FullStackBench
Models write code for 3,374 problems in 16 programming languages across domains like data analysis and web development. Unit tests score each answer.
- Made by
- ByteDance Seed
- Released
- November 2024
- Kind
- Function-level problems
- Level
- University
- Scored
- Checked automatically
- Answers
- Code
- Tasks
- All public
- Strongest model tested
-
Qwen3.5-35B-A3B #102 on the capability index
- Last in a launch post
- February 2026, dropped before it saturated
- Last model added
- February 2026
- Scores refreshed
- November 12th, 2026
In the authors’ words
As the capabilities of code large language models (LLMs) continue to expand, their applications across diverse code intelligence domains are rapidly increasing. However, most existing datasets only evaluate limited application domains. To address this gap, we have developed a comprehensive code evaluation dataset FullStack Bench focusing on full-stack programming, which encompasses a wide range of application domains (e.g., basic programming, data analysis, software engineering, mathematics, and machine learning). Besides, to assess multilingual programming capabilities, in FullStack Bench, we design real-world instructions and corresponding unit test cases from 16 widely-used programming languages to reflect real-world usage scenarios rather than simple translations. Moreover, we also release an effective code sandbox execution tool (i.e., SandboxFusion) supporting various programming languages and packages to evaluate the performance of our FullStack Bench efficiently. Comprehensive experimental results on our FullStack Bench demonstrate the necessity and effectiveness of our FullStack Bench and SandboxFusion.
MiniMax-M1-80k leads with 68.3% among models released by February 2026
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.
o1-preview leads with 65.6% 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.
MiniMax-M1-80k leads with 68.3%, 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 February 2026, and nobody has reported 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
MiniMax-M1-80k 68.3%
- 2
Hunyuan-A13B-Instruct 67.8%
- 3
ERNIE-4.5-300B-A47B 67.1%
- 4
Qwen3.5-122B-A10B 60.7%
- 5
Qwen3-Coder-Next 60.6%
- 6
Qwen3.5-27B 58.8%
- 7
Qwen3.5-35B-A3B 56.5%
- 8
Seed-Coder-8B-Instruct 55.8%
Source: Labs’ model cards
- 1 o1-preview 65.6%
- 2 o1-mini 64.7%
- 3 GPT-4o Aug 2024 61.8%
- 4
DeepSeek-Coder-V2 236B 58.1%
- 5
Qwen2.5-72B 56.9%
- 6
Qwen2.5-Coder-32B-Instruct 56.9%
- 7 Qwen2.5-Coder-14B-Instruct 55.3%
- 8 DeepSeek-Coder-V2-Lite-Instruct 48.7%
- 9 CodeQwen1.5-7B 40.5%
- 10
Code Llama 34B Instruct 29.2%
Source: Official FullStackBench leaderboard
- 68.3
MiniMax-M1-80k
- 67.8
Hunyuan-A13B-Instruct
- 67.1
ERNIE-4.5-300B-A47B
- 65.6 o1-preview
- 64.7 o1-mini
- 61.8 GPT-4o
- 60.7
Qwen3.5-122B-A10B
- 60.6
Qwen3-Coder-Next
- 58.8
Qwen3.5-27B
- 58.1
DeepSeek-Coder-V2 236B
- 56.9
Qwen2.5-72B
- 56.9
Qwen2.5-Coder-32B-Instruct
- 56.5
Qwen3.5-35B-A3B
- 55.8
Seed-Coder-8B-Instruct
- 55.3 Qwen2.5-Coder-14B-Instruct
- 48.7 DeepSeek-Coder-V2-Lite-Instruct
- 40.5 CodeQwen1.5-7B
- 29.2
Code Llama 34B Instruct
- 1
MiniMax-M1-80k 68.3%
- 2
Hunyuan-A13B-Instruct 67.8%
- 3
ERNIE-4.5-300B-A47B 67.1%
- 4 o1-preview 65.6%
- 5 o1-mini 64.7%
- 6 GPT-4o Aug 2024 61.8%
- 7
Qwen3.5-122B-A10B 60.7%
- 8
Qwen3-Coder-Next 60.6%
- 9
Qwen3.5-27B 58.8%
- 10
DeepSeek-Coder-V2 236B 58.1%
- 11
Qwen2.5-72B 56.9%
- 12
Qwen2.5-Coder-32B-Instruct 56.9%
- 13
Qwen3.5-35B-A3B 56.5%
- 14
Seed-Coder-8B-Instruct 55.8%
- 15 Qwen2.5-Coder-14B-Instruct 55.3%
- 16 DeepSeek-Coder-V2-Lite-Instruct 48.7%
- 17 CodeQwen1.5-7B 40.5%
- 18
Code Llama 34B Instruct 29.2%
Sources: Labs’ model cards and official FullStackBench leaderboard
