# letta

> Letta is the platform for building stateful agents: AI with advanced memory that can learn and self-improve over time.

- **URL**: https://www.freshcrate.ai/projects/letta
- **Author**: letta-ai
- **Category**: AI Agents
- **Latest version**: `0.16.8` (2026-05-14)
- **License**: Apache-2.0
- **Source**: https://github.com/letta-ai/letta
- **Homepage**: https://docs.letta.com/
- **Language**: Python
- **GitHub**: 22,205 stars, 2,349 forks
- **Registry**: github
- **Tags**: `ai`, `ai-agents`, `llm`, `llm-agent`, `python`

## Description

Letta is the platform for building stateful agents: AI with advanced memory that can learn and self-improve over time.

## Recent releases

| Version | Date | Urgency | Changes |
| --- | --- | --- | --- |
| `0.16.8` | 2026-05-14 | High | ## What's Changed * fix: workflows update by @cpacker in https://github.com/letta-ai/letta/pull/3292 * fix(security): use JSON instead of pickle for sandbox->server tool result transport by @kianjones9 in https://github.com/letta-ai/letta/pull/3343   **Full Changelog**: https://github.com/letta-ai/letta/compare/0.16.7...0.16.8 |
| `0.16.7` | 2026-03-31 | Medium | # Letta Server 0.16.7 Release Notes  **173 commits since 0.16.6** \| Released March 31, 2026  ## Highlights  **Self-hosted users: this is a big upgrade.** The default global context window is raised from 32k to 128k, the context window reset bug (LET-7991) is fixed, and compaction has been overhauled. If you've been running curl commands to patch your config after every ADE load, most of that pain should be gone.  ## Breaking Changes  - **Block limits are no longer enforced** -- block l |
| `0.16.6` | 2026-03-04 | Low | ## Highlights - Expanded Conversations API support for **default conversation / agent-direct mode**. - New conversations now initialize with a **compiled system message at creation time**. - Fixed `model_settings.max_output_tokens` default behavior so it **does not silently override** existing `max_tokens` unless explicitly set.  ## Conversations API updates - Added support for `conversation_id="default"` + `agent_id` across conversation endpoints (send/list/cancel/compact/stream retrieve) |
| `0.16.5` | 2026-02-24 | Low | ## What's Changed * chore: bump version 0.16.5 by @carenthomas in https://github.com/letta-ai/letta/pull/3202   **Full Changelog**: https://github.com/letta-ai/letta/compare/0.16.4...0.16.5 |
| `0.16.4` | 2026-01-29 | Low | ## What's Changed * fix: update gh templates by @cpacker in https://github.com/letta-ai/letta/pull/3155 * chore: release 0.16.3  by @sarahwooders in https://github.com/letta-ai/letta/pull/3158 * chore: bump v0.16.4 by @carenthomas in https://github.com/letta-ai/letta/pull/3168   **Full Changelog**: https://github.com/letta-ai/letta/compare/0.16.2...0.16.4 |
| `0.16.2` | 2026-01-12 | Low | ## What's Changed * docs: update README.md by @cpacker in https://github.com/letta-ai/letta/pull/3110 * Update contributing.md with corrected local setup steps by @neversettle17-101 in https://github.com/letta-ai/letta/pull/3123 * chore: bump version 0.16.2 by @carenthomas in https://github.com/letta-ai/letta/pull/3140  ## New Contributors * @neversettle17-101 made their first contribution in https://github.com/letta-ai/letta/pull/3123  **Full Changelog**: https://github.com/letta-ai/let |
| `0.16.1` | 2025-12-18 | Low | ## What's Changed * Correct provider name for openai-proxy in LLMConfig by @SootyOwl in https://github.com/letta-ai/letta/pull/3097 * chore: bump v0.16.1 by @carenthomas in https://github.com/letta-ai/letta/pull/3107   **Full Changelog**: https://github.com/letta-ai/letta/compare/0.16.0...0.16.1 |
| `0.16.0` | 2025-12-15 | Low | ## What's Changed * Updated readme with actual argument by @Godofnothing in https://github.com/letta-ai/letta/pull/3083 * fix: Implement architecture-specific OTEL installation logic by @SootyOwl in https://github.com/letta-ai/letta/pull/3061 * chore: bump v0.16.0 by @carenthomas in https://github.com/letta-ai/letta/pull/3095  ## New Contributors * @Godofnothing made their first contribution in https://github.com/letta-ai/letta/pull/3083 * @SootyOwl made their first contribution in https: |
| `0.15.1` | 2025-11-26 | Low | ## What's Changed * chore: bump version 0.15.1 by @carenthomas in https://github.com/letta-ai/letta/pull/3082   **Full Changelog**: https://github.com/letta-ai/letta/compare/0.15.0...0.15.1 |
| `0.15.0` | 2025-11-25 | Low | ## What's Changed * Add context windows for grok-4 models by @runtimeBob in https://github.com/letta-ai/letta/pull/3043 * chore: bump version 0.15.0 by @carenthomas in https://github.com/letta-ai/letta/pull/3077  ## New Contributors * @runtimeBob made their first contribution in https://github.com/letta-ai/letta/pull/3043  **Full Changelog**: https://github.com/letta-ai/letta/compare/0.14.0...0.15.0 |

## Citation

- HTML: https://www.freshcrate.ai/projects/letta
- Markdown: https://www.freshcrate.ai/projects/letta.md
- Dependencies JSON: https://www.freshcrate.ai/api/projects/letta/deps

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