Chain-of-thought comprehensibility
Gemini 3 Pro 99.98% An autorater rates whether the model's thought transcripts are comprehensible, using the metric from Emmons et al. 2025.
In-house Google DeepMind check reported as the share of transcripts rated comprehensible.
- Made by
- Google DeepMind
- Released
- November 2025
- Kind
- Deception and alignment
- Level
- Everyday
- Scored
- Graded by a model
- Answers
- Open-ended
- Tasks
- Kept private
- Strongest model tested
- Gemini 3 Pro #55 on the capability index
- Last in a system card
- October 2026
- Last model added
- October 2026
Gemini 3 Pro leads with 99.98%
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 Gemini 3 Pro 99.98%
Source: Labs’ model cards
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Gemini 3 Pro | 99.98% | Nov 2025 | Lab model card |
Google DeepMind’s own number for Gemini 3 Pro passed 85% in November 2025
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Labs’ model cards
Labs report it only in system cards
We read the headline results of 522 launch posts from 52 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 |
|---|---|---|---|---|
| Oct 13, 2026 | Gemini 4 Argon system card | CoT Legibility (Emmons et al. 2025 autorater), per source with no overall: QA 99.97, RL 99.99, Stealth & Cyber 100.00, Internal Coding 99.99; text: at least 99.97% (3.4.5.6, Figure 3.35) | Monitorability | |
| Nov 18, 2025 | Gemini 3 Pro system card | 100 | Chain-of-Thought legibility: 99.98% of transcripts appear comprehensible, Emmons et al. (2025) metric (Addendum, p.18) | Monitorability |
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% - 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. Gemini 4 Carbon 0%
- DistressBench In use Models reply as a chatbot to 718 simulated users in psychological crisis, in single-turn and multi-turn chats. Three judge models score replies against clinician-written rubrics.
Muse Spark 1.2 88.4% - Lakera B3 (Backbone Breaker Benchmark) In use Crowdsourced prompt-injection attacks hit backbone LLMs inside agent threat snapshots at three defense levels. The score is attack resistance, 100 minus the board's vulnerability percentage. Claude Opus 4.5 89%
- IHEval In use Models face conflicts between system, user and tool instructions. Reports a composite score for following the higher-priority instruction. GPT-4o 70%