TL;DR: we just made GPT-5 available for free on Gensee, a developer-oriented AI Agent optimization and deployment platform: https://platform.gensee.ai/

This is a crazy week with a bunch of model releases: gpt-oss, Claude-Opus-4.1, and now today's GPT-5. It may feel impossible for agent developers to keep up, with all the manual migrating, re-testing, and analyzing.

We built Gensee to solve exactly this problem. Gensee lets you see the immediate impact of a new model on your already built agents and workflows. Here’s how it works:

- Instant Model Swapping: Have an agent running on GPT-4o? With one click, you can clone it and swap the underlying model to GPT-5 family. No code changes, no re-deploying.

- Automated A/B Testing & Analysis: Run your test cases against both versions of your agent simultaneously. Gensee gives you a side-by-side comparison of outputs, latency, and cost, so you can immediately see if GPT-5 improves quality or breaks your existing prompts and tool functions.

- Smart Routing for Optimization: Gensee automatically selects the best combination of models for any given task in your agent to optimize for quality, cost, or speed.

- Pre-built Agents: You can also grab one of our pre-built agents and immediately test it across the entire spectrum of new models to see how they compare.

The goal is to eliminate the engineering overhead of model evaluation so you can spend your time building, not just updating.

We'd love for you to try it out and give us feedback, especially if you have an existing project you want to benchmark against GPT-5.

Join our Discord: https://discord.gg/qQr6SVW4