Compare / head-to-head
GPT-5.4vsGrok 4 Fast Reasoning
GPT-5.4 leads 3 of 3 shared benchmarks. Grok 4 Fast Reasoning is 25x cheaper per token. Grok 4 Fast Reasoning has the larger context window (2M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
3 – 0
GPT-5.4 leads
Cheaper per token
Grok 4 Fast Reasoning
25x cheaper, input + output
Larger context
Grok 4 Fast Reasoning
2M tokens
Provider uptime (30d)
95.3216% · —
OpenAI · xAI
GPT-5.4
OpenAI · released 2026-03-05
textvision
Grok 4 Fast Reasoning
xAI · released 2025-09-19
text
Quality
Benchmark