-enable fast_mode -- the prefix tuple must be bumped explicitly when a new family is whitelisted upstream. * Beta-header merge: fast_mode coexists with code-execution-2025-08-25 and compact-2026-01-12 in one comma-separated anthropic-beta header with no duplicates and no truncation. Pins the value to the exact fast-mode-2026-02-01 docs token so a typo would fail CI. * Non-destruction: fast_mode=None produces byte-identical outbound body and headers to the version that omits the argument entirely. Same for fast_mode=False. Guarantees the upgrade path is non-breaking on existing Anthropic streams. * Refusal stream ordering: the user-visible notice precedes the finish_reason chunk so a streaming UI paints text before flipping to content_filter. Refusal sentinel emitted exactly once. Notice rides a normal content delta chunk with finish_reason still null. Partial assistant deltas survive before the notice. * Provider-side refusal coverage: a refusal on Sonnet (not just Opus) still emits the notice + sentinel + content_filter mapping, since refusal handling is not gated on fast-mode capability. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Persist fastMode, drop refused user message on retry Two follow-ups on #5715: 1) sanitizeInferenceParams stripped fastMode. fastMode is in PERSISTED_INFERENCE_PARAM_KEYS but the storage sanitizer only kept numeric fields plus systemPrompt and trustRemoteCode, so the new toggle was silently dropped on reload and on the /api/chat/settings round-trip. Save it the same way trustRemoteCode is saved. 2) Refusal recovery now also drops the triggering user turn. Returning null from toOpenAIMessage on the assistant side left the user prompt that caused the refusal in the outbound history, so the very next request would re-trigger the same classifier. Anthropic's refusal-handling guidance is explicit on this: remove the refused turn AND the user message that triggered it before the next call. Implemented via a pre-pass that pops the trailing user message when an assistant carries the refusal sentinel. Typecheck clean. * Studio: out-of-band refusal signal + fast-mode prefix/usage/pricing fixes The text sentinel for the Anthropic refusal drop signal was spoofable: any assistant message containing the literal <!--studio:anthropic-refusal--> would prune the prior user + assistant pair on the next request. Move the signal onto a separate _toolEvent chunk that the chat adapter latches into assistant.metadata.custom.anthropicRefusal; assistant text can no longer control the pruner. Tighten the fast-mode model gate (backend + frontend) to require a "-" family boundary so claude-opus-4-70 / claude-opus-4-7b style IDs do not get speed: "fast" on a naive startswith match. Use survivingMessages for the image / audio attachment scan so a refused user turn does not gate or mis-attribute the next non-refused turn. Propagate Anthropic usage.speed onto the OpenAI-style usage chunk and apply the documented 6x fast-mode multiplier in the cost calculator (stacks with prompt-cache multipliers per the docs); expose the new multiplier on the pricing snapshot for the UI tooltip. Tests cover the tool-event chunk shape, the prefix-collision rejects, usage.speed propagation, the 6x pricing math, and that the visible refusal text carries no embedded sentinel. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Shorten fast-mode and refusal comments for PR #5715 --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> |
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Unsloth Studio lets you run and train models locally.
Features • Quickstart • Notebooks • Documentation
⚡ Get started
macOS, Linux, WSL:
curl -fsSL https://unsloth.ai/install.sh | sh
Windows:
irm https://unsloth.ai/install.ps1 | iex
Community:
⭐ Features
Unsloth Studio (Beta) lets you run and train text, audio, embedding, vision models on Windows, Linux and macOS.
Inference
- Search + download + run models including GGUF, LoRA adapters, safetensors
- Export models: Save or export models to GGUF, 16-bit safetensors and other formats.
- Tool calling: Support for self-healing tool calling and web search
- Code execution: lets LLMs test code in Claude artifacts and sandbox environments
- API inference endpoint: Deploy and run local LLMs in Claude Code, Codex tools with Unsloth
- Auto set inference settings and customize chat templates.
- We work directly with teams behind gpt-oss, Qwen3, Llama 4, Mistral, Gemma 1-3, and Phi-4, where we’ve fixed bugs that improve model accuracy.
- Chat with images, audio, PDFs, code, DOCX and more. Connect API providers (OpenAI, Anthropic) or servers (vLLM, Ollama).
Training
- Train and RL 500+ models up to 2x faster with up to 70% less VRAM, with no accuracy loss.
- Custom Triton and mathematical kernels. See some collabs we did with PyTorch and Hugging Face.
- Data Recipes: Auto-create datasets from PDF, CSV, DOCX etc. Edit data in a visual-node workflow.
