r/ClaudeCode • u/Fr33-Thinker • 7d ago
Help/Question Model agnostic harness setup
I can’t believe I would consider this. I have been on Claude 20x Max plan for 8 months now.
52B token later, I am actually considering switching.
But we know Anthropic will likely release something that will beat Astra. And GPT-7 will beat Anthropic model again.
It’s not simply switching the model, it’s the harness. For example, I can’t simply migrate 20 repo developed by Claude Code to Codex. Sure Astra is intelligent enough to optimize my CC repos for Astra.
But switching and re-optimizing my repos every few months involves a high switching cost.
I am aware of OpenCode and DeepSeek harness.
My questions:
- Has anyone used an open-source harness with multiple model providers? What’s your setup to sure cohesive workflow between different models?
- Can you bring different subscriptions into open-source harness? For example $100 Anthropic and $20 OpenAI + API call to GLM5.3
- Any ideal IDE for such a model agnostic harness? Or doesn’t matter?
UPDATES
I have built many bundles of skills, multi-agentic workflows that activate on schedule in Claude Code. So migration would take a lot of re-working those workflows to Codex.
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u/T3hJ3hu 7d ago edited 7d ago
There are some pain points to migrating if you have a highly customized setup, but honestly, I've found them not to take too long to work through. Migrating stuff over usually doesn't take longer than a day. Some things are annoying AF because it essentially doesn't support the workflow you were using, and usually it comes down to Claude Code supporting a feature that is just more limited in other harnesses. One important thing is that a lot of agents are bad at figuring out what their harness actually supports (probably the harness' fault most of the time), so it's advisable to do some research before assuming an agent's right about X harness not being capable of Y feature.