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Daniel Han a2d2b7866f
Studio: wire Anthropic web_fetch server-side tool (#5671)
* Studio: wire Anthropic web_fetch server-side tool

Studio's Anthropic passthrough only forwarded web_search and
code_execution when enabled_tools was set. Asking Claude through Studio
to fetch a URL produced no fetch (the tool was not in the outbound
tools array), so users had to fall back to web_search even when they
already had the exact URL they wanted.

This change opts in web_fetch_20250910 when enabled_tools contains
"web_fetch". The new tool entry is appended alongside any existing
web_search / code_execution entries:

  {"type": "web_fetch_20250910", "name": "web_fetch", "max_uses": 5}

No anthropic-beta header is required (web_fetch is GA); the existing
code-execution-2025-08-25 flag continues to merge cleanly when both
tools are enabled in the same turn.

SSE translation mirrors the web_search path. A `server_tool_use` block
with name="web_fetch" emits a `tool_start` _toolEvent carrying the
URL the model asked to fetch; the matching `web_fetch_tool_result`
block emits a `tool_end` _toolEvent whose result string follows the
Title / URL / Snippet shape parseSourcesFromResult on the frontend
already expects, so the source pill renders identically. Error blocks
(`web_fetch_tool_error`) are surfaced as "Error: <error_code>" matching
the code_execution error path.

The final "Anthropic stream complete" log line picks up web_fetch_
requested / web_fetch_invocations / web_fetch_urls so support reports
of "the model did not fetch anything" can be triaged from the log.

Verified end to end against claude-haiku-4-5 with
`enabled_tools=["web_fetch"]`: the model emitted tool_start with
url=https://example.com and tool_end with the page Title + URL +
Snippet, plus the assistant message correctly read back "Example
Domain" as the title.

Tests:
- 5 new unit tests in test_anthropic_web_fetch.py covering tool
  registration, the combined web_search + web_fetch + code_execution
  request body, the pill-off case, and SSE translation for both
  success and error paths.
- All 242 existing Anthropic + OpenAI provider tests still pass.

The enabled_tools field description in models/inference.py is updated
so OpenAPI consumers see the new option.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* web_fetch: title fallback to URL, log parse failures, drop dead checks

Three review nits on the previous commit:

1. `_format_web_fetch_result` left `title` empty when Anthropic omitted
   `document.title`. The frontend `parseSourcesFromResult` only emits
   a source pill when both `Title:` and `URL:` lines are present, so
   fetches against pages without an HTML title tag silently lost
   their citation in the UI. Fall back to `title = title or url`,
   matching the web_search formatter.

2. The broad `except Exception` around `json.loads(buffer)` for the
   web_fetch input swallowed the failure with no trace. Log at debug
   so a malformed partial_json buffer can be triaged from the server
   log without changing behavior.

3. `inner` was already sanitised to a dict at the matching
   content_block_start and `_format_web_fetch_result` always returns
   a non-empty string (defaulting to "(fetch complete)"), so the
   `isinstance(inner, dict) else {}` guard and the
   `result_text or "(fetch complete)"` fallback at the emit site
   were dead code. Removed.

Added a test exercising the titleless path so the fallback stays
covered.

* chat-adapter: emit source pills for web_fetch tool calls

`parseSourcesFromResult` was only wired up for tool calls where
`toolName === "web_search"`, so the Title / URL / Snippet block the
backend formatter emits for `web_fetch_tool_result` never reached the
source-pill renderer. Users saw the raw tool result in the tool card
but the dedicated source-pill row at the message tail stayed empty.

Both web_search and web_fetch ship the same text shape today, so the
fix is to broaden the gate.

* Address review: wire web_fetch from Search pill + fix pause_turn truncation

Two reviewer follow-ups on the Anthropic web_fetch PR:

1. The backend tool wiring landed but the frontend chat-adapter
   never put `web_fetch` in `enabled_tools`, so toggling the Search
   pill only ever attached `web_search` -- web_fetch was unreachable
   from the UI. Added providerSupportsBuiltinWebFetch() (Anthropic
   today) and paired the entry with the existing Search pill, since
   the canonical workflow is "search returns URLs, fetch reads
   them" and there is no separate UI toggle yet.

