xAI
4 models built · 4 served
xAI Corp. builds the Grok model family, tied closely to the X platform, and has been operating since 2023. On OpenKey the lineup is small — 4 models, all paid, no free tier — which fits a lab that ships fewer, higher-capability models rather than a wide budget tier. Every current Grok model (4.20, 4.20 Multi-Agent, and 4.3) shares text+image+file input, so multimodal support is standard across the family, not a per-model feature. The newest release, Grok Build 0.1, narrows scope to text+image and targets a smaller 256K context window, suggesting a purpose-built variant rather than a general flagship replacement. Pricing across the three main Grok models is nearly identical, so the real differentiator between them is context length and agent structure, not cost.
Lineup
For most work, Grok 4.20 is the practical default: $1.25 input / $2.50 output per 1M tokens with a 2M token context window — same price as Grok 4.3 but double the context. Grok 4.3 costs the same ($1.25/$2.50) with a 1M window, and it's the one with a public benchmark result (design_arena pptxslides rank 9). Grok 4.20 Multi-Agent matches 4.20 on price and context but is built for multi-agent workflows rather than single-model calls. If you need a smaller footprint or lower latency and don't need file input, Grok Build 0.1 is cheaper on input ($1.00) with a 256K window, but it drops file support and full multimodal input.
- Grok Build 0.1May 20, 2026 256K $1.03 $2.06 ctx 256K · in $1.03 · out $2.06
- Grok 4.3Apr 30, 2026 1M $1.29 $2.58 ctx 1M · in $1.29 · out $2.58
- Grok 4.20Mar 31, 2026 2M $1.29 $2.58 ctx 2M · in $1.29 · out $2.58
- Grok 4.20 Multi-AgentMar 31, 2026 2M $1.29 $2.58 ctx 2M · in $1.29 · out $2.58
Prices per 1M tokens, flat 3% fee included.
Models xAI serves
Beyond its own models, xAI hosts 4 models in the OpenKey catalog. Prices are xAI’s own list price per 1M input tokens, before our fee.
| Model | Built by | Context | Input /M |
|---|---|---|---|
| Grok 4.20 | xAI | 2M | $1.25 |
| Grok 4.20 Multi-Agent | xAI | 2M | $1.25 |
| Grok 4.3 | xAI | 1M | $1.25 |
| Grok Build 0.1 | xAI | 256K | $1.00 |
From the OpenRouter catalog, Jul 28, 2026. All providers
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Questions
- What does xAI charge for Grok on OpenKey?
- Grok 4.20, Grok 4.20 Multi-Agent, and Grok 4.3 are all $1.25 per 1M input tokens and $2.50 per 1M output tokens on the provider side. On OpenKey that's $1.29 / $2.58 after the flat 3% fee ($1.25 × 1.03, $2.50 × 1.03). Grok Build 0.1 is cheaper: $1.00 input / $2.00 output, or $1.03 / $2.06 on OpenKey.
- Which Grok model should I use by default?
- Grok 4.20. It's priced identically to Grok 4.3 ($1.25/$2.50) but gives you a 2M token context window versus 1M, with the same text+image+file modality. Use Grok 4.3 if you specifically want its benchmarked performance profile, and Grok 4.20 Multi-Agent if your workload is structured around multiple coordinating agents.
- Is there a free xAI model on OpenKey?
- No. xAI has 4 models on OpenKey and none are free — all four (Grok 4.20, Grok 4.20 Multi-Agent, Grok 4.3, Grok Build 0.1) are paid, ranging from $1.00 to $1.25 per 1M input tokens on the provider side.