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OpenCode vs swarm-test

Which one should you try?

OpenCode

Free

Best for Developers who want an open-source coding agent in the terminal

Visit OpenCode See full review

swarm-test

Free

Best for Developers building or maintaining multi-agent AI systems

Visit swarm-test See full review

Pricing, capabilities and platforms side by side. Prices are as of the "Pricing checked" date in the table.

OpenCode

OpenCode

OpenCode is an MIT-licensed AI coding agent for the terminal that works with the model provider you choose, including local models. We installed it and ran three agent tasks: 9 of 9 passed with Claude Opus 5.5, 3 of 9 with a 3B local model.

swarm-test

swarm-test

The tool works by analyzing the graph structure of your multi-agent system — how agents connect, depend on, and hand off to each other — rather than running live inference. It supports CrewAI, LangGraph, AutoGen, and custom agent graphs out of the box, per the project docs. Output includes interactive reports and Mermaid visualizations suited for CI/CD pipelines and GitHub Actions. The ceiling appears when your reliability concern is runtime behavior rather than topology: swarm-test cannot catch prompt drift, model degradation, or failures that only surface under real load. Teams with those requirements run this alongside live integration testing, not instead of it.

AttributeOpenCodeswarm-test
PricingFreeFree
PriceFree (MIT). Optional Zen models pay as you go; Go $10/mo, Go Plus $40/mo—
Pricing checkedOct 19, 2026Not checked yet
Free trialNot statedNot stated
Open sourceYesYes
Has APIYesNo
Self-hosted optionYesYes
PlatformsTerminal, Desktop (beta macOS/Windows/Linux), IDE extensionPython, CLI, GitHub Actions
Pros
  • Passed all 9 of our agent tasks with Claude Opus 5.5.
  • Works with the provider you choose, including a local model behind an OpenAI-compatible server.
  • Open source under the MIT license.
  • Zero-cost static analysis — no LLM API calls are made during inspection, so teams can run reliability checks in CI without per-execution API spend or rate-limit exposure.
  • Graph-level cascade detection, so fragile dependency chains that look fine in per-agent unit tests get surfaced before they cause silent end-to-end failures in production.
  • Native GitHub Actions support via a committed action.yml, which means structural checks can be added to a PR workflow without custom scripting.
  • Framework-agnostic graph support for CrewAI, LangGraph, AutoGen, and custom topologies, so teams are not locked into a single agent framework to get pre-deployment analysis.
  • Interactive Mermaid visualizations in generated reports, so a product manager or engineering lead can read the failure risk map without parsing raw JSON or log files.
Cons
  • With a 3B local model it passed 3 of 9 tasks (only the simplest one), so plan on a larger model.
  • It reaches out to models.opencode.ai and registry.npmjs.org, and downloads provider packages on first use, so offline setups need those pre-installed.
  • The vendor lists its desktop app as beta.
  • Static analysis only covers the topology you define — it cannot detect failures caused by model behavior, prompt instability, or latency degradation at runtime. Teams whose primary reliability concern is what the model does under load will find the tool answers a different question than the one they are asking, and need a runtime observability tool instead.
  • The project has 3 stars and 1 open issue at time of curation, with no indication of a commercial backer or active contributor community. Teams that hit an edge case in graph parsing have the MIT source to work from, but no support channel and precious little community precedent to draw on.
  • Custom agent graph support requires defining your topology in a format the tool can parse — teams with bespoke orchestration logic that does not map cleanly to a supported framework spend time on schema translation before they get their first report, at which point some switch to writing their own topology-aware test harness rather than adapting an external tool.

Made up your mind?

OpenCode

Free

Best for Developers who want an open-source coding agent in the terminal

Visit OpenCode See full review

swarm-test

Free

Best for Developers building or maintaining multi-agent AI systems

Visit swarm-test See full review

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Specs come from each tool's own site and docs (how we test). AIDiveForge is editorially independent.

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