Changelog

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This changelog provides granular, real-time updates as changes are released. For a monthly summary of platform changes, see the Synthflow product changelog on our feedback portal.

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April 9, 2026

GPT-5.4, GPT-5.4 Mini, and GPT-5.4 Nano are now available

Three new OpenAI models are now available in the General Configuration AI Model selector and through the external API:

  • GPT-5.4 — OpenAI’s latest flagship model.
  • GPT-5.4 Mini — compact variant balancing performance and cost.
  • GPT-5.4 Nano — lightweight variant optimized for speed and cost.

You can also set these models via the API when creating or updating an agent:

1"agent": {
2  "llm": "gpt-5.4"
3}
EndpointTitle
POST /assistantsCreate an agent
PUT /assistants/:model_idUpdate an agent