PostTrain Bench
A software-engineering benchmark for post-training infrastructure and implementation tasks, evaluated through the official Harbor implementation.
Data verified 28 confirmed releases in the last 30 daysSee the free Radar BriefBenchmark score on PostTrain Bench — September 3, 2026
We mirror the published score view for PostTrain Bench. GLM-5.3 leads the public snapshot at 39.8%, followed by Kimi K3 (36.6%) and Hy4 preview (35.6%). We do not use these results to rank models overall.
GLM-5.3
Z.AI
Kimi K3
Moonshot AI
Hy4 preview
Tencent
3 modelsCodingCurrentDisplay onlyUpdated September 3, 2026
Benchmark score table (3 models)
ScoreThe published PostTrain Bench snapshot places GLM-5.3 first at 39.8%. The third row is 4.2 points behind. The broader top-10 range is 4.2 points, so many of the published results sit in a relatively narrow band.
3 models have been evaluated on PostTrain Bench. The benchmark falls in the Coding category. This category carries a 20% weight in BenchLM.ai's overall scoring system. PostTrain Bench is currently displayed for reference but excluded from the scoring formula, so it does not directly affect overall rankings.
About PostTrain Bench
Year
2026
Tasks
Post-training software-engineering tasks
Format
Harbor agent evaluation
Difficulty
Frontier software engineering
Moonshot evaluates Kimi K3 at maximum reasoning effort with the official Harbor implementation and Claude Code harness, averaged over three runs. BenchLM stores the provider-exact value as display-only launch evidence.
BenchLM freshness & provenance
Version
PostTrain Bench 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
FAQ
What does PostTrain Bench measure?
A software-engineering benchmark for post-training infrastructure and implementation tasks, evaluated through the official Harbor implementation.
Which model scores highest on PostTrain Bench?
GLM-5.3 by Z.AI currently leads with a score of 39.8% on PostTrain Bench.
How many models are evaluated on PostTrain Bench?
3 AI models have been evaluated on PostTrain Bench on BenchLM.
Compare Top Models on PostTrain Bench
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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