Quality
How xAI: Grok 4.20 compares against every tracked model
Composite of GPQA Diamond, Mock AIME 2024–25, MATH Level 5, SWE-bench Verified, LiveBench, Humanity's Last Exam and Terminal-Bench, normalised 0–100. Scores are ingested from Epoch AI; we do not run these evaluations.
Quality Breakdown
xAI: Grok 4.20 on each evaluation feeding the index, against the tracked average
Bar = xAI: Grok 4.20 · grey marker = average across tracked models · scores ingested from Epoch AI
Arena Elo
Human preference rating from blind pairwise votes
Elo from blind pairwise votes, ingested from Arena
xAI: Grok 4.20 does not currently appear in any arena we ingest.
Price & Cost
Published API pricing by token type
USD per 1M tokens at a 3:1 input:output blend. Live from OpenRouter, cross-checked against models.dev. Lower is better.
Context Window
Maximum input tokens accepted
Maximum input context from provider metadata via models.dev and OpenRouter. Higher is better.
Speed
Median output throughput across hosting providers
Median output tokens per second across all tracked providers. Derived from OpenRouter endpoint telemetry. Higher is better.
Latency
Time to first token, median across providers
Seconds to first streamed chunk, median across tracked providers. Derived from OpenRouter endpoint telemetry. Lower is better.
Providers
Hosts serving xAI: Grok 4.20, with their own price and speed
| Provider | Input $/M | Output $/M | Blended | Speed | TTFT | Context |
|---|---|---|---|---|---|---|
| xAI · first party | $1.25 | $2.50 | $1.56 | 198 | 0.3s | 2.00M |
Per-host pricing and telemetry from OpenRouter. Speed is output tokens per second; TTFT is time to first token.
History
How price and quality have moved since we began tracking this model
Since 25 Jul 2026
| Known Good Index | — |
| Blended price | $1.56 per 1M · observed 29 Jul 2026 |
| Output speed | 166 tok/s · observed 29 Jul 2026 |
| Time to first token | 0.4s |
No recorded changes for this model since tracking began.
Comparisons
Head-to-head pages pairing xAI: Grok 4.20 with other tracked models
Head-to-head pages are generated for the top 50 models by Known Good Index, which xAI: Grok 4.20 is not currently in. Its nearest tracked models by index are below.