Six CLI AI Coding Agents Compared: Claude Code, Aider, OpenCode and More

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The terminal-based AI coding assistant market has grown from two tools in 2024 to over ten serious contenders by 2026, each differing in autonomy, pricing, and model support. A developer spent a quarter benchmarking the leading tools, identifying Claude Code and Codex CLI as the most autonomous options, while Aider and OpenCode favour a guided, approval-based workflow. OpenCode stands out for supporting over 75 model providers, including local Ollama models, making it the most flexible choice for teams wanting to switch between AI backends. Pricing ranges widely, from fully free tiers like Antigravity and Goose to $20/month subscriptions for Claude Code and Codex CLI, with Aider and OpenCode costing under $15/month when paired with budget model providers. The author concludes that the key differentiator in 2026 is not the underlying model but how much autonomy a developer wants to grant the tool.

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