List price
Input / 1M$1.25Output / 1M$2.50Cache read / 1M$0.20Blended$2.188Value index—Last move-56.3% from 2026-07-27
models.dev · MIT · retrieved Oct 23, 2026
xAI
Grok 4.20 (Reasoning)
Grok 4.20 (Reasoning) is listed by xAI at $1.25 input and $2.5 output per million tokens. The recorded context window is 1,000,000 tokens. Release date on file: 2026-03-09. No LMArena overall rating was matched for this name, so it is left out of the Value Index. Price source: models.dev (MIT).
- Context95
- Inverse price100
- Arena—
- GPQA—
- Tools100
- Modalities67
Price history
Input and output list price. A missing day stays a gap in the line. The series is not a quality history.
Benchmarks
LMArena is CC-BY-4.0. Epoch scores, including LiveBench where Epoch publishes it, are CC-BY-4.0. A blank cell means this snapshot has no match. Nothing here is estimated.
| Benchmark | Score | Detail | Source |
|---|---|---|---|
| LMArena overall | — | — | — |
| LMArena coding | — | — | — |
| LMArena math | — | — | — |
| GPQA Diamond | — | — | — |
| LiveBench | — | — | — |
| SWE-bench Verified | — | — | — |
| Epoch Capability Index | 152.11 | 149.57–154.54 | Epoch AI Capabilities & benchmarking · CC-BY-4.0 |
Provider prices
The list row is the price used for the value index. Other rows are the same model id on models.dev, plus the LiteLLM catalog price when we have one. A split quote is kept beside the list price.
| Quote | Provider | Input / 1M | Output / 1M | Blended | Source |
|---|---|---|---|---|---|
| List | xAI | $1.25 | $2.50 | $2.188 | models.dev · MIT |
| Also listed | Merge Gateway | $1.25 | $2.50 | $2.188 | models.dev · MIT |
| Also listed | Merge Gateway | $1.25 | $2.50 | $2.188 | models.dev · MIT |
| Also listed | Impossibl | $1.25 | $2.50 | $2.188 | models.dev · MIT |
| LiteLLM | xai | $1.25 | $2.50 | $2.188 | LiteLLM model_prices_and_context_window.json · MIT |
Spec
Context1,000,000Max output30,000Inputtext, image, pdfOutputtextReleased2026-03-09Open weightsNo
Spec fields are from the models.dev row for xAI.