Grok 4.20 (Reasoning) is an AI model by xAI. View detailed benchmark scores, pricing data, and performance metrics on Serenities AI Models.
Specifications last checked against the provider on . Benchmark scores carry their own source, linked beside each number.
Coding Benchmarks
Human preference ELO for building things — websites, UI, games, charts, SVG
Design Arena (via OpenRouter)Human preference ELO for building a working web page from a brief
Design Arena (via OpenRouter)Cost Benchmarks
Cost per 1M cached input tokens — the price that actually applies to a long agent conversation
OpenRouter APIContext Benchmarks
Available from 12 providers
The same model costs different amounts depending on who serves it. You can bring your own key for 4 of these — connect it here.
| Provider | Input / 1M | Output / 1M | Cached in | Context | Your key |
|---|---|---|---|---|---|
| DevPass (LLM Gateway) | $1.25 | $2.5 | $0.2 | 2.0M | — |
| Eden AI | $1.25 | $2.5 | $0.2 | 1.0M | — |
| Impossibl | $1.25 | $2.5 | $0.2 | 1.0M | — |
| Merge Gateway | $1.25 | $2.5 | $0.2 | 1.0M | — |
| OpenRouter | $1.25 | $2.5 | $0.2 | 2.0M | Supported |
| Vertex | $1.25 | $2.5 | $0.2 | 2.0M | Supported |
| xAI | $1.25 | $2.5 | $0.2 | 1.0M | Supported |
| Venice AI | $1.42 | $2.83 | $0.23 | 2.0M | — |
| Azure | $2 | $6 | — | 262K | Supported |
| Cloudflare AI Gateway | $2 | $6 | $0.2 | 2.0M | — |
| NanoGPT | $2 | $6 | $1 | 2.0M | — |
| Ofox | $4 | $12 | $0.4 | 2.0M | — |
Grok 4.20 (Reasoning) — Benchmark Scores Overview
Scores normalized to percentage scale for visual comparison. ELO scores mapped to 0-100 range (1100-1500).
Grok 4.20 (Reasoning) — Frequently Asked Questions
How much does Grok 4.20 (Reasoning) cost?
Grok 4.20 (Reasoning) costs $1.3 per 1M input tokens and $2.5 per 1M output tokens. This is mid-range pricing for its capability level.
What is the context window of Grok 4.20 (Reasoning)?
Grok 4.20 (Reasoning) has a context window of 2.0M tokens. This determines how much text, conversation history, and code the model can process in a single request.
Who created Grok 4.20 (Reasoning)?
Grok 4.20 (Reasoning) was created by xAI. It is classified as a mid model in our catalogue.
Is Grok 4.20 (Reasoning) open source?
No, Grok 4.20 (Reasoning) is a proprietary model. It is available through xAI's API and compatible providers.