- Reinforcement Learning (RL): The most efficient RL library, using 80% less VRAM for GRPO, FP8 etc.
- Supports full fine-tuning, RL, pretraining, 4-bit, 16-bit and, FP8 training.
- Observability: Monitor training live, track loss and GPU usage and customize graphs.
- Multi-GPU training is supported, with major improvements coming soon.
📥 Install
Unsloth can be used in two ways: through Unsloth Studio, the web UI, or through Unsloth Core, the code-based version. Each has different requirements.
Unsloth Studio (web UI)
Unsloth Studio (Beta) works on Windows, Linux, WSL and macOS.
- CPU: Supported for Chat and Data Recipes currently
- NVIDIA: Training works on RTX 30/40/50, Blackwell, DGX Spark, Station and more
- macOS: Training, MLX and GGUF inference are ALL supported.
- AMD: Chat + Data works. Train with Unsloth Core. Studio support is out soon.
- Multi-GPU: Available now, with a major upgrade on the way
macOS, Linux, WSL:
curl -fsSL https://unsloth.ai/install.sh | sh
Windows:
irm https://unsloth.ai/install.ps1 | iex
Launch
unsloth studio -p 8888
For cloud or global access, add -H 0.0.0.0. By default, Unsloth is accessible only locally.
Update
To update, use the same install commands above or use unsloth studio update.
Docker
Use our Docker image unsloth/unsloth container. Run:
docker run -d -e JUPYTER_PASSWORD="mypassword" \
-p 8888:8888 -p 8000:8000 -p 2222:22 \
-v $(pwd)/work:/workspace/work \
--gpus all \
unsloth/unsloth
Developer, Nightly, Uninstall
To see developer, nightly and uninstallation etc. instructions, see advanced installation.
Unsloth Core (code-based)
Linux, WSL:
curl -LsSf https://astral.sh/uv/install.sh | sh
uv venv unsloth_env --python 3.13
source unsloth_env/bin/activate
uv pip install unsloth --torch-backend=auto
Windows:
winget install -e --id Python.Python.3.13
winget install --id=astral-sh.uv -e
uv venv unsloth_env --python 3.13
.\unsloth_env\Scripts\activate
uv pip install unsloth --torch-backend=auto
For Windows, pip install unsloth works only if you have PyTorch installed. Read our Windows Guide.
You can use the same Docker image as Unsloth Studio.
AMD, Intel:
For RTX 50x, B200, 6000 GPUs: uv pip install unsloth --torch-backend=auto. Read our guides for: Blackwell and DGX Spark.
To install Unsloth on AMD and Intel GPUs, follow our AMD Guide and Intel Guide.
📒 Free Notebooks
Train for free with our notebooks. You can use our new free Unsloth Studio notebook to run and train models for free in a web UI. Read our guide. Add dataset, run, then deploy your trained model.
| Model | Free Notebooks | Performance | Memory use |
|---|---|---|---|
| Gemma 4 (E2B) | ▶️ Start for free | 1.5x faster | 50% less |
| Qwen3.5 (4B) | ▶️ Start for free | 1.5x faster | 60% less |
| gpt-oss (20B) | ▶️ Start for free | 2x faster | 70% less |
| Qwen3.5 GSPO | ▶️ Start for free | 2x faster | 70% less |
| gpt-oss (20B): GRPO | ▶️ Start for free | 2x faster | 80% less |
| Qwen3: Advanced GRPO | ▶️ Start for free | 2x faster | 70% less |
| embeddinggemma (300M) | ▶️ Start for free | 2x faster | 20% less |
| Mistral Ministral 3 (3B) | ▶️ Start for free | 1.5x faster | 60% less |
| Llama 3.1 (8B) Alpaca | ▶️ Start for free | 2x faster | 70% less |
| Llama 3.2 Conversational | ▶️ Start for free | 2x faster | 70% less |
| Orpheus-TTS (3B) | ▶️ Start for free | 1.5x faster | 50% less |
- See all our notebooks for: Kaggle, GRPO, TTS, embedding & Vision
- See all our models and all our notebooks
- See detailed documentation for Unsloth here
🦥 Unsloth News
- Connections: Connect any API provider (OpenAI, Anthropic) or server (vLLM, Ollama). Guide
- MTP: Run Qwen3.6 MTP in Unsloth. MTP settings are autoset specific to your hardware. Guide
- API inference endpoint: Deploy and run local LLMs in Claude Code, Codex tools. Guide
- Qwen3.6: Qwen3.6-35B-A3B can now be trained and run in Unsloth Studio. Blog
- Gemma 4: Run and train Google’s new models directly in Unsloth. Blog
- Introducing Unsloth Studio: our new web UI for running and training LLMs. Blog
- Qwen3.5 - 0.8B, 2B, 4B, 9B, 27B, 35-A3B, 112B-A10B are now supported. Guide + notebooks
- Train MoE LLMs 12x faster with 35% less VRAM - DeepSeek, GLM, Qwen and gpt-oss. Blog
- Embedding models: Unsloth now supports ~1.8-3.3x faster embedding fine-tuning. Blog • Notebooks
- New 7x longer context RL vs. all other setups, via our new batching algorithms. Blog
- New RoPE & MLP Triton Kernels & Padding Free + Packing: 3x faster training & 30% less VRAM. Blog
- 500K Context: Training a 20B model with >500K context is now possible on an 80GB GPU. Blog
- FP8 & Vision RL: You can now do FP8 & VLM GRPO on consumer GPUs. FP8 Blog • Vision RL
📥 Advanced Installation
The below advanced instructions are for Unsloth Studio. For Unsloth Core advanced installation, view our docs.
