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v0.2.81

probelabs/probev0.2.81Feb 18, 2026by akaashrp

AI Summary

A major overhaul of the engine and API architecture, introducing OpenAI compatibility, expanded model support, and WebGPU performance improvements.

Key Highlights

  • Engine and API overhaul with ChatModule refactoring
  • OpenAI API mirroring support (chat/completions, embeddings, function calling)
  • Expanded prebuilt model support (Llama, Mistral, Gemma, Qwen, Phi)
  • WebGPU performance and reliability improvements
  • XGrammar integration for constrained generation

New Features

  • Engine and API overhaul (ChatModule refactored)
  • OpenAI API mirroring (chat/completions, embeddings, function calling)
  • Unified conversation template schema with custom templates
  • Expanded prebuilt model support (Llama 2/3/3.1/3.2, Mistral variants, Gemma 2, Qwen2/2.5/3, Phi family)
  • WebGPU performance/reliability improvements
  • XGrammar integration for JSON-schema/grammar-constrained generation
  • Support for IndexedDB caching
  • TVM-FFI refactoring for compatibility
  • ServiceWorkerEngine and updated Chrome extension demos

Full Release Notes

* Engine and API overhaul: ChatModule refactored into Engine/MLCEngine, consolidated constructor/reload behavior, multi-model loading, better worker lifecycle, concurrency handling
* OpenAI API: mirror chat/completions APIs, stateful options, function calling and embeddings support
* Conversation templates: unified conversation template schema with custom templates
* Expanded prebuilt model support: added support for more models (Llama 2/3/3.1/3.2, Mistral variants, Gemma 2, Qwen2/2.5/3, Phi family, including vision)
* Runtime and caching: WebGPU performance/reliability improvements (more GPU-side kernels, better OOM/deviceLost handling), wasm/prebuilt versioning updates, support IndexedDB caching
* XGrammar integration: JSON-schema/grammar-constrained generation, XGrammar structural tag
* TVM-FFI integration: refactor for compatibility with more recent TVM commits and TVM FFI 
* Examples: ServiceWorkerEngine + updated Chrome extension demos, new RAG/doc-chat examples, tool calls via structural tag
* CI: GitHub actions for linting and pre-commit hooks 

**Full Changelog**: https://github.com/mlc-ai/web-llm/compare/v0.2.0...v0.2.81