Agentic coding
The model was trained for iterative coding work inside an agent harness rather than one-shot code completion.
Historical tool archive
Grok Code Fast 1: historical overview
Grok Code Fast 1 was xAI's low-cost agentic coding model for fast tool use in IDEs and terminal workflows. It was retired on May 15, 2026 and replaced by Grok Build 0.1.
No longer active
Archive
What Grok Code Fast 1 was
xAI launched Grok Code Fast 1 in August 2025 as a responsive coding model trained for repeated reasoning, terminal, search, and file-editing steps. It was available through the xAI API and launch partners including GitHub Copilot, Cursor, Cline, Roo Code, Kilo Code, OpenCode, and Windsurf.
Grok Code Fast 1 is no longer active as a separate model. xAI now routes its old API aliases to Grok Build 0.1 and recommends that developers migrate explicitly to the successor. This page is retained as a historical reference for teams reviewing old configurations, invoices, or model comparisons.
Past capabilities
What Grok Code Fast 1 offered
Tool use
It was designed to work with terminals, file editing, repository search, and other common development tools.
Fast responses
xAI emphasized low latency and high prompt-cache hit rates for repeated coding loops.
Broad language coverage
The launch highlighted TypeScript, Python, Java, Rust, C++, and Go.
Availability
Why this listing is historical
At launch, Grok Code Fast 1 cost $0.20 per million input tokens, $0.02 per million cached input tokens, and $1.50 per million output tokens. Those historical rates no longer apply: old aliases now route to Grok Build 0.1 under the successor's current pricing.
- Grok Code Fast 1 is no longer active as a distinct model
- Requests using its former aliases now run Grok Build 0.1, so behavior and cost differ from the original
- The launch-partner free-access offer was explicitly temporary and is no longer current
Status checked . Review the historical source ↗
Current options
Active Grok Code Fast 1 alternatives
Coding
Grok Build
Use Grok Build for xAI's current coding-agent workflow and the Grok Build 0.1 successor model.
Explore Grok Build →Consumer
Grok 4.5
Consider Grok 4.5 when stronger reasoning and broader agentic work matter more than the successor's speed-first positioning.
Explore Grok 4.5 →Coding
Claude Code
Consider Claude Code for a mature terminal-based agent with Anthropic's current coding models.
Explore Claude Code →Coding
Codex
Consider OpenAI Codex for repository-aware coding agents, parallel task workflows, and code review.
Explore Codex →Questions
Grok Code Fast 1 FAQs
Is Grok Code Fast 1 still available?
No. xAI retired it on May 15, 2026. Its old API aliases now route to Grok Build 0.1.
What replaced Grok Code Fast 1?
xAI recommends Grok Build 0.1 for agentic coding and web-development workloads.
Will old API requests fail?
The former slugs continue to resolve, but xAI serves Grok Build 0.1 instead. Developers should migrate explicitly so the model and pricing are clear.
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