Developer installs: macOS, Linux, WSL:
git clone https://github.com/unslothai/unsloth
cd unsloth
./install.sh --local
unsloth studio -p 8888
Then to update :
unsloth studio update
Developer installs: Windows PowerShell:
git clone https://github.com/unslothai/unsloth.git
cd unsloth
Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
.\install.ps1 --local
unsloth studio -p 8888
Then to update :
unsloth studio update
Nightly: MacOS, Linux, WSL:
git clone https://github.com/unslothai/unsloth
cd unsloth
git checkout nightly
./install.sh --local
unsloth studio -p 8888
Then to launch every time:
unsloth studio -p 8888
Nightly: Windows:
Run in Windows Powershell:
git clone https://github.com/unslothai/unsloth.git
cd unsloth
git checkout nightly
Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
.\install.ps1 --local
unsloth studio -p 8888
Then to launch every time:
unsloth studio -p 8888
Uninstall
The recommended way to fully remove Unsloth Studio is the matching uninstall script for your OS. It stops any running servers, removes the install dir, the launcher data dir, the desktop shortcut, and any platform-specific entries (macOS .app bundle + Launch Services on Mac; Start Menu, HKCU\Software\Unsloth registry key and user PATH entries on Windows):
- MacOS, WSL, Linux:
curl -fsSL https://raw.githubusercontent.com/unslothai/unsloth/main/scripts/uninstall.sh | sh - Windows (PowerShell):
irm https://raw.githubusercontent.com/unslothai/unsloth/main/scripts/uninstall.ps1 | iex
If you only want to drop the install dir and keep the launcher/shortcut for a later reinstall, you can instead run rm -rf ~/.unsloth/studio (Mac/Linux/WSL) or Remove-Item -Recurse -Force "$HOME\.unsloth\studio" (Windows). The model cache at ~/.cache/huggingface is not touched by any of these.
For more info, see our docs.
Deleting model files
You can delete old model files either from the bin icon in model search or by removing the relevant cached model folder from the default Hugging Face cache directory. By default, HF uses:
- MacOS, Linux, WSL:
~/.cache/huggingface/hub/ - Windows:
%USERPROFILE%\.cache\huggingface\hub\
💚 Community and Links
| Type | Links |
|---|---|
| Join Discord server | |
| Join Reddit community | |
| 📚 Documentation & Wiki | Read Our Docs |
| Follow us on X | |
| 🔮 Our Models | Unsloth Catalog |
| ✍️ Blog | Read our Blogs |
Citation
You can cite the Unsloth repo as follows:
@software{unsloth,
author = {Daniel Han, Michael Han and Unsloth team},
title = {Unsloth},
url = {https://github.com/unslothai/unsloth},
year = {2023}
}
If you trained a model with 🦥Unsloth, you can use this cool sticker!
License
Unsloth uses a dual-licensing model of Apache 2.0 and AGPL-3.0. The core Unsloth package remains licensed under Apache 2.0, while certain optional components, such as the Unsloth Studio UI are licensed under the open-source license AGPL-3.0.
This structure helps support ongoing Unsloth development while keeping the project open source and enabling the broader ecosystem to continue growing.
Thank You to
- The llama.cpp library that lets users run and save models with Unsloth
- The Hugging Face team and their libraries: transformers and TRL
- The Pytorch and Torch AO team for their contributions
- NVIDIA for their NeMo DataDesigner library and their contributions
- And of course for every single person who has contributed or has used Unsloth!