Harbor-Index
Agents solve about 80 hard tasks drawn from 29 benchmarks run through Harbor adapters, such as HLE, GSO and SWE-bench Pro. Each task keeps its source verifier.
Version 1.0 (June 2026) had 82 tasks. Releases 1.1 to 1.4 in July 2026 fixed and re-pinned tasks to 80, each with its own frozen leaderboard. No pair passed 30% at launch.
- Made by
- Harbor and Laude Institute (Terminal-Bench team)
- Released
- June 2026
- Kind
- Terminal tasks
- Level
- Research frontier
- Scored
- Checked automatically
- Answers
- Agent task
- Tasks
- All public
- Strongest model tested
- GPT-5.5 #20 on the capability index
- Last in a launch post
- August 2026
- Last model added
- August 2026
- Scores refreshed
- November 12th, 2026
GPT-5.5 leads with 28.1% among models released by June 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. Every run is in the next chart.
Tencent Hy4 preview leads with 39.6%, 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 June 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 15 more
- 1 GPT-5.5 28.1%
- 2 Claude Opus 4.8 20.7%
- 3 Gemini 3.1 Pro 13.4%
- 4 GLM-5.2 9.80%
- 5 Kimi K2.6 8.50%
- 6
MiniMax-M3 6.10% - 7
DeepSeek-V4-Pro 4.90% - 8
Qwen3.7-Max 4.90% - 9 MiMo-V2.5-Pro 2.40%
Source: Official Harbor-Index leaderboard
- 1
Tencent Hy4 preview 39.6% - 2 GPT-5.5 28.1%
- 3 Claude Opus 4.8 20.7%
- 4 Gemini 3.1 Pro 13.4%
- 5 GLM-5.2 9.80%
- 6 Kimi K2.6 8.50%
- 7 MiniMax-M3 6.10%
- 8 DeepSeek-V4-Pro 4.90%
- 9 Qwen3.7-Max 4.90%
- 10 MiMo-V2.5-Pro 2.40%
Sources: Labs’ model cards and official Harbor-Index leaderboard
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | GPT-5.5 | 28.1% | Codex CLI | Apr 2026 | Official leaderboard |
| 2 | Claude Opus 4.8 | 20.7% | Claude Code | May 2026 | Official leaderboard |
| 3 | Gemini 3.1 Pro | 13.4% | Gemini CLI | Feb 2026 | Official leaderboard |
| 4 | GLM-5.2 | 9.80% | Terminus 2 | Jun 2026 | Official leaderboard |
| 5 | Kimi K2.6 | 8.50% | Terminus 2 | Apr 2026 | Official leaderboard |
| 6 | MiniMax-M3 | 6.10% | Terminus 2 | Jun 2026 | Official leaderboard |
| 7 | DeepSeek-V4-Pro | 4.90% | Claude Code | Apr 2026 | Official leaderboard |
| 8 | Qwen3.7-Max | 4.90% | Claude Code | May 2026 | Official leaderboard |
| 9 | MiMo-V2.5-Pro | 2.40% | Terminus 2 | Apr 2026 | Official leaderboard |
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Tencent Hy4 preview | 39.6% | Aug 2026 | Lab model card | |
| 2 | GPT-5.5 | 28.1% | Codex CLI | Apr 2026 | Official leaderboard |
| 3 | Claude Opus 4.8 | 20.7% | Claude Code | May 2026 | Official leaderboard |
| 4 | Gemini 3.1 Pro | 13.4% | Gemini CLI | Feb 2026 | Official leaderboard |
| 5 | GLM-5.2 | 9.80% | Terminus 2 | Jun 2026 | Official leaderboard |
| 6 | Kimi K2.6 | 8.50% | Terminus 2 | Apr 2026 | Official leaderboard |
| 7 | MiniMax-M3 | 6.10% | Terminus 2 | Jun 2026 | Official leaderboard |
| 8 | DeepSeek-V4-Pro | 4.90% | Claude Code | Apr 2026 | Official leaderboard |
| 9 | Qwen3.7-Max | 4.90% | Claude Code | May 2026 | Official leaderboard |
| 10 | MiMo-V2.5-Pro | 2.40% | Terminus 2 | Apr 2026 | Official leaderboard |
Labs report scores for 1 model in their cards. Switch the scores above to rank them together.
The best score, 28.1%, costs $2.17 a task
Runs on the cost frontier score higher than any run that's cheaper. The costs are the leaderboard's own estimates, so compare them only within this benchmark.
Source: Official Harbor-Index leaderboard
| Model | Effort | Harness | Score | Cost per task | Output tokens |
|---|---|---|---|---|---|
| GPT-5.5 | Codex CLI | 28.1% | $2.17 | ||
| Claude Opus 4.8 | Claude Code | 20.7% | $3.28 | ||
| GPT-5.5 | Terminus 2 | 19.7% | $1.89 | ||
| Claude Opus 4.8 | Terminus 2 | 15.8% | $3.57 | ||
| Gemini 3.1 Pro | Gemini CLI | 13.4% | $0.90 | ||
| Gemini 3.1 Pro | Terminus 2 | 10.7% | $1.08 | ||
| GLM-5.2 | Terminus 2 | 9.80% | $0.63 | ||
| Kimi K2.6 | Terminus 2 | 8.50% | $0.40 | ||
| GLM-5.2 | Claude Code | 8.50% | $2.50 | ||
| Kimi K2.6 | Claude Code | 6.10% | $2.33 | ||
| MiniMax-M3 | Terminus 2 | 6.10% | $0.22 | ||
| DeepSeek-V4-Pro | Claude Code | 4.90% | $2.16 | ||
| Qwen3.7-Max | Claude Code | 4.90% | $2.45 | ||
| Qwen3.7-Max | Terminus 2 | 4.90% | $0.44 | ||
| DeepSeek-V4-Pro | Terminus 2 | 3.70% | $0.43 | ||
| MiniMax-M3 | Claude Code | 3.70% | $0.80 | ||
| MiMo-V2.5-Pro | Terminus 2 | 2.40% | $0.05 | ||
| MiMo-V2.5-Pro | Claude Code | 2.40% | $0.60 |
Number one over time 2 models have held number one with claims included since its release in June 2026
Lab claims count from the day the card came out, independent runs from the model’s release.
Source: Official Harbor-Index 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 Harbor-Index leaderboard and labs’ model cards
One lab 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 |
|---|---|---|---|
| Aug 28, 2026 | Tencent Hy4 preview | 39.6 | Harbor-Index |
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