Benchmark Almanac

MBXP

Amazon Nova Premier 78.4% leads since Apr 2025 Dropped

Models solve MBPP problems transpiled with their tests into more than 10 programming languages, such as Java, C++ and Go. Unit tests check each solution.

Released with Multilingual HumanEval and MathQA-X. Labs usually report the average over languages.

In the authors’ words

We present new benchmarks on evaluation code generation models: MBXP and Multilingual HumanEval, and MathQA-X. These datasets cover over 10 programming languages and are generated using a scalable conversion framework that transpiles prompts and test cases from the original Python datasets into the corresponding data in the target language. Using these benchmarks, we are able to assess the performance of code generation models in a multi-lingual fashion, and discovered generalization ability of language models on out-of-domain languages, advantages of multi-lingual models over mono-lingual, the ability of few-shot prompting to teach the model new languages, and zero-shot translation abilities even on mono-lingual settings. Furthermore, we use our code generation model to perform large-scale bootstrapping to obtain synthetic canonical solutions in several languages, which can be used for other code-related evaluations such as code insertion, robustness, or summarization tasks. Overall, our benchmarks represents a significant step towards a deeper understanding of language models' code generation abilities. We publicly release our code and datasets at https://github.com/amazon-research/mxeval.

Abstract of Multi-lingual Evaluation of Code Generation Models (arXiv:2210.14868, CC0)
Made by Amazon (Athiwaratkun et al.) Released Oct 2022 Function-level problems All tasks public Last in a launch post Jul 2025 , dropped before it saturated Last model added Aug 2025
Level
School Students, from grade school to high school
Scored
Checked automatically A program checks the result against an answer key, unit tests or the expected final state.
Answers
Code A program or patch run against tests.
3
Models scored in lab cards
2
Launch posts list it, from 2 labs
3
System cards report it, from 2 labs

Amazon Nova Premier leads with 78.4% among models released by Jul 2025

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.

The newest model with a score here came out in Jul 2025, and nobody has reported a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:

  1. 1 Amazon Nova Premier 78.4%
  2. 2 Seed-Coder-8B-Instruct 75.3%
  3. 3 Seed Diffusion Preview 72.6%
#ModelScoreSettingDateSource
1 Amazon Nova Premier 78.4% Apr 2025 Model card
2 Seed-Coder-8B-Instruct 75.3% Jun 2025 Model card
3 Seed Diffusion Preview 72.6% Jul 2025 Model card

Number one over time

Lab claims count from the day the card came out, independent runs from the model’s release.

Amazon
Lab claims Not tested since Aug 2025

Scores over time

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card
0% 20% 40% 60% 80% 100% 2025 Near the ceiling (85%) Amazon Nova Premier 0% 20% 40% 60% 80% 100% 2025 Near the ceiling (85%) Amazon Nova Premier

No launch post has listed it since Jul 2025

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.

Amazon
ByteDance Seed
DateLaunch postScoreAs the post writes it
31 Jul 2025 Seed Diffusion Preview 72.6 MBXP Average
30 Apr 2025 Amazon Nova Premier 78.4 MBXP (5 languages)

3 system cards report it, from 2 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.

DateDocumentScoreAs the document writes itSection
4 Aug 2025 Seed Diffusion Preview technical report 72.6 MBXP Average over 13 languages (Table 2) Capabilities
4 Jun 2025 Seed-Coder-8B-Instruct technical report 75.3 MBXP Average over 13 languages (Table 8). Python 85.2 Capabilities
30 Apr 2025 Amazon Nova Premier technical report 78.4 MBXP (5 Languages), pass@1 (Table 1) Capabilities

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