OpenAI 現在可以輸出定義的 JSON 了

OpenAI 在「Introducing Structured Outputs in the API」這邊提到目前的 JSON mode 不能保證 schema 的正確性：

While JSON mode improves model reliability for generating valid JSON outputs, it does not guarantee that the model’s response will conform to a particular schema.

而現在新的 model 可以了：

Today we’re introducing Structured Outputs in the API, a new feature designed to ensure model-generated outputs will exactly match JSON Schemas provided by developers.

新的 model 代碼是 gpt-4o-2024-08-06 這組，而且又降價了：

By switching to the new gpt-4o-2024-08-06, developers save 50% on inputs ($2.50/1M input tokens) and 33% on outputs ($10.00/1M output tokens) compared to gpt-4o-2024-05-13.

這個功能可以解掉不少 workaround...