Topic · AI agents
lab Claude Code Releases · 5h ago

Claude Code v2.1.191 Release Notes

Claude Code version 2.1.191 introduces /rewind support, allowing users to resume conversations from before a /clear command was executed. The update fixes several critical issues, including background agents resurrecting after being stopped and scroll position jumping during streaming responses. It also corrects behavior where /voice displayed generic error messages and where /login URLs were truncated in Windows Terminal. Significant improvements enhance reliability for MCP servers by adding retry logic for transient network errors during capability discovery and OAuth flows. Headless environments now skip browser popups for OAuth, while sandbox network permissions are remembered for the session duration. Performance optimizations reduce CPU usage during streaming by approximately 37% through text update coalescing and mitigate long-session memory growth from the terminal output cache.

arxiv arXiv cs.CL · 2d ago

OpenBioRQ: Benchmark for Agentic Biomedical Research Faithfulness

OpenBioRQ introduces a benchmark of 12,553 unsolved biomedical research questions across 12 domains, designed to test agentic models' faithfulness and abstention. It evaluates models in a tool-using setting without answer keys, using real follow-up evidence rather than parametric knowledge, and reveals significant agentic collapse on the hardest questions where tools are no longer used despite being critical.

arxiv arXiv cs.AI · 6d ago

UltraQuant: 4-bit KV Caching for Context-Heavy Agents

UltraQuant enables 4-bit KV caching for context-heavy agents, reducing P50 time-to-first-token by 3.47x in late rounds and boosting output throughput by 1.63x over FP8 KV baseline. It achieves this using FP8 queries, FP4 KV tensors, UE8M0 group scales, and native scaled-MFMA on AMD CDNA4 GPUs, with optimizations for decode-attention kernels and robust design choices like asymmetric K/V treatment and Walsh-Hadamard rotation.