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# GEPA (Banking77)
cd synth-ai
uv run python /path/to/cookbooks/code/training/prompt_learning/gepa/run_walkthrough.py
Sources:

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Prerequisites

  • Python 3.11+
  • uv package manager
  • Accounts + API keys set up for Synth AI and your models
  • Environment variables:
    • SYNTH_API_KEY
    • ENVIRONMENT_API_KEY
    • GROQ_API_KEY (or other model provider key, depending on config)

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GEPA: Banking77 (In-Process)

Run a full GEPA optimization loop from a single script: 
cd synth-ai
uv run python /path/to/cookbooks/code/training/prompt_learning/gepa/run_walkthrough.py
Source:
run_walkthrough.py · config.toml · walkthrough.md

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What happens

  1. An in-process LocalAPI is started in a background thread.
  2. A Cloudflare tunnel is created automatically and registered with Synth AI.
  3. A GEPA prompt-learning job is submitted, monitored, and polled until completion.
  4. Final results are returned to Python, and the LocalAPI + tunnel are cleaned up automatically.

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Sample results

Job pl_5ea04259c2fd4c7a — 83.33% accuracy on Banking77 in ~35 seconds. 
{
  "job_id": "pl_5ea04259c2fd4c7a",
  "algorithm": "gepa",
  "dataset": "banking77",
  "best_score": 0.8333,
  "best_prompt_rank": 1,
  "num_generations": 8,
  "total_time_seconds": 35.6
}
See full run output in:
results.json

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Core pattern (GEPA)

The walkthrough uses the same in-process pattern: start a LocalAPI, create a tunnel, run a prompt-learning job pointed at the tunnel URL, and clean everything up when done. 
from synth_ai.sdk import InProcessTaskApp, PromptLearningJob


async def optimize_prompt(
    task_app_path: str,
    config_path: str,
    port: int = 8001,
):
    async with InProcessTaskApp(
        task_app_path=task_app_path,
        port=port,
    ) as task_app:
        # Build job from TOML config
        job = PromptLearningJob.from_config(
            config_path=config_path,
            task_app_url=task_app.url,
        )

        # Run until complete and fetch best prompt + metrics
        results = await job.poll_until_complete()

    return results
Minimal GEPA wrapper: 
# GEPA
results = await optimize_prompt(
    task_app_path="task_app.py",
    config_path="code/training/prompt_learning/gepa/config.toml",
)
Full GEPA walkthrough:
gepa/walkthrough.md

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