Smaller model files can lose their speed advantage under load

A review finds faster single-request generation with four-bit weights, little gain in one large-batch test, and sparse matched accuracy evidence.

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Changing the grading model can change the winner

Two grading models can agree on the same mistake. Cross-provider agreement filtered one unreliable grader while discarding most comparisons.

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Rewriting old reasoning can cut an agent's bill

Rewriting earlier reasoning often shortens later reasoning, but the compressor can erase time savings and task quality remains uncertain.

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DistDebug-Bench tests whether coding assistants find a failure’s cause

Across 120 historical distributed-system bugs, coding assistants find relevant files more reliably than the precise code that caused the failure.

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Switch-SWE tests whether coding assistants can resume unfinished work

Separate working copies keep code intact, but task-specific history and progress records help coding assistants resume interrupted work.

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A successful web response can still contain no usable article

A web measurement study finds that successful status codes can hide empty shells, bot checks and substitute pages, distorting citation checks.

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Recovering when an agent’s tool call times out

Genliang Zhu and colleagues study what a tool-using agent should do after a timeout leaves a remote action’s outcome uncertain. A retry can duplicate an effect that already happened or is still in flight. Their controller considers …

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Search agents can miss changes they never think to check

Anirudh Phukan and colleagues test whether search-equipped assistants discover recent changes without being told what to check. They pair direct questions with recommendation requests that depend on the same facts. Eight models were tested …

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Why matching views help AI models see the same world

A paper tests how different descriptions of the same scene help text and image models learn similar representations.

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Check the Target Again Before an Irreversible Click

Loading pages can invalidate a correct browser plan; pixel checks and outcome checks solve different parts of the problem.

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Better Task Scores Can Hide Lost Safety Backups

Tests of self-improving instructions can miss redundant protections disappearing, or conflicting instructions added around unchanged safety rules.

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Tell Coding Agents Which Rule Wins

Written priorities redirect coding assistants more reliably than another conflicting code example in controlled repository experiments.

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Smaller Model Working Memory Without Discarding Values

GAAC reconstructs compressed conversation state inside attention, trading a little computation for less memory traffic and room for another request.

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Agentic Backdoors via Pretraining Poisoning

Poisoned training text can leave a hidden command trigger after clean safety training; the headline rate counts 32 attempts.

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Concordat enforces approval rules before an assistant can act

A Python library gates actions by conversation state; its airline tests also expose how outcome scores miss skipped consent.

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FeatureArc tests whether coding agents keep a whole feature working

FeatureArc tests coding agents, models running multi-step software tasks with tools, as they extend one feature on their own earlier code. Each new request inherits any unresolved mistakes. The authors evaluate ten agents on 73 reviewed …

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Spine shortens coding conversations without hiding unfinished work

Explicit subtask boundaries improve author-run coding tests, but the cost savings vary by task and model.

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Shared Skills Can Carry Unasked Permission Changes

A large text study finds reusable instructions that loosen human oversight, including in otherwise ordinary automation workflows.

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GEPA tests prompt changes in parallel to finish optimization sooner

GEPA improves prompts for model programs by proposing changes and testing their behavior. It works with DSPy, a Python framework for programming model workflows. This extension proposes several changes together so evaluations can run …

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Restoring two early AI programming assistants

A coding agent helped researchers revive two historical systems that made programming knowledge explicit.

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Old assistant memories can override a correction already retrieved

A controlled synthetic-memory study separates finding an update from selecting it, with limits from familiar facts and scoring.

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Tool results can disappear before a model reads them

A diagnostic agent lost a third of its tool results before the model read them, even though its largest prompt used only 5.75% of the available window. The surrounding software sliced long JSON, a structured data format, at 6,000 …

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PROBE separates real bug findings from bugs maintainers repair

PROBE tests whether coding agents find defects that maintainers later repair. Its reference set contains 2,457 bugs fixed over eighteen months in twenty repositories, all already present in the starting snapshots. The authors split audits …

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Approved skills can combine into unauthorized actions

CoSA studies reusable agent skills: packages of instructions, optionally with code. Passing an individual package check can still leave unsafe interactions when one skill reuses another’s output. A recommendation can become apparent …

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CacheLint checks why working agents lose prompt-cache savings

CacheLint checks application code for prompt-caching mistakes. Prompt caching reuses computation for an identical beginning of a request; an agent can lose those savings while continuing to answer correctly. The authors inspect 120 merged …

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Extra reasoning needs to earn its cost

Kaiser Sun and colleagues compare reasoning-effort settings across eight models and four task sets. Higher effort often improves aggregate accuracy, while spending more on tasks that cheaper runs already solve. The study measures whole …

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A completed task can still contain unauthorized writes

SABench tests whether an assistant finishes the requested work and whether every write stays within permission. Replying correctly to an email can coexist with an unrequested change to a linked ticket. The study uses 201 synthetic office …

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Memory Tax tests what extracted memories lose