2. `pause_turn` from Anthropic's stop_reason vocabulary fell through
   the finish_reason map's "stop" default, which the OpenAI-format
   client renders as end-of-message and truncates the answer. Per
   the docs pause_turn means "Claude paused a long server-tool
   turn (web_search / web_fetch) and will resume". Mapped to None
   and skipped the chunk emission so the SSE stream still ends with
   [DONE] on message_stop but no terminal finish_reason lands on
   the client. While there: added explicit mappings for `tool_use`
   (-> tool_calls) and `refusal` (-> content_filter) which were
   also falling through to "stop".

Tests added: pause_turn emits no finish_reason, end_turn still
emits "stop", refusal maps to "content_filter".

Sourcing: https://platform.claude.com/docs/en/api/messages#response-stop-reason

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
2026-05-22 06:03:48 -07:00
.github studio: unblock /load event loop on detect_audio_type (#5642, #5635) (#5669) 2026-05-22 05:47:58 -07:00
images images: use narrower Discord button and drop duplicate (#5552) 2026-05-18 05:00:59 -07:00
scripts Move uninstall scripts into scripts/ and fix references (#5644) 2026-05-20 04:42:03 -07:00
studio Studio: wire Anthropic web_fetch server-side tool (#5671) 2026-05-22 06:03:48 -07:00
tests studio: unblock /load event loop on detect_audio_type (#5642, #5635) (#5669) 2026-05-22 05:47:58 -07:00
unsloth Respect GC for GRPO (#5269) 2026-05-22 05:37:25 -07:00
unsloth_cli studio: regenerate desktop launcher on unsloth studio update (macOS + Linux + Windows) (#5577) 2026-05-19 05:49:10 -07:00
.gitattributes EOL LF (unix line endings) normalization (#3478) 2025-10-17 16:22:42 -07:00
.gitignore ci: advisory lockfile supply-chain audit (no install-script changes) (#5604) 2026-05-19 05:56:56 -07:00
.pre-commit-ci.yaml pre-commit CI config (#3565) 2025-11-07 14:44:18 -08:00
.pre-commit-config.yaml [pre-commit.ci] pre-commit autoupdate (#5586) 2026-05-18 22:57:43 -07:00
build.sh Add Studio web update banner and release version display (#5308) 2026-05-11 18:24:01 +04:00
cli.py Rename cli/ to unsloth_cli/ to fix namespace collision with stringzilla (#4393) 2026-03-17 20:40:21 -07:00
CODE_OF_CONDUCT.md Update CODE_OF_CONDUCT.md 2025-10-25 19:31:05 -07:00
CONTRIBUTING.md Revert "Improve documentation on how to export model from Colab" 2026-03-13 22:38:41 -07:00
COPYING Rename cli/ to unsloth_cli/ to fix namespace collision with stringzilla (#4393) 2026-03-17 20:40:21 -07:00
install.ps1 install: bump unsloth floor to >=2026.5.5 (#5621) 2026-05-19 07:40:53 -07:00
install.sh install: bump unsloth floor to >=2026.5.5 (#5621) 2026-05-19 07:40:53 -07:00
LICENSE Rename cli/ to unsloth_cli/ to fix namespace collision with stringzilla (#4393) 2026-03-17 20:40:21 -07:00
pyproject.toml Versioning 2026-05-19 07:00:04 -07:00
README.md Adding Connect a Provider README changes 2026-05-21 05:08:59 -07:00
unsloth-cli.py Merge pull request #3612 from Vangmay/feature/raw-text-dataprep 2026-01-08 03:38:15 -08:00

Unsloth logo

Unsloth Studio lets you run and train models locally.

FeaturesQuickstartNotebooksDocumentation


unsloth studio ui homepage

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

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

🦥 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 Googles 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. BlogNotebooks
  • 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 BlogVision 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\
Type Links
  Discord Join Discord server
  r/unsloth Reddit Join Reddit community
📚 Documentation & Wiki Read Our Docs
  Twitter (aka X) 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!