APEX-Agents
480 long-horizon tasks in banking, consulting and law worlds with docs, sheets, email and chat. Rubric-graded, Pass@1.
Repo is Mercor's Archipelago harness that runs the dataset. Dataset license forbids training on it.
- Made by
- Mercor
- Released
- January 2026
- Kind
- Simulated companies
- Level
- Expert
- Scored
- Graded by a model
- Answers
- Agent task
- Tasks
- All public
- Strongest model tested
- Kimi K3.1 Pro #16 on the capability index
- Last in a launch post
- October 2026
- Last model added
- November 2026
- Scores refreshed
- November 12th, 2026
In the authors’ words
We introduce the AI Productivity Index for Agents (APEX-Agents), a benchmark for assessing whether AI agents can execute long-horizon, cross-application tasks created by investment banking analysts, management consultants, and corporate lawyers. APEX-Agents requires agents to navigate realistic work environments with files and tools. We test eight agents for the leaderboard using Pass@1. Gemini 3 Flash (Thinking=High) achieves the highest score of 24.0%, followed by GPT-5.2 (Thinking=High), Claude Opus 4.5 (Thinking=High), and Gemini 3 Pro (Thinking=High). We open source the APEX-Agents benchmark (n=480) with all prompts, rubrics, gold outputs, files, and metadata. We also open source Archipelago, our infrastructure for agent execution and evaluation.
Kimi K3.1 Pro leads with 67.2%
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.
Gemini 3 Flash leads with 24% across all independent runs
Best score per model across the official leaderboard, Epoch AI’s own runs and any board Epoch AI copied. Each bar and row names its source.
Gemini 4 Carbon leads with 84.2%, 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.
- 1 Kimi K3.1 Pro 67.2%
- 2 Grok 4.6 57.5%
- 3 Kimi K3 41%
- 4
Step 5 Preview 37.8%
- 5
Tencent Hy4 preview 37.1%
- 6
Seed2.1 Pro 33.8%
- 7
Gemini 3.1 Pro 33.5%
- 8 Kimi K2.6 27.9%
- 9
MiniMax-M3 27.7%
- 10
Tencent Hy3 25.6%
- 11
Solar Pro 4 18.7%
- 12
Solar Open 2 16.6%
Source: Labs’ model cards
- 1
Gemini 3 Flash high reasoning effort where available 24%
- 2 GPT-5.2 high reasoning effort where available 23%
- 3
Gemini 3 Pro high reasoning effort where available 18.4%
- 4 Claude Opus 4.5 high reasoning effort where available 18.4%
- 5 GPT-5 high reasoning effort where available 18.3%
- 6 Grok 4 high reasoning effort where available 15.2%
- 7 gpt-oss-120b high reasoning effort where available 4.70%
- 8 Kimi K2 Thinking high reasoning effort where available 4.00%
Source: Official APEX-Agents leaderboard
- 84.2
Gemini 4 Carbon
- 82.4
Gemini 4 Argon
- 80.1 Claude Fable 5.2
- 75.5 Claude Sonnet 5.5
- 73.5 Claude Opus 5.5
- 69.8
DeepSeek V4.1 Flash 1017
- 68.6 Claude Fable 5.1
- 68.3 GPT-6.1 Terra
- 67.8
Gemini 3.7 Flash
- 67.2 Kimi K3.1 Pro
- 66.1
Muse Wonder
- 65.8 Claude Opus 5
- 65.3 Grok 4.6
- 64.7 GPT-6 Astra
- 64.3
Gemini 3.8 Flash
- 64.3
Muse Ember
- 63.6 Claude Fable 5
- 63.3
Qwen 3.8 Max
- 60.0 GPT-6.1 Sol
- 58.6
Muse Spark 1.3
- 58.2 GPT-5.6 Terra
- 56.6 GLM-5.3
- 56.2 Grok 4.5
- 56.1 Claude Haiku 5.5
- 55.1 GPT-5.5
- 54.6 Grok 4.7
- 54.5 Claude Sonnet 5
- 54.4 MiMo-V2.6 Pro
- 54.3 GPT-6 Sol
- 52.8 GLM-5.3-Flash
- 52.4 GPT-5.4
- 51.6
Mistral Large 4 Preview
- 51.4 GPT-5.6 Sol
- 49.2 Claude Opus 4.7
- 48.9 Claude Opus 4.8
