The terminal-based AI coding assistant space has exploded. What was a two-tool market in 2024 (GitHub Copilot CLI and... nothing) has become a crowded field of 10+ serious contenders, each with different architectures, pricing models, and philosophical approaches to how AI should assist developers.
I spent the last quarter benchmarking all of them. Here's what I found.
| Tool | Best For | Starting Price | Key Strength |
|---|---|---|---|
| Claude Code | |||
| Autonomous execution | $20/mo (Pro) | Sub-agent architecture, multi-file refactoring | |
| Codex CLI | |||
| Intelligence-per-dollar | ChatGPT Plus ($20/mo) | GPT-5.5 reasoning, Rust performance | |
| OpenCode | |||
| Provider flexibility | API keys only | 75+ providers, local models | |
| Aider | |||
| Git safety | Free + API tokens | Auto-commits every change | |
| Antigravity | |||
| Free tier | Free (60 req/min) | Zero-cost entry point | |
| Goose | |||
| Multi-model | Free | Serverless architecture |
The defining axis in 2026 isn't which model runs under the hood — it's how much autonomy you want.
Claude Code and Codex CLI represent the "full autonomy" end: give them a task, and they'll plan, code, test, and iterate without your input. Aider and OpenCode sit at the "guided pair programming" end: every change is proposed, reviewed, and committed with explicit approval.
Neither approach is universally better. If you're doing well-understood refactoring tasks (rename this API, add error handling), autonomy saves hours. If you're building something novel or architecturally complex, guided interaction prevents costly mistakes.
The most interesting tool that doesn't get enough attention is OpenCode. It supports 75+ model providers including local Ollama models — meaning you can run the same CLI workflow against GPT-5.5, Claude Opus 4.8, DeepSeek, or a local 7B model on your laptop. This flexibility is unique in the space and makes OpenCode the best choice if you want to experiment across models without switching tools.
The pricing models vary dramatically:
For cost-conscious teams, Aider or OpenCode with a cheap model provider (DeepSeek, Gemini) gives you CLI AI assistance for under $15/month. This is a condensed version. The full comparison with detailed benchmarks, SWE-bench scores, and workflow examples for each tool is on my site: