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ART

AI Agents & Assistants

Agent Reinforcement Trainer: train multi-step agents for real-world tasks using GRPO. Give your agents on-the-job training. Reinforcement learning for Qwen3.5, GPT-OSS, Llama, and more!

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Python Latest v0.5.17 · 4mo ago Security brief →

Features

  • Train multi-step agents for real-world tasks using GRPO
  • Serverless RL service that automates training and inference infrastructure
  • Reduces cost by ~40% and speeds up training by ~28%
  • Provides instant deployment of checkpoints via W&B Inference

Security Response History

2 CVEs
CVE Severity Disclosed Patched (this tool) vs Ecosystem Median
CVE-2026-42271 KEV high
CVSS 8.8
 2026-06-08 Unpatched Unpatched
CVE-2026-42208 KEV critical
CVSS 9.8
 2026-05-08 Unpatched Unpatched

Recent releases

View all 58 releases →
v0.5.17 Breaking risk
⚠ Upgrade required
  • vLLM upgraded to 0.17.0
  • unsloth and unsloth zoo downgraded
  • pyarrow added to Tinker extra
Breaking changes
  • Removed beta KL divergence from training loss
Notable features
  • W&B run config API
  • Tenant-scoped Tinker model aliases
  • Improved metrics in ART
Full changelog

Release Highlights

What's Changed

  • feat: Add W&B run config API (#615)
  • feat: add tenant-scoped Tinker model aliases (#614)
  • feat: Update Tinker renderers (#613)
  • feat: Update Tinker renderers (#612)
  • fix: Add pyarrow to Tinker extra (#611)
  • build: Upgrade vLLM to 0.17.0 (#610)
  • feat: Improved metrics in ART (#609)
  • ci: Auto-build and upload uv cache on miss (#608)
  • Remove beta KL divergence from training loss (#607)
  • Fix ty type checker errors and warnings (#606)
  • Clean up unused adapters before saving checkpoint (#605)
  • build: Upgrade to unsloth 2026.3.3 (#604)
  • Release v0.5.16 (#603)
  • build: Downgrade unsloth and unsloth zoo (#602)

Full Changelog: https://github.com/OpenPipe/ART/compare/v0.5.16...v0.5.17

View release on GitHub
v0.5.16 Breaking risk
Notable features
  • Serverless SFT training now records provenance on completion
Full changelog

Release Highlights

What's Changed

  • build: Downgrade unsloth and unsloth zoo (#602)
  • Release v0.5.15 (#599)
  • ci: Use hatch build in release workflow (#598)
  • Release v0.5.14 (#597)
  • Temporarily downgrade transformers (#596)
  • ci: Add package install smoke test workflow (#595)
  • Release v0.5.13 (#593)
  • fix: Use uv build in release workflow (#592)
  • Record serverless SFT provenance on training completion (#590)

Full Changelog: https://github.com/OpenPipe/ART/compare/v0.5.15...v0.5.16

View release on GitHub
v0.5.15 Breaking risk
Notable features
  • Record serverless SFT provenance on training completion
Full changelog

Release Highlights

What's Changed

  • ci: Use hatch build in release workflow (#598)
  • Temporarily downgrade transformers (#596)
  • ci: Add package install smoke test workflow (#595)
  • fix: Use uv build in release workflow (#592)
  • Record serverless SFT provenance on training completion (#590)

Full Changelog: https://github.com/OpenPipe/ART/compare/v0.5.14...v0.5.15

View release on GitHub
v0.5.14 Breaking risk

Minor fixes and improvements.

Full changelog

Release Highlights

What's Changed

  • Temporarily downgrade transformers (#596)
  • ci: Add package install smoke test workflow (#595)
  • Release v0.5.13 (#593)
  • fix: Use uv build in release workflow (#592)

Full Changelog: https://github.com/OpenPipe/ART/compare/v0.5.13...v0.5.14

View release on GitHub
v0.5.13 Breaking risk
Notable features
  • Transformers v5.x update
  • MoE LoRA conversion
  • Flex Attention for Megatron
View release on GitHub

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