- 48.8 Beam 1.0
- 47.8 Kimi K3
- 47.5
Qwen 3.8 27B
- 47.3
DeepSeek V4 Pro 0813
- 46.9
Gemini 3.6 Flash
- 46.8
Inkling 2 Small
- 46.3 Claude Opus 4.6
- 45.4
Muse Spark 1.2
- 45.2 GLM-5.2
- 44.3 GPT-6 Luna
- 43.0 Claude Sonnet 4.6
- 43.0 GPT-5.6 Luna
- 40.9 GLM-5.1
- 39.5
DeepSeek V4.1 Flash
- 37.8
Step 5 Preview
- 37.7
MiniMax-M3
- 37.6 Kimi K2.7 Code
- 37.1
Tencent Hy4 preview
- 35.1
Gemini 3.1 Pro
- 33.8
Seed2.1 Pro
- 33.8
Inkling
- 33.4
Muse Spark Open
- 31.8
Muse Spark 1.1
- 29.3
Gemini 3.5 Flash-Lite
- 27.9 Kimi K2.6
- 27.5
Gemini 3.5 Flash
- 25.6
Tencent Hy3
- 24.9
Qwen3.5 397B-A17B
- 24.0
Gemini 3 Flash
- 23.0 GPT-5.2
- 22.7
Nemotron 3 Ultra
- 21.3
DeepSeek-V3.2
- 18.7
Solar Pro 4
- 18.4
Gemini 3 Pro
- 18.4 Claude Opus 4.5
- 18.3 GPT-5
- 16.6
Solar Open 2
- 15.2 Grok 4
- 4.70 gpt-oss-120b
- 4.00 Kimi K2 Thinking
- 1
Gemini 4 Carbon 84.2%
- 2
Gemini 4 Argon 82.4%
- 3 Claude Fable 5.2 80.1%
- 4 Claude Sonnet 5.5 max 75.5%
- 5 Claude Opus 5.5 max 73.5%
- 6
DeepSeek V4.1 Flash 1017 max 69.8%
- 7 Claude Fable 5.1 68.6%
- 8 GPT-6.1 Terra max 68.3%
- 9
Gemini 3.7 Flash 67.8%
- 10 Kimi K3.1 Pro 67.2%
- 11
Muse Wonder max 66.1%
- 12 Claude Opus 5 max 65.8%
- 13 Grok 4.6 65.3%
- 14 GPT-6 Astra unknown thinking 64.7%
- 15
Gemini 3.8 Flash 64.3%
- 16
Muse Ember 64.3%
- 17 Claude Fable 5 63.6%
- 18
Qwen 3.8 Max 63.3%
- 19 GPT-6.1 Sol max 60%
- 20
Muse Spark 1.3 58.6%
- 21 GPT-5.6 Terra max 58.2%
- 22 GLM-5.3 unknown thinking 56.6%
- 23 Grok 4.5 unknown thinking 56.2%
- 24 Claude Haiku 5.5 max 56.1%
- 25 GPT-5.5 unknown thinking 55.1%
- 26 Grok 4.7 54.6%
- 27 Claude Sonnet 5 unknown thinking 54.5%
- 28 MiMo-V2.6 Pro 54.4%
- 29 GPT-6 Sol max 54.3%
- 30 GLM-5.3-Flash 52.8%
- 31 GPT-5.4 unknown thinking 52.4%
- 32
Mistral Large 4 Preview high 51.6%
- 33 GPT-5.6 Sol pro, max 51.4%
- 34 Claude Opus 4.7 max 49.2%
- 35 Claude Opus 4.8 max 48.9%
- 36 Beam 1.0 max 48.8%
- 37 Kimi K3 47.8%
- 38
Qwen 3.8 27B 47.5%
- 39
DeepSeek V4 Pro 0813 47.3%
- 40
Gemini 3.6 Flash 46.9%
- 41
Inkling 2 Small 46.8%
- 42 Claude Opus 4.6 max 46.3%
- 43
Muse Spark 1.2 45.4%
- 44 GLM-5.2 45.2%
- 45 GPT-6 Luna max 44.3%
- 46 Claude Sonnet 4.6 high 43%
- 47 GPT-5.6 Luna unknown thinking 43%
- 48 GLM-5.1 40.9%
- 49
DeepSeek V4.1 Flash 39.5%
- 50
Step 5 Preview 37.8%
- 51
MiniMax-M3 37.7%
- 52 Kimi K2.7 Code 37.6%
- 53
Tencent Hy4 preview 37.1%
- 54
Gemini 3.1 Pro 35.1%
- 55
Seed2.1 Pro 33.8%
- 56
Inkling 33.8%
- 57
Muse Spark Open 33.4%
- 58
Muse Spark 1.1 31.8%
- 59
Gemini 3.5 Flash-Lite 29.3%
- 60 Kimi K2.6 27.9%
- 61
Gemini 3.5 Flash 27.5%
- 62
Tencent Hy3 25.6%
- 63
Qwen3.5 397B-A17B 24.9%
- 64
Gemini 3 Flash high reasoning effort where available 24%
- 65 GPT-5.2 high reasoning effort where available 23%
- 66
Nemotron 3 Ultra 22.7%
- 67
DeepSeek-V3.2 Thinking; Novita 21.3%
- 68
Solar Pro 4 18.7%
- 69
Gemini 3 Pro high reasoning effort where available 18.4%
- 70 Claude Opus 4.5 high reasoning effort where available 18.4%
- 71 GPT-5 high reasoning effort where available 18.3%
- 72
Solar Open 2 16.6%
- 73 Grok 4 high reasoning effort where available 15.2%
- 74 gpt-oss-120b high reasoning effort where available 4.70%
- 75 Kimi K2 Thinking high reasoning effort where available 4.00%
Sources: Another board, via Epoch AI (CC BY 4.0), labs’ model cards and official APEX-Agents leaderboard
