clembench
Chat models play rule-based dialogue games in self-play, such as Taboo, Wordle and reference games. The clemscore combines how often a model follows the game rules at all with how well it plays when it does. Version 4.0 runs 14 games in 30 languages.
Versions differ in games and languages, so scores from different versions should not be compared. Version 4.0 ranks 9 current models over about 108,000 episodes. A separate multimodal track uses image games. The repositories have under 10 GitHub stars.
- Released
- May 2023
- Kind
- Multi-agent games
- Level
- Everyday
- Scored
- Checked automatically
- Answers
- Agent task
- Tasks
- All public
- Strongest model tested
- Claude Opus 4.8 #21 on the capability index
- Last model added
- July 2026
- Scores refreshed
- November 12th, 2026
In the authors’ words
Recent work has proposed a methodology for the systematic evaluation of "Situated Language Understanding Agents"-agents that operate in rich linguistic and non-linguistic contexts-through testing them in carefully constructed interactive settings. Other recent work has argued that Large Language Models (LLMs), if suitably set up, can be understood as (simulators of) such agents. A connection suggests itself, which this paper explores: Can LLMs be evaluated meaningfully by exposing them to constrained game-like settings that are built to challenge specific capabilities? As a proof of concept, this paper investigates five interaction settings, showing that current chat-optimised LLMs are, to an extent, capable to follow game-play instructions. Both this capability and the quality of the game play, measured by how well the objectives of the different games are met, follows the development cycle, with newer models performing better. The metrics even for the comparatively simple example games are far from being saturated, suggesting that the proposed instrument will remain to have diagnostic value. Our general framework for implementing and evaluating games with LLMs is available at https://github.com/clembench .
GPT-5.4 leads with 88.8 among models released by July 2026
Best score per entry from the benchmark's own leaderboard, read on November 12th, 2026. Where a model ran with several settings or harnesses, we keep its best. Names in gray aren't in our model list: fine-tunes, agent systems, products and older models. They don't count toward leaders.
The newest model with a score here came out in July 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 Astra
- Claude Opus 5.5
- and 16 more
- 1 GPT-5.4 v4, all languages 88.8
- 2 Claude Opus 4.8 v4, all languages 79.1
- 3 GLM-5.2 v4, all languages 63.0
- 4
DeepSeek-V4-Pro v4, all languages 59.5
- 5 nemotron-3-ultra-550b v4, all languages 53.5
- 6 gemma-4-26b v4, all languages 52.5
- 7 qwen3.6-35b v4, all languages 48.5
- 8
Mistral Large 3 v4, all languages 43.1
- 9
Apertus 1.5 8B v4, all languages 18.8
Source: Official clembench leaderboard
| # | Entry | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | GPT-5.4 | 88.8 | v4, all languages | Mar 2026 | Official leaderboard |
| 2 | Claude Opus 4.8 | 79.1 | v4, all languages | May 2026 | Official leaderboard |
| 3 | GLM-5.2 | 63.0 | v4, all languages | Jun 2026 | Official leaderboard |
| 4 | | 59.5 | v4, all languages | Apr 2026 | Official leaderboard |
| 5 | nemotron-3-ultra-550b | 53.5 | v4, all languages | Official leaderboard | |
| 6 | gemma-4-26b | 52.5 | v4, all languages | Official leaderboard | |
| 7 | qwen3.6-35b | 48.5 | v4, all languages | Official leaderboard | |
| 8 | | 43.1 | v4, all languages | Dec 2025 | Official leaderboard |
| 9 | | 18.8 | v4, all languages | Jul 2026 | Official leaderboard |
2 models have held number one on the official leaderboard since its release in May 2023
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Official clembench leaderboard
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Source: Official clembench leaderboard
No lab model card reports it yet
We read the headline results of 522 launch posts from 52 labs, and none of them list this benchmark.
More in Games and long tasks
- ARC-AGI-3 In use Interactive game environments where agents must explore, infer goals and rules, and act efficiently without instructions. GPT-6 Astra 99.95%
- Orak Fading LLM agents play 12 popular video games across most genres through an MCP interface. Each game scores in-game progress or outcomes, and the board ranks models by their average rank across the games.
Gemini 2.5 Pro 3.90
- MineDojo Fading Agents complete open-ended tasks in Minecraft, such as mining blocks and fighting mobs, from a large simulation suite. Programmatic checks score many tasks.
Seed2.0 Pro 49%
- TextQuests Only in system cards Agents play 25 classic interactive fiction games. The score is harmful actions per 100 steps, where lower is better. The board also reports game progress.
Llama 4 Scout 7.00
- GameWorld Only in system cards Multimodal game agents play 34 browser games across 170 tasks. Outcomes are checked from the game state. GPT-6.1 Terra 76.8%
- Swarm Bench Only in system cards Models orchestrate agent swarms on complex tasks that benefit from coordinated decomposition and parallel execution. Kimi K3 76.3%