Langflow (gateway)

Route Langflow’s underlying LLM calls through the Respan gateway to use 250+ models from different providers. Only your Respan API key is needed — no separate provider keys required.

Setup

$
pip install respan-tracing respan-instrumentation-langchain langflow langchain langchain-openai python-dotenv

$
export OPENAI_API_KEY="YOUR_RESPAN_API_KEY"
$
export OPENAI_BASE_URL="https://api.respan.ai/api"

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from langflow.load import run_flow_from_json
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result = run_flow_from_json(
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    flow="path/to/your/flow.json",
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    input_value="What is the meaning of life?",
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)
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print(result)

Switch models

Change the model in your flow’s OpenAI component to use 250+ models from different providers through the same gateway, for example gpt-4.1-nano, claude-sonnet-4-5-20250929, or gemini-2.5-flash.

See the full model list.