Grok Build Costs $2.49 a Task, Opus 4.8 Costs $11.80

xAI priced a Grok Build coding task at $2.49 on July 8, against $11.80 for Claude Code on Opus 4.8, per TechTimes. That price gap is what budget-conscious teams will care about most. Grok Build runs at roughly a fifth of Claude Code's cost per task, on scores close to frontier level.

Grok Build hit 83.3% on Terminal-Bench 2.1 and 64.7% on SWE-Bench Pro. It got there on about 15,954 output tokens, a quarter of the roughly 67,020 tokens Opus 4.8 used on the same task.

The catch, flagged separately from the benchmark scores: hallucination rates are up. A cheap task that comes back as a confident wrong patch you merge anyway isn't cheap at all.

There's a second bill. The Grok Build CLI was caught silently uploading entire repos, Git history included, to an xAI cloud bucket. The $2.49 sticker price doesn't include what it costs when your codebase leaves the building without you choosing to send it.

The move isn't switching wholesale. Run Grok on work where a hallucination is cheap to catch, refactors with solid test coverage, mechanical migrations, throwaway prototypes.

Keep the high-stakes, hard-to-verify work on the model you trust. My bet: the repo-upload story costs Grok Build more adoption than the hallucination rate does.

Trust in data handling is harder to win back than trust in a single patch. Watch whether xAI changes the CLI's default upload behavior, or teams route around it instead.