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | | 68.3% | Jun 2025 | Lab model card | |
| 2 | | 67.8% | Jun 2025 | Lab model card | |
| 3 | | 67.1% | Jun 2025 | Lab model card | |
| 4 | | 60.7% | Feb 2026 | Lab model card | |
| 5 | | 60.6% | Feb 2026 | Lab model card | |
| 6 | | 58.8% | Feb 2026 | Lab model card | |
| 7 | | 56.5% | Feb 2026 | Lab model card | |
| 8 | | 55.8% | Jun 2025 | Lab model card |
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | o1-preview | 65.6% | Sep 2024 | Official leaderboard | |
| 2 | o1-mini | 64.7% | Sep 2024 | Official leaderboard | |
| 3 | GPT-4o Aug 2024 | 61.8% | Aug 2024 | Official leaderboard | |
| 4 | | 58.1% | Jun 2024 | Official leaderboard | |
| 5 | | 56.9% | Sep 2024 | Official leaderboard | |
| 6 | | 56.9% | Nov 2024 | Official leaderboard | |
| 7 | Qwen2.5-Coder-14B-Instruct | 55.3% | Nov 2024 | Official leaderboard | |
| 8 | DeepSeek-Coder-V2-Lite-Instruct | 48.7% | Jun 2024 | Official leaderboard | |
| 9 | CodeQwen1.5-7B | 40.5% | Apr 2024 | Official leaderboard | |
| 10 | | 29.2% | Aug 2023 | Official leaderboard |
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | | 68.3% | Jun 2025 | Lab model card | |
| 2 | | 67.8% | Jun 2025 | Lab model card | |
| 3 | | 67.1% | Jun 2025 | Lab model card | |
| 4 | o1-preview | 65.6% | Sep 2024 | Official leaderboard | |
| 5 | o1-mini | 64.7% | Sep 2024 | Official leaderboard | |
| 6 | GPT-4o Aug 2024 | 61.8% | Aug 2024 | Official leaderboard | |
| 7 | | 60.7% | Feb 2026 | Lab model card | |
| 8 | | 60.6% | Feb 2026 | Lab model card | |
| 9 | | 58.8% | Feb 2026 | Lab model card | |
| 10 | | 58.1% | Jun 2024 | Official leaderboard | |
| 11 | | 56.9% | Sep 2024 | Official leaderboard | |
| 12 | | 56.9% | Nov 2024 | Official leaderboard | |
| 13 | | 56.5% | Feb 2026 | Lab model card | |
| 14 | | 55.8% | Jun 2025 | Lab model card | |
| 15 | Qwen2.5-Coder-14B-Instruct | 55.3% | Nov 2024 | Official leaderboard | |
| 16 | DeepSeek-Coder-V2-Lite-Instruct | 48.7% | Jun 2024 | Official leaderboard | |
| 17 | CodeQwen1.5-7B | 40.5% | Apr 2024 | Official leaderboard | |
| 18 | | 29.2% | Aug 2023 | Official leaderboard |
The benchmark's own leaderboard has 28 entries, 10 of them models we track. Switch the scores above to rank them together.
2 models have held number one in labs’ own numbers since its release in November 2024 Number one over time 2 models have held number one with claims included since its release in November 2024
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 FullStackBench 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 FullStackBench leaderboard and labs’ model cards
Labs headline it less often now, last in February 2026
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 |
|---|---|---|---|
| Feb 24, 2026 | 56.5 | Mean of FullStackBench en 58.1 / FullStackBench zh 55.0 | |
| Feb 24, 2026 | 58.8 | Mean of FullStackBench en 60.1 / FullStackBench zh 57.4 | |
| Feb 24, 2026 | 60.7 | Mean of FullStackBench en 62.6 / FullStackBench zh 58.7 | |
| Jun 30, 2025 | 67.1 | FullStackBench | |
| Jun 27, 2025 | 67.8 | Fullstackbench | |
| Jun 16, 2025 | 68.3 | FullStackBench |
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 |
|---|---|---|---|---|
| Feb 28, 2026 | | 60.6 | FullStackBench-en, zh 57.38 (Table 7) | Capabilities |
| Jun 29, 2025 | | 67.1 | FullStackBench (Table 5) | Capabilities |
| Jun 26, 2025 | | 67.8 | FullstackBench, slow-thinking (Table 3). Fast-thinking 58.3 (Table 4) | Capabilities |
| Jun 16, 2025 | | 68.3 | FullStackBench, avg of 16 samples (Table 2) | Capabilities |
| Jun 4, 2025 | | 55.8 | FullStack Bench Overall pass@1 (Tables 10 and 11) | Capabilities |
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DeepSeek V4.1 Flash 3,471