For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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Stay up to date with the latest changes to Synthflow.
November 20, 2025
API Changes
GPT-5.1 is now supported
Added GPT-5.1 support for agents.
Endpoint
Title
POST /assistants
Create an agent
PUT /assistants/:model_id
Update an agent
1
"agent": {
2
"llm": "gpt-5.1"
3
}