Updated · Sources & corrections
In this guide
OpenCode and Claude Code are coding-agent tools. Choosing between them involves model access, permissions, deployment policy and the quality of results on your own tasks. This guide compares those decisions without asserting an independently measured success-rate winner.
Separate the client from the model service
OpenCode documents multiple provider configurations. Claude Code documents its own supported access and deployment routes. Check the current provider list, authentication requirements and tool support for the exact configuration you plan to use. Changing providers also changes model behaviour, cost and data handling.
Configuration and permissions
Before a real code change, verify which directories and commands the tool can access. Start with a read-only repository question, inspect the proposed tool calls and add permissions only as required. Record the configuration used for any published comparison so another reader can reproduce it.
Compare on a clean repository
- Record CLI version, model identifier and provider.
- Use the same prompt and starting revision.
- Set the same task boundary and acceptance tests.
- Measure corrections and retries as well as elapsed time.
- Review code quality and regressions, not just whether the tool reports completion.
Use several representative tasks rather than a single showcase. Separate task completion from style preferences. Include the cost of failed attempts and the reviewer’s time when comparing value.
Source access does not settle privacy
Review the current software licence and model-service terms. A client’s source availability does not, by itself, establish that repository data stays on the device. Provider routing and enabled integrations determine where requests go.
Choosing for an actual team
List the providers and deployment controls you require, then test the supported configurations. If a tool lacks a required integration, that can decide the choice before performance is considered. If both meet the operational requirements, compare the resulting changes on your own acceptance criteria.
No original head-to-head benchmark is presented here. Previous unqualified statements about one product’s reliability or speed have been replaced with a reproducible evaluation approach.
Related: Gemini CLI and Claude Code and Claude Code setup.
Sources and verification scope
This article distinguishes documented features and vendor-reported results from independent testing. No original head-to-head benchmark dataset is published for this page; hardware-memory figures retained in the guide are estimates, not measured guarantees.
Editorial update, 21 October 2026: source references and verification scope added; identified command, feature or wording errors corrected. Read our sourcing and correction policy.