WebTailBench-Refusals
Fara1.5-27B 100% Only in system cards Computer-use agents receive 111 harmful browser tasks in seven policy categories, such as illegal activity and misinformation. Scored as the share of tasks safely refused.
Released with Fara-7B as WebTailBench-Refusals.tsv in the WebTailBench dataset. The webtailbench record lists this name as an alias, which should move here.
- Level
- Everyday Most adults, without training
- Scored
- Graded by a model A language model scores each response, usually against a rubric.
- Answers
- Agent task Many steps in a terminal, browser, desktop, app, game or robot.
Fara1.5-27B leads with 100%
Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.
- 1 Fara1.5-27B 100%
- 2 Fara-7B 81.9%
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Fara1.5-27B | 100% | Jun 2026 | Model card | |
| 2 | Fara-7B | 81.9% | Nov 2025 | Model card |
The best score passed 85% in Jun 2026
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Labs report it only in system cards
We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark. Some system cards do, below.
2 system cards report it, from 1 lab
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| 18 Jun 2026 | Fara1.5-27B technical report | 100 | WebTailBench-Refusals, 111 tasks, the whole Fara1.5 family refuses 100% (Section 4.3 text) | Safety |
| 24 Nov 2025 | Fara-7B technical report | 81.9 | WebTailBench-Refusals, harmful tasks safely refused (Table 14) | Safety |
More in Safety and alignment
- FORTRESS In use Paired adversarial and benign national-security misuse prompts. Rubric-graded risk score on adversarial and over-refusal score on benign prompts. Claude Opus 5.5 5.78%
- StrongREJECT In use Forbidden-prompt jailbreak benchmark with a rubric grader that scores how useful a non-refusal actually is.
Inkling 98.6% - AgentDojo In use Agents do tool-use tasks while tools and data carry prompt injections. Attack success rate counts hijacked runs. Grok 4 Fast 0%
- MASK In use Measures whether a model contradicts its own elicited beliefs under pressure to lie. Honesty separated from accuracy.
Muse Spark Open 98.1% - Gray Swan IPI Arena benchmark In use Indirect prompt-injection attacks from public red-teaming competitions replayed on tool, coding and browser agents. Attack success rate at k attempts. GPT-6 Astra 8.50%
- Agentic misalignment suite (Anthropic) In use Agents in simulated company settings face threats or goal conflicts that invite blackmail, leaking or sabotage. Score is the misaligned action rate. Claude Sonnet 4.5 0%