google-deepmind/onetwo v0.5.0

v0.5.0

Repository: google-deepmind/onetwo

Tag: v0.5.0

Published: 2026-06-02T14:11:21Z

Prerelease: no

Release notes:

• Backends
• ClaudeAPI: Added new backend for Anthropic Claude models, including

support for tool use and thinking control.

• OpenAI API: Migrated to the latest Responses API, adding support for

reasoning, tools, .embed, and .count_tokens.

• GoogleGenAIAPI:
• Updated default Gemini API model to gemini-3.1-flash-lite.
• Enabled server-side prefix caching.
• Added CachedChunkList for robust prefix cache handling.
• Removed token healing functionality.
• Added normalize kwarg to .embed.
• Improved token usage reporting in tracers.
• Added support for Gemini Function Calling (FC2.0) metadata.
• Bug fixes and model updates.
• SentencePieceTokenizer: Added a new tokenizer backend using the

standard sentencepiece library.

• Core
• Execution & Parallelism: Fixed event loop leak in

asyncio_run_wrapper.

• Tracing:
• Improved exception handling and reporting within the tracing system.
• Reduced tracing overhead by skipping large inputs/outputs in traces

for several backends and modules.

• Standard library
• Retrieval & QA:
• Architectural split for constrained retrieval, introducing

ConstrainedEmbeddingBasedIndex.

• Removed use of lambdas in EmbeddingBasedIndex for better pickle

support.

• Refined chunking logic in ChunkByMaxTokens.
• Added QAPromptBuilder for flexible QA prompt generation.
• code_execution: Fixed test for Python 3.14.
• Evaluation
• ot.evaluate: Optimized to write large results and results_debug

JSON files incrementally to avoid OOM errors.

• Colabs & Docs
• RAG Tutorial: Significantly revamped with improved explanations and

diagrams.

• Tutorial: Updated with ClaudeAPI examples.