Model comparison
Grok Build 0.1 vs Grok 4.20 Reasoning
Compare Grok Build 0.1 vs Grok 4.20 Reasoning API pricing: input/output token costs, cache pricing, context windows, workload estimates, and routing fit.
Grok Build 0.1
xai · grok-build-0.1
- Input
- $1
- Output
- $2
- Context
- 256K
Grok 4.20 Reasoning
xai · grok-4.20-0309-reasoning
- Input
- $1.25
- Output
- $2.5
- Context
- 1M
Quick take
Grok Build 0.1 has the lower input price at $1 per 1M input tokens. Grok Build 0.1 is cheaper for the example blended workload below. Grok 4.20 Reasoning has the larger context window at 1M tokens.
Choose Grok Build 0.1 if...
- Grok Build 0.1 is the better default for cost-sensitive traffic and repeated high-volume calls.
Choose Grok 4.20 Reasoning if...
- Grok 4.20 Reasoning is safer for long documents, repository analysis, and RAG prompts because it has the larger context window.
Example workload cost
Estimates use input tokens plus 20% output tokens. They exclude provider discounts, cache hits, and tool/search surcharges.
| Workload | Grok Build 0.1 | Grok 4.20 Reasoning | Cheaper |
|---|---|---|---|
| 1M input + 200K output | $1.40 | $1.75 | Grok Build 0.1 |
| 10M input + 2M output | $14.00 | $17.50 | Grok Build 0.1 |
| 100M input + 20M output | $140.00 | $175.00 | Grok Build 0.1 |
Context, output, and capability fit
Grok 4.20 Reasoning provides the larger context window. Check max output separately when the task needs long reports, code generation, or full-document rewrites.
- Grok Build 0.1 max output
- n/a
- Grok 4.20 Reasoning max output
- n/a
- Grok Build 0.1 features
- prompt caching, function calling, vision
- Grok 4.20 Reasoning features
- prompt caching, function calling, vision
Risk notes for Grok Build 0.1
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Risk notes for Grok 4.20 Reasoning
- No major capability risk is flagged in this snapshot, but provider pages should still be verified before production routing.
Routing tags
budgetcodingreasoningagentslong-contextmultimodalcache-friendlyragfrontier