# clm_B121F315DA1D

subject: Fireworks AI (/record/fireworks-ai.md)  
predicate: feature_added  
value: Grammar mode  
valid_from: 2024-02-20  
valid_to: null  
published: 2024-02-20  
recorded: 2026-10-28  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-10-31  
checked: 2026-10-31 · its source page states the value and the date  

> Announcement FEB 20, 2024 Why do all LLMs need structured output modes? Fireworks introduces “JSON mode” and “grammar mode” for 100% adherence to provided output schemas

What https://fireworks.ai/blog/llm-structured-output-json-grammar-mode says, word for word.

## Sources

- https://fireworks.ai/blog/llm-structured-output-json-grammar-mode (primary, Fireworks AI, published 2024-02-20)

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