xAI Grok Build 0.1 API: $1/M Token — How It Stacks Up Against Claude and GPT for Coding

Grok Build 0.1 Is Now a Real API Option

xAI has launched Grok Build 0.1 into public API beta. This is a coding-focused model trained specifically for agentic development tasks — web development, debugging, and MCP tool use — running at over 100 tokens per second. Pricing is set at $1.00 per million input tokens and $2.00 per million output tokens, putting it squarely in the mid-range tier alongside GPT-5.4 Mini and below Claude Sonnet 4.6.

The model is available via both the xAI API directly and through OpenRouter and Vercel AI Gateway, which means it slots into any routing setup that already uses those platforms. For developers already running multi-model routing, adding Grok Build 0.1 as a coding-specific route requires minimal integration work.

Pricing Position in the 2026 Coding Model Market

Grok Build 0.1's output pricing of $2.00 per million is the real story. At the same $1.00 input price as Haiku 4.5, it undercuts Haiku's $5.00 output price by 60%. For agentic coding workflows where output tokens dominate the bill — which is typical for code generation tasks — this is a meaningful cost advantage. A workflow generating 2 million output tokens costs $10 on Haiku 4.5 but only $4 on Grok Build 0.1.

Where Grok Build 0.1 Fits in a Routing Strategy

Given the pricing position, Grok Build 0.1 is best evaluated as a mid-tier coding alternative, not a frontier replacement. The model sits in a useful gap: cheaper than Claude Sonnet 4.6 by a factor of 7-8x on output tokens, but purpose-built for agentic coding tasks rather than being a watered-down general model.

Practical routing candidates:

• Web component generation, boilerplate scaffolding: Grok Build 0.1's coding focus and high speed make it competitive here. Compare output quality against Haiku 4.5 before routing.
• Debugging loops with high iteration count: The low output price matters most when you are running many iterations. At 100+ tok/s, the speed also keeps interactive sessions responsive.
• MCP tool use workflows: xAI explicitly supports MCP, meaning Grok Build 0.1 works with the same tool integrations you already use with Claude Code.

Grok Build 0.1 is version 0.1, not a polished production model. Expect rough edges, inconsistent behavior on complex reasoning tasks, and benchmark results that have not been independently verified at scale. Treat it as a useful routing option to test against your specific workloads, not a replacement for your primary model until you have your own production data.

Monthly Cost Comparison for a Typical Developer

Assume a solo developer running 500K input tokens and 2M output tokens per month on coding tasks:

If Grok Build 0.1 delivers comparable output quality to Haiku 4.5 for coding tasks, it saves 57% vs Haiku and 86% vs Sonnet 4.6 on this usage profile. That is a meaningful saving worth testing — just validate the output quality on your actual tasks before routing production work. Use the AI Cost Estimator to model your own token volume and compare across models.