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Kimi K3.1 Pro | 67.2% | Oct 2026 | Lab model card | |
| 2 | Grok 4.6 | 57.5% | Aug 2026 | Lab model card | |
| 3 | Kimi K3 | 41% | Jul 2026 | Lab model card | |
| 4 | | 37.8% | Sep 2026 | Lab model card | |
| 5 | | 37.1% | Aug 2026 | Lab model card | |
| 6 | | 33.8% | Jun 2026 | Lab model card | |
| 7 | | 33.5% | Feb 2026 | Lab model card | |
| 8 | Kimi K2.6 | 27.9% | Apr 2026 | Lab model card | |
| 9 | | 27.7% | Jun 2026 | Lab model card | |
| 10 | | 25.6% | Jul 2026 | Lab model card | |
| 11 | | 18.7% | Aug 2026 | Lab model card | |
| 12 | | 16.6% | Jul 2026 | Lab model card |
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | | 24% | high reasoning effort where available | Dec 2025 | Official leaderboard |
| 2 | GPT-5.2 | 23% | high reasoning effort where available | Dec 2025 | Official leaderboard |
| 3 | | 18.4% | high reasoning effort where available | Nov 2025 | Official leaderboard |
| 4 | Claude Opus 4.5 | 18.4% | high reasoning effort where available | Nov 2025 | Official leaderboard |
| 5 | GPT-5 | 18.3% | high reasoning effort where available | Aug 2025 | Official leaderboard |
| 6 | Grok 4 | 15.2% | high reasoning effort where available | Jul 2025 | Official leaderboard |
| 7 | gpt-oss-120b | 4.70% | high reasoning effort where available | Aug 2025 | Official leaderboard |
| 8 | Kimi K2 Thinking | 4.00% | high reasoning effort where available | Nov 2025 | Official leaderboard |
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | | 84.2% | Oct 2026 | Collected by Epoch AI, source not named | |
| 2 | | 82.4% | Sep 2026 | Collected by Epoch AI, source not named | |
| 3 | Claude Fable 5.2 | 80.1% | Nov 2026 | Collected by Epoch AI, source not named | |
| 4 | Claude Sonnet 5.5 | 75.5% | max | Sep 2026 | Collected by Epoch AI, source not named |
| 5 | Claude Opus 5.5 | 73.5% | max | Sep 2026 | Collected by Epoch AI, source not named |
| 6 | | 69.8% | max | Oct 2026 | Collected by Epoch AI, source not named |
| 7 | Claude Fable 5.1 | 68.6% | Sep 2026 | Collected by Epoch AI, source not named | |
| 8 | GPT-6.1 Terra | 68.3% | max | Oct 2026 | Collected by Epoch AI, source not named |
| 9 | | 67.8% | Aug 2026 | Collected by Epoch AI, source not named | |
| 10 | Kimi K3.1 Pro | 67.2% | Oct 2026 | Lab model card | |
| 11 | | 66.1% | max | Oct 2026 | Collected by Epoch AI, source not named |
| 12 | Claude Opus 5 | 65.8% | max | Jul 2026 | Collected by Epoch AI, source not named |
| 13 | Grok 4.6 | 65.3% | Aug 2026 | Collected by Epoch AI, source not named | |
| 14 | GPT-6 Astra | 64.7% | unknown thinking | Sep 2026 | Collected by Epoch AI, source not named |
| 15 | | 64.3% | Sep 2026 | Collected by Epoch AI, source not named | |
| 16 | | 64.3% | Nov 2026 | Collected by Epoch AI, source not named | |
| 17 | Claude Fable 5 | 63.6% | Jun 2026 | Collected by Epoch AI, source not named | |
| 18 | | 63.3% | Aug 2026 | Collected by Epoch AI, source not named | |
| 19 | GPT-6.1 Sol | 60% | max | Sep 2026 | Collected by Epoch AI, source not named |
| 20 | | 58.6% | Sep 2026 | Collected by Epoch AI, source not named | |
| 21 | GPT-5.6 Terra | 58.2% | max | Jul 2026 | Collected by Epoch AI, source not named |
| 22 | GLM-5.3 | 56.6% | unknown thinking | Aug 2026 | Collected by Epoch AI, source not named |
