Tool profile
Claude Code by Anthropic
Claude Code is a command-line AI coding agent built by Anthropic that runs directly in your terminal. It can read, write, and edit files across your entire codebase, run shell commands, execute tests, and work through multi-step engineering tasks with minimal hand-holding. It operates on top of Claude's Sonnet and Opus models and is designed to act as an autonomous software engineer rather than just a code autocomplete tool.
Models and pricing
Everyday coding tasks: writing functions, fixing bugs, writing tests, moderate refactors
This is the default model Claude Code uses and the sweet spot for most developers. Fast enough to feel interactive, smart enough to handle real codebases, and cheaper than Opus. Start here.
Highly complex architectural tasks, large-scale refactors, or tasks requiring deep multi-step reasoning across a big codebase
Noticeably more capable on hard problems but costs roughly 5x more than Sonnet. Reserve it for genuinely difficult tasks where Sonnet is falling short. A single long Opus session can cost several dollars quickly.
Developers who want Claude Code access bundled into a flat monthly plan rather than pure API pay-as-you-go billing
If you already pay for Claude.ai Pro or Max, you can access Claude Code without a separate API key up to your plan's usage ceiling. Heavy users will likely hit limits and need API billing anyway. Check Anthropic's current terms — this bundling arrangement launched in 2025 and details may shift.
Which model should you use?
For most developers, use Claude Code with the default Sonnet model for day-to-day work and only switch to Opus when a task is genuinely stumping Sonnet — that single habit will keep your costs reasonable while still getting strong results.
How we evaluate
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