of gpt-oss-120b's structured outputs fail on MARA.
Updated October 31, 2026 · How we measure
Structured-output index
The same model breaks your pipeline's structured outputs 15× more often on some inference providers than on others. Find the best one for your pipelines.
Give this to your agent ↓
| # | Model | Broken structured outputs | Rank | Best for this model | Structured outputs a day |
|---|---|---|---|---|---|
| 1 | DeepSeek V3.1 | 0.12% | 1 of 4 | — | 9.0k |
| 2 | gpt-oss-120b | 0.76% | 1 of 18 | — | 12k |
Get updates when a new model drops
And which provider to use.
For inference providers
Structured outputs don't have to break
The same provider can handle structured outputs well on one model and struggle on the next. Implementations diverge on strings, optionals, composition and conditionals (the April announcement): the schema one provider enforces, another ignores.
on DeepSeek V3.1, its best model.
models, where MARA is the most reliable provider.
dotjson plugs into your inference stack, so every model you serve gets perfect structured outputs from day 0.
Fix MARA's structured outputs↵