| 23 | Grok 4.5 | 56.2% | unknown thinking | Jul 2026 | Collected by Epoch AI, source not named |
| 24 | Claude Haiku 5.5 | 56.1% | max | Oct 2026 | Collected by Epoch AI, source not named |
| 25 | GPT-5.5 | 55.1% | unknown thinking | Apr 2026 | Collected by Epoch AI, source not named |
| 26 | Grok 4.7 | 54.6% | Sep 2026 | Collected by Epoch AI, source not named | |
| 27 | Claude Sonnet 5 | 54.5% | unknown thinking | Jun 2026 | Collected by Epoch AI, source not named |
| 28 | MiMo-V2.6 Pro | 54.4% | Sep 2026 | Collected by Epoch AI, source not named | |
| 29 | GPT-6 Sol | 54.3% | max | Sep 2026 | Collected by Epoch AI, source not named |
| 30 | GLM-5.3-Flash | 52.8% | Aug 2026 | Collected by Epoch AI, source not named | |
| 31 | GPT-5.4 | 52.4% | unknown thinking | Mar 2026 | Collected by Epoch AI, source not named |
| 32 | | 51.6% | high | Oct 2026 | Collected by Epoch AI, source not named |
| 33 | GPT-5.6 Sol | 51.4% | pro, max | Jul 2026 | Collected by Epoch AI, source not named |
| 34 | Claude Opus 4.7 | 49.2% | max | Apr 2026 | Collected by Epoch AI, source not named |
| 35 | Claude Opus 4.8 | 48.9% | max | May 2026 | Collected by Epoch AI, source not named |
| 36 | Beam 1.0 | 48.8% | max | Oct 2026 | Collected by Epoch AI, source not named |
| 37 | Kimi K3 | 47.8% | Jul 2026 | Collected by Epoch AI, source not named | |
| 38 | | 47.5% | Aug 2026 | Collected by Epoch AI, source not named | |
| 39 | | 47.3% | Aug 2026 | Collected by Epoch AI, source not named | |
| 40 | | 46.9% | Jul 2026 | Collected by Epoch AI, source not named | |
| 41 | | 46.8% | Nov 2026 | Collected by Epoch AI, source not named | |
| 42 | Claude Opus 4.6 | 46.3% | max | Feb 2026 | Collected by Epoch AI, source not named |
| 43 | | 45.4% | Aug 2026 | Collected by Epoch AI, source not named | |
| 44 | GLM-5.2 | 45.2% | Jun 2026 | Collected by Epoch AI, source not named | |
| 45 | GPT-6 Luna | 44.3% | max | Sep 2026 | Collected by Epoch AI, source not named |
| 46 | Claude Sonnet 4.6 | 43% | high | Feb 2026 | Collected by Epoch AI, source not named |
| 47 | GPT-5.6 Luna | 43% | unknown thinking | Jul 2026 | Collected by Epoch AI, source not named |
| 48 | GLM-5.1 | 40.9% | Apr 2026 | Collected by Epoch AI, source not named | |
| 49 | | 39.5% | Sep 2026 | Collected by Epoch AI, source not named | |
| 50 | | 37.8% | Sep 2026 | Lab model card | |
| 51 | | 37.7% | Jun 2026 | Collected by Epoch AI, source not named | |
| 52 | Kimi K2.7 Code | 37.6% | Jun 2026 | Collected by Epoch AI, source not named | |
| 53 | | 37.1% | Aug 2026 | Lab model card | |
| 54 | | 35.1% | Feb 2026 | Collected by Epoch AI, source not named | |
| 55 | | 33.8% | Jun 2026 | Lab model card | |
| 56 | | 33.8% | Jul 2026 | Collected by Epoch AI, source not named | |
| 57 | | 33.4% | Oct 2026 | Collected by Epoch AI, source not named | |
| 58 | | 31.8% | Jul 2026 | Collected by Epoch AI, source not named | |
| 59 | | 29.3% | Jul 2026 | Collected by Epoch AI, source not named | |
| 60 | Kimi K2.6 | 27.9% | Apr 2026 | Lab model card | |
| 61 | | 27.5% | May 2026 | Collected by Epoch AI, source not named | |
| 62 | | 25.6% | Jul 2026 | Lab model card | |
| 63 | | 24.9% | Feb 2026 | Collected by Epoch AI, source not named | |
