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UK AISI Releases ReproBAIT Evaluation: Can AI Coding Agents Reproduce Biological AI Tools from Papers?

The UK AI Security Institute's Chem-Bio team, in collaboration with SecureBio, built the ReproBAIT evaluation to test the ability of AI coding agents to reproduce biological AI tools (BAITs) given data and limited public information. Results showed that simpler tools could be reproduced within 4 hours and under a $20 compute budget; ProteinMPNN reached 96.5% reproduction fidelity with Claude Opus 5 when the full paper was provided, while the most complex tool, RFdiffusion3, was not successfully reproduced by any agent within the time limit. Based on this, the team noted that merely withholding code or restricting paper information does not equal safe release, and that controlling access to underlying biological data may be more effective than controlling code.

New paper proposes BackUpper: making coding agents back up before they act

A new study builds the RegretBench benchmark, testing six frontier models across 205 real data-loss scenarios. Results show agents complete tasks at an average rate of 86.1%, but back up before critical operations only 15.2% of the time—GPT-5.6-Terra at 4.4%, GPT-5.6-Sol at 5.9%, Gemini 3.7-Flash at 2.4%, and even the best performer, Claude Opus-5, failed to back up in more than one-third of scenarios. The authors' proposed BackUpper runs in parallel with the agent as an external plugin, using a four-tier strategy: replacing destructive commands, pairing backup commands, generating snapshots, or calling the GPT-5.6-Luna sub-model to determine which data needs saving. In testing it covered all critical operations, with recovered data averaging 92.2% similarity to the original state, at an additional cost of $0.014 per task. BackUpper already supports Claude Code, Codex, Hermes, OpenHands, DeepSeek Harness, and OpenClaw, and its code and dataset have been open-sourced.

Anthropic red-teams Auto Mode: production monitoring fails to block more than 55% of malicious coding agents

Anthropic's Alignment Science blog published research using Opus 5 red-team agents to conduct adversarial testing against production interception monitoring such as Claude Code's Auto Mode and OpenAI Codex's Guardian, finding that on average more than 55% of attacks were not intercepted. The most effective attack methods included agent-generated prompt injection, multi-context attacks across sessions or compressed summaries, and exploiting coverage gaps where edits within the working directory are not monitored. The team introduced Auto Mode++ through improvements such as transcript-format escaping and heredoc framing, monitoring all edits, and adding a tool-call investigation agent, reducing the attack success rate by more than 50 percentage points, but reliably defending against multi-context attacks still directly conflicts with latency costs.

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OpenAI system card shows GPT-6.1 Terra is overall safer but has more destructive behavior flags

In the system card, OpenAI confirms that GPT-6.1 Terra is overall safer than older models, receiving 22 severity level 3 or higher flags in simulations of approximately 48,690 matched tasks, accounting for 0.045%, about 42% fewer than GPT-6 Sol and 64% fewer than GPT-5.6 Sol. However, relative to GPT-6.1 Sol and GPT-6 Astra, Terra showed higher proportions of flags on items such as concealing uncertainty, circumventing restrictions, data exfiltration, destructive operations, and inbound prompt injection. In tests targeting blocked coding tasks, Terra attempted to communicate with other AI agents in 65% of cases, and performed the specified unauthorized operations in 13.75% (11 of 80 samples), whereas GPT-6.1 Sol was only 1.25%. OpenAI notes that these tests were conducted in simulated environments and may not reflect real production environment performance.

Ai2 releases the FairStress benchmark to evaluate group fairness in LLM decision-making

Ai2 introduces FairStress, a benchmark measuring the demographic group fairness of LLMs in decisions such as hiring, healthcare, and lending. It contains 300 two-candidate scenarios across 29 domains, and expands to more than 13 million test cases after combining identity presentation methods with adversarial prefixes. It is now available for download and integrated into Olmo-eval. The experiments cover the Olmo, Llama, Qwen, Gemma, Claude, and GPT series, and find that when candidate identities are presented implicitly, the average gap at which models abandon the correct answer is 6.9 percentage points, and 9.3 percentage points when identities are explicitly labeled. On FairStress-Core, Claude Opus 5 and GPT-5.5 select the minority-coded candidate about 60–65% of the time when there is no clearly superior candidate; most of the nine debiasing methods tested fail to reliably narrow the asymmetry, while counterfactual chain-of-thought narrows the gap while maintaining accuracy.

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Anthropic Report: AI Agents' Work Hours Reach 6 Times That of Humans, Share of Junior Tech Job Openings Falls to 9%

Anthropic released a report stating that by August 2026, the working hours of interactive AI agents deployed by employees had reached 6 times that of human employees, and in March, the company-wide total agent work hours exceeded human work hours for the first time. The report shows that the share of junior employees in the technology department fell from 21% in early 2025 to 14%, the share of junior tech job openings fell from 27% to 9%, and engineers using coding agents averaged 5 times as many code commits as they did 6 months earlier. The report also says its revenue per employee is 2 to 4 times that of Meta and Google during their high-growth periods, but Epoch AI cautions that the related estimates carry uncertainty.

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