Compare / head-to-head
GPT-5.4 minivsGrok 4.20 Reasoning
Grok 4.20 Reasoning leads 4 of 5 shared benchmarks. Grok 4.20 Reasoning is 1.4x cheaper per token. Grok 4.20 Reasoning has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 4
Grok 4.20 Reasoning leads
Cheaper per token
Grok 4.20 Reasoning
1.4x cheaper, input + output
Larger context
Grok 4.20 Reasoning
1M tokens
Provider uptime (30d)
94.2446% · —
OpenAI · xAI
GPT-5.4 mini
OpenAI · released 2026-03-17
textvision
Grok 4.20 Reasoning
xAI · released 2026-03-09
textvision
Quality
Benchmark matrix
5 shared · 4 only GPT-5.4 mini · 0 only Grok 4.20 Reasoning| Benchmark | GPT-5.4 mini | Grok 4.20 Reasoning | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 88% ↗ | 89.3% ↗epoch | -1.3 pt | Grok 4.20 Reasoning |
| FrontierMath Tier 4 v2 (Epoch AI run) | 9.8% ↗epoch | 17.1% ↗epoch | -7.3 pt | Grok 4.20 Reasoning |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 51.2% ↗epoch | 44.9% ↗epoch | +6.3 pt | GPT-5.4 mini |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 88.9% ↗epoch | 92.2% ↗epoch | -3.3 pt | Grok 4.20 Reasoning |
| SimpleQA Verified | 29.4% ↗epoch | 30.2% ↗epoch | -0.8 pt | Grok 4.20 Reasoning |
| Only GPT-5.4 mini reports · 4 | ||||
| OSWorld-Verified | 72.1% ↗ | not reported | — | — |
| SWE-Bench Pro | 54.4% ↗ | not reported | — | — |
| Terminal-Bench 2.0 | 60% ↗ | not reported | — | — |
| Toolathlon | 42.9% ↗ | not reported | — | — |
| Only Grok 4.20 Reasoning reports · 0 | ||||
| Grok 4.20 Reasoning reports nothing GPT-5.4 mini 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 GPT-5.4 mini 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 | GPT-5.4 mini | Grok 4.20 Reasoning | Edge |
|---|---|---|---|
| Context window | 400K tokens | 1M tokens | Grok 4.20 Reasoning |
| Max output | 128K tokens | — | — |
| Input price / 1M | $0.75 ↗ | $1.25 ↗ | GPT-5.4 mini |
| Output price / 1M | $4.5 ↗ | $2.5 ↗ | Grok 4.20 Reasoning |
| Cached input / 1M | $0.075 ↗ | $0.2 ↗ | GPT-5.4 mini |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $5.25 | $3.75 | Grok 4.20 Reasoning |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-03-17 | 2026-03-09 | — |
| Cited benchmark scores | 10 | 5 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5.4 mini 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 GPT-5.4 mini and Grok 4.20 Reasoning on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.