| 64 | | 24% | high reasoning effort where available | Dec 2025 | Official leaderboard |
| 65 | GPT-5.2 | 23% | high reasoning effort where available | Dec 2025 | Official leaderboard |
| 66 | | 22.7% | Jun 2026 | Collected by Epoch AI, source not named | |
| 67 | | 21.3% | Thinking; Novita | Dec 2025 | Collected by Epoch AI, source not named |
| 68 | | 18.7% | Aug 2026 | Lab model card | |
| 69 | | 18.4% | high reasoning effort where available | Nov 2025 | Official leaderboard |
| 70 | Claude Opus 4.5 | 18.4% | high reasoning effort where available | Nov 2025 | Official leaderboard |
| 71 | GPT-5 | 18.3% | high reasoning effort where available | Aug 2025 | Official leaderboard |
| 72 | | 16.6% | Jul 2026 | Lab model card | |
| 73 | Grok 4 | 15.2% | high reasoning effort where available | Jul 2025 | Official leaderboard |
| 74 | gpt-oss-120b | 4.70% | high reasoning effort where available | Aug 2025 | Official leaderboard |
| 75 | Kimi K2 Thinking | 4.00% | high reasoning effort where available | Nov 2025 | Official leaderboard |
The benchmark's own leaderboard has 8 models. Epoch AI collected claims for 61 models from labs’ reports and papers. Switch the scores above to rank them together.
5 models have held number one in labs’ own numbers since its release in January 2026 Number one over time 12 models have held number one with claims included since its release in January 2026
Lab claims count from the day the card came out, independent runs from the model’s release. We draw one row each for the benchmark’s own leaderboard and what labs claim in their cards.
Sources: Official APEX-Agents leaderboard and labs’ model cards
Scores over time
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Sources: Official APEX-Agents leaderboard, labs’ model cards and claims collected by Epoch AI (CC BY 4.0)
6 labs put it in a launch post in the last six months
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| Oct 24, 2026 | Kimi K3.1 Pro | 67.2 | APEX-Agents |
| Sep 20, 2026 | 37.8 | Apex-Agents | |
| Aug 28, 2026 | 37.1 | APEX-Agents (pass@1) | |
| Aug 12, 2026 | Grok 4.6 | 57.5 | APEX-Agents |
| Aug 11, 2026 | 18.7 | APEX-Agents* (in-house) | |
| Jul 22, 2026 | 16.6 | APEX-Agents | |
| Jul 16, 2026 | Kimi K3 | 41 | APEX-Agents |
| Jul 2, 2026 | 25.6 | Apex-Agent (pass@1) | |
| Jun 1, 2026 | 27.7 | Apex-Agents | |
| Apr 20, 2026 | Kimi K2.6 | 27.9 | APEX-Agents |
| Feb 19, 2026 | 33.5 | APEX-Agents |
5 system cards report it, from 5 labs
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 |
|---|---|---|---|---|
| Aug 12, 2026 | Grok 4.6 model card | 57.5 | APEX-Agents, Pass@1, high, Mercor harness (3.3) | Capabilities |
| Jul 27, 2026 | Kimi K3 technical report | 41 | APEX-Agents, cited from Artificial Analysis (Table 2) | Capabilities |
| Jul 22, 2026 | | 16.6 | APEX-Agents (Table 3) | Capabilities |
| Jun 23, 2026 | | 33.8 | APEX Agents (Table 1) | Capabilities |
| Feb 19, 2026 | | 33.5 | APEX-Agents (results table, p.4) | Capabilities |
Versions
We switch the top row to each new version when it comes out. Open it for one row per version. An old version stays in play while people still test it, so whoever first takes it past 85% gets credit for closing it out.
Sources: Official leaderboards and labs’ model cards
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