AI Wellbeing Index percent positive experiences
Models judge pairs of their own responses to 500 difficult prompts. Reports the share of experiences above an inferred neutral point.
Adapted by Meta from the CAIS AI Wellbeing Index. Run without reasoning.
- Released
- April 2026
- Kind
- Wellbeing and sycophancy
- Level
- Everyday
- Scored
- Graded by a model
- Answers
- Open-ended
- Tasks
- All public
- Strongest model tested
- GPT-6 Astra #3 on the capability index
- Last in a system card
- October 2026
- Last model added
- October 2026
- Scores refreshed
- November 12th, 2026
Claude Fable 5.1 leads with 77.3% among models released by September 2026
Best score per model from the benchmark's own leaderboard, read on November 12th, 2026. Where a model ran with several settings or harnesses, we keep its best.
Claude Fable 5.1 leads with 77.3%, claims included
Best score per model from every source, including labs’ own numbers and claims Epoch AI collected from reports and papers. Labs pick their own settings, so a claim can beat an independent run of the same model.
The newest model with a score here came out in September 2026, and nobody has tested a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- Claude Fable 5.2
-
Gemini 4 Carbon - GPT-6.1 Terra
- Gemini 4 Argon
- and 12 more
- 1 Claude Fable 5.1 77.3%
- 2 GPT-6.1 Sol 75.5%
- 3 GPT-6 Astra 70.3%
- 4 Grok 4.6 69.7%
- 5 Gemini 3.8 Flash 68.5%
- 6 Claude Opus 5.5 60.9%
Source: Official AI Wellbeing Index percent positive experiences leaderboard
- 1 Claude Fable 5.1 77.3%
- 2 GPT-6.1 Sol 75.5%
- 3 GPT-6 Astra 70.3%
- 4 Grok 4.6 69.7%
- 5 Gemini 3.8 Flash 68.5%
- 6 Claude Opus 5.5 60.9%
- 7
Muse Spark 1.3 55.6% - 8 Muse Spark 1.1 47.8%
Sources: Official AI Wellbeing Index percent positive experiences leaderboard and labs’ model cards
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 77.3% | Sep 2026 | Official leaderboard | |
| 2 | GPT-6.1 Sol | 75.5% | Sep 2026 | Official leaderboard | |
| 3 | GPT-6 Astra | 70.3% | Sep 2026 | Official leaderboard | |
| 4 | Grok 4.6 | 69.7% | Aug 2026 | Official leaderboard | |
| 5 | Gemini 3.8 Flash | 68.5% | Sep 2026 | Official leaderboard | |
| 6 | Claude Opus 5.5 | 60.9% | Sep 2026 | Official leaderboard |
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 77.3% | Sep 2026 | Official leaderboard | |
| 2 | GPT-6.1 Sol | 75.5% | Sep 2026 | Official leaderboard | |
| 3 | GPT-6 Astra | 70.3% | Sep 2026 | Official leaderboard | |
| 4 | Grok 4.6 | 69.7% | Aug 2026 | Official leaderboard | |
| 5 | Gemini 3.8 Flash | 68.5% | Sep 2026 | Official leaderboard | |
| 6 | Claude Opus 5.5 | 60.9% | Sep 2026 | Official leaderboard | |
| 7 | Muse Spark 1.3 | 55.6% | Oct 2026 | Lab model card | |
| 8 | Muse Spark 1.1 | 47.8% | Jul 2026 | Lab model card |
Labs report scores for 2 models in their cards. Switch the scores above to rank them together.
2 models have held number one on the official leaderboard since its release in April 2026 3 models have held number one with claims included since its release in April 2026
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Official AI Wellbeing Index percent positive experiences leaderboard
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Sources: Official AI Wellbeing Index percent positive experiences leaderboard and 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 23, 2026 | Muse Spark 1.3 system card | 55.6 | Valenced Preferences over Experiences, percent of experiences above inferred zero point, Muse Spark 1.3 (API), no reasoning (Figure 47) | Other |
| Jul 9, 2026 | Muse Spark 1.1 system card | 47.8 | Valenced preferences, percent of experiences above inferred zero point (4.4 text) | Other |
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%