Compare / head-to-head
Claude Sonnet 5vsGrok 4.20 Reasoning
Claude Sonnet 5 leads 5 of 5 shared benchmarks. Grok 4.20 Reasoning is 3.2x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
Claude Sonnet 5 leads
Cheaper per token
Grok 4.20 Reasoning
3.2x cheaper, input + output
Larger context
Tie
both 1M tokens
Provider uptime (30d)
100% · —
Anthropic · xAI
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
Grok 4.20 Reasoning
xAI · released 2026-03-09
textvision
Quality
Benchmark matrix
5 shared · 3 only Claude Sonnet 5 · 0 only Grok 4.20 Reasoning| Benchmark | Claude Sonnet 5 | Grok 4.20 Reasoning | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 90.5% ↗epoch | 89.3% ↗epoch | +1.2 pt | Claude Sonnet 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 29.3% ↗epoch | 17.1% ↗epoch | +12.2 pt | Claude Sonnet 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 65.6% ↗epoch | 44.9% ↗epoch | +20.7 pt | Claude Sonnet 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 94.7% ↗epoch | 92.2% ↗epoch | +2.5 pt | Claude Sonnet 5 |
| SimpleQA Verified | 33.7% ↗epoch | 30.2% ↗epoch | +3.5 pt | Claude Sonnet 5 |
| Only Claude Sonnet 5 reports · 3 | ||||
| SWE-bench Verified | 85.2% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 43.2% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.4% ↗ | not reported | — | — |
| Only Grok 4.20 Reasoning reports · 0 | ||||
| Grok 4.20 Reasoning reports nothing Claude Sonnet 5 does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Sonnet 5 minus Grok 4.20 Reasoning in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Sonnet 5 | Grok 4.20 Reasoning | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | — | — |
| Input price / 1M | $2 ↗ | $1.25 ↗ | Grok 4.20 Reasoning |
| Output price / 1M | $10 ↗ | $2.5 ↗ | Grok 4.20 Reasoning |
| Cached input / 1M | $0.2 ↗ | $0.2 ↗ | Tie |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $3.75 | Grok 4.20 Reasoning |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-06-30 | 2026-03-09 | — |
| Cited benchmark scores | 8 | 5 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Sonnet 5 vs …
Models sharing the most benchmarksMore matchups
Grok 4.20 Reasoning vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 5 and Grok 4.20 Reasoning on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.