OpenCode vs Claude Code: The Same Feature, Both Ways (2026 Field Log)

Quick answer (2026): OpenCode and Claude Code both drive an AI coding agent from your terminal, but they answer different questions. OpenCode is open source and model-agnostic, so you bring your own model and own the harness. Claude Code is managed and tuned around Anthropic's models, so the harness improves without you touching it. I ran the same feature through both on the same repo. Reach for OpenCode when model choice and cost matter more than polish. Reach for Claude Code when you want the deepest agent behavior on a single vendor and you do not want to tune anything.

I kept hitting the same argument on Reddit and in every comparison post: OpenCode is "the open one," Claude Code is "the locked one," pick your side.

That framing is lazy. So I gave both a real task on the same repo and watched what actually happened.

Here is the field log.

The setup

One repo. A small B2B agent product I am building with a cofounder. One feature: add an invite flow so a team owner can invite a teammate by email, with a pending state and an accept step.

Not a toy. Real auth, real database, real edge cases.

I ran the feature twice from a clean branch. Once with OpenCode. Once with Claude Code. Same prompt, same context files, same me.

Round 1: getting in

OpenCode starts fast. npm i -g opencode-ai, point it at a provider, go. It reads your existing keys. I pointed it at Claude for the first run to keep the model constant, then swapped to a cheaper model later to feel the difference. OpenCode supports a long list of providers, so the model is a config line, not a lock-in.

Claude Code wants Anthropic auth and then it just runs. No provider decision, no routing. You are on Anthropic's models and that is the whole point.

First difference: OpenCode makes me choose. Claude Code makes the choice for me. Neither is wrong. It depends on how much of that decision you want to own.

Round 2: the same feature, both ways

Both agents got the invite flow working. Neither one-shot it. Both needed a second pass on the pending-state logic.

What differed was the texture.

Claude Code moved like it had opinions. It picked a migration pattern, wired the accept route, and wrote a test without being asked. When it was wrong, it was confidently wrong in a way that was easy to catch.

OpenCode felt more literal. It did what I said, closely, and asked less. Its language-server awareness caught a type mismatch I would have shipped. That LSP feedback loop is real and I liked it.

If I had to name it: Claude Code behaves like a senior who assumes. OpenCode behaves like a careful mid-level who checks. Some days I want each.

Round 3: the cost question everyone leads with

Every ranking post opens on price. OpenCode is cheaper, Claude Code is a premium bundle, done.

It is not that clean.

OpenCode's cost depends entirely on the model you hand it. Point it at a frontier model and you pay frontier prices, same as anywhere. Point it at a cheaper or local model and the bill drops, but so does the quality on the hard parts of the feature. On the invite flow, the cheap-model run needed three more corrections from me. That is not free. That is my time.

Claude Code's cost is bundled and predictable, and the harness is tuned to spend tokens where they help. You pay more per session but you steer less.

So the honest version is: OpenCode moves the cost around, it does not delete it. Sometimes it moves it onto you.

Round 4: the part nobody prices

Here is the reframe I actually care about.

The real axis is not open versus locked. It is who owns the harness.

The harness is everything around the model: the prompts, the tool wiring, the retry logic, the context management. With Claude Code, one vendor tunes that harness constantly and you inherit the upgrades for free. The best thread I read on this said it plainly: Claude has built the harness around Claude Code massively, and that compounding is hard to see in a one-day test (r/opencodeCLI discussion, 2026).

With OpenCode, the harness is yours and open. You can read it, change it, and point it at any model. But now you own the tuning. When a new model lands, matching Claude Code's behavior on it is your job, not a vendor's.

Model choice is a feature. Model choice is also a maintenance bill. Both are true.

The scoreboard

versus , after one real feature:

No overall winner, because there is not one. There is a fit.

What I kept

I kept both, and I route.

I open Claude Code when the task is gnarly and I want the agent to have strong opinions I can push back on. I open OpenCode when I want a specific model, a lower bill, or that LSP-checked, do-exactly-this behavior.

If you are picking one and you do not want to think about models or tuning, take Claude Code. If model freedom and an open, hackable harness are the point, take OpenCode and accept that the tuning is now your job.

The people who framed this as a loyalty test were the ones who never ran the same feature twice.

If you want the wider field, I compared seven Claude Code alternatives on one repo, and the Cursor vs Claude Code split is a different flavor of the same tradeoff.

P.S. I ran the invite flow a third time by hand, no agent, just to remember how slow I am now. Point taken.