Grok 4.20
by xAI · x-ai/grok-4.20 · #214 cheapest of 325 paid models
Prices updated Jul 22, 2026, 1:31 AM UTC · refreshed hourly
Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5GPT-5.6 Sol
Pricing
Input
$1.25
per 1M tokens
Output
$2.50
per 1M tokens
Blended (3:1)
$1.56
3 input : 1 output
Cache read
$0.20
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for Grok 4.20 with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $1.56 | $0.13 | — |
| 50% | $1.17 | $0.0775 | −40% |
| 90% | $0.854 | $0.0355 | −73% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates (available for OpenAI / Anthropic / Google — not flagged for this creator). Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.001375 | $1.38 |
| Document summary | 8,000 | 1,000 | $0.0125 | $12.50 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.0425 | $42.50 |
| Long-context analysis | 150,000 | 5,000 | $0.2 | $200.00 |
Performance
Intelligence Index
37
AA composite quality
Coding Index
—
Math Index
—
Agentic Index
—
Output speed
235 tok/s
median
Time to first token
16.81s
median
Time to first answer
16.81s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| GPQA Diamond | 91.1% |
| Humanity's Last Exam | 32.2% |
| SciCode | 45.6% |
| IFBench | 81.2% |
| AA-LCR (Long Context Reasoning) | 58.0% |
| Terminal-Bench Hard | 37.9% |
| τ²-Bench (Telecom) | 93.0% |
Design Arena Elo
| Category | Elo |
|---|---|
| Website | 1,255 |
| Web apps | 1,200 |
| Full-stack | 1,111 |
| Mobile apps | 1,181 |
| Android native | 1,154 |
| UI components | 1,245 |
| Data viz | 1,241 |
| SVG | 1,211 |
| 3D | 1,249 |
| Game dev | 1,255 |
| Godot game dev | 1,089 |
| HTML slides | 1,180 |
| Code categories | 1,252 |
| ASCII art | 1,219 |
Specs
Context window
2M
tokens
Max output
—
tokens
Input modalities
text, image, file
Tokenizer
Grok