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Artificial Intelligence • USA
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Last Verified Event
Aug 28, 2026

OpenAI Chronological Timeline

2026
featureAug 28, 2026
95% Verified

OpenAI Releases Structured JSON Output Mode Globally Across All API Tiers

OpenAI announced native schema-constrained JSON output across gpt-4o and mini models, guaranteeing 100% adherence to defined JSON Schemas without format drift.

Before: JSON mode required system prompt instructions and heuristic retry loops for schema validation.
After: Native response_format: { type: "json_schema", json_schema: {...}, strict: true } guaranteed output.
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Complete OpenAI Change Log Index

DateChange TitleTypeImpactDetails
Aug 28, 2026OpenAI Releases Structured JSON Output Mode Globally Across All API Tiersfeature8/10View ➔
featureAug 28, 2026
OpenAI Releases Structured JSON Output Mode Globally Across All API Tiers
Impact: 8/10View Record