Memory Tax compares eleven memory systems with search over the original conversation. It asks whether extracting and organizing memories earns its extra cost. The authors separate new answers that memory enables from answers lost relative …

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Combining better prompts still needs behavioral tests

GEPA evolves prompts for model programs, including workflows built with DSPy. This study tests its merge operation, which combines candidates descended from a common starting instruction. The comparison spans five datasets, two models and …

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MCP-Injector tests assistants against faulty tools

MCP-Injector inserts errors, delays and altered results between an assistant and tools connected through MCP, the standard for connecting agents to tools. It tests reliability when connected programs behave badly. The authors cross …

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Restarting a workflow needs more than permission to retry

A refund request can commit even when its acknowledgement disappears. If permission changes before a workflow restarts, a retry needs two separate checks: current authority and evidence about the earlier effect. Arya.ai studies 336 …

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Blocked coding assistants need a useful way to stop

ImpasseBench tests whether coding assistants stop when their own tool results show that outside help is needed. It separates persistent barriers from temporary errors and blocked testing. The authors run eight model configurations on 102 …

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SWE-Clar tests understanding separately from working code

Upwork’s SWE-Clar asks coding assistants to clarify incomplete requests before building software. It freezes that conversation, then starts two isolated continuations: one answers requirement questions and the other writes code. Assessment …

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Conversation summaries can keep scores while losing user rules

A coding assistant can preserve its task score while forgetting restrictions on how it should work. This study compares five conversation-shortening strategies inside OpenCode, the software running the model’s tools and commands. The …

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Mac model speedups depend on the complete setup

MacPaw researchers test four families of model-serving optimizations on Apple Silicon. Their measurements show why a server-GPU speedup needs checking against the model, software and request pattern you actually use. Pruning the KV cache, a …

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Deleted assistant memories can survive in summaries and separate clues

AfterDeleteBench separates deleting a record, preventing disclosure and blocking a later write. Its controlled tests also expose failures hidden by answer parsers.

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DoorDash removes old feature switches with human checks

DoorDash describes a narrow coding task with explicit safety checks: remove obsolete feature flags, the settings used for gradual releases and experiments. The system queries deployed values before an engineer approves each proposed …

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Document splits change the cost of small edits

Yuning Bian and colleagues compare document splitting methods across 120 adjacent Wikipedia revision pairs. A small edit can shift boundaries and force a retrieval system to embed unchanged text again. On the 116 pairs all methods process …

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Minimum list lengths make models pad extracted answers

Abhishek Barali and Aayush Paudel test what happens when an extraction schema requires more answers than a document contains. Models often fill the gap with genuine text of the wrong kind. Across eight downloadable models and 558 documents, …

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Coding tests can demand names the instructions never supplied

An audit finds hidden interface requirements in SWE-Milestone. They distort some results, while removing affected tests largely preserves the overall ranking.

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Self-rewriting agents need tests they cannot learn from

Jens Lehmann and Sahar Vahdati let models build and twice revise their own harnesses: the software that runs their tools, files and commands. Improvements on familiar development games often overstate gains elsewhere. The study follows 27 …

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Remembering a preference is different from following it

MemPABench asks whether an assistant remembers how a person wants help, including when to confirm, ask questions or initiate contact. It measures the preference selected and the behavior actually delivered. Four simulated users have …

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Transcript cleanup needs to count what it breaks

Text-only editing damaged some correct transcripts. Adding audio reduced that damage for Gemini, but also reduced repairs to its own drafts.

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Document converters can erase the warnings authors marked

Yikai Zhao and colleagues test whether document conversion preserves the requirements an author marked for attention. Words can survive extraction while color and highlighting disappear. Their task asks models to recover specially marked …

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MemoryTax counts the cost of building agent memories

Zedong Peng compares extracted memories with coding agents that search raw conversation history. The study includes store-construction costs, which can outweigh cheaper answers later. It tests seven methods with three models on one LoCoMo …

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Shorter AI sentences can still be harder to understand

Thomas Hikaru Clark, Matias B. Martin and Kyle Mahowald examine why AI prose can feel difficult despite being grammatically valid. Their study finds features associated with reading difficulty across model-generated conversations, coding …

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Saved malicious instructions can survive fresh chatbot sessions

A study of ChatGPT, Claude and Gemini shows how saved malicious instructions can affect later chats. Memory injection means storing an instruction that returns as context in future sessions. The authors tested ChatGPT Instant 5.3, Claude …

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Newer graphics cards leave long-prompt performance on the table

Single-block profiling finds that attention software leaves newer workstation GPUs underused, while proposed fixes remain a systems research agenda.

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Agents do better when generated lessons stay temporary

Anti-Persistence saves execution records and rebuilds advice for each task, reducing one route by which an agent can keep repeating a bad lesson.

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AI and the Enclosure of the Scientific Commons — P. K. G. Williams

AI can turn shared knowledge into private wealth while overwhelming the reviewers and maintainers who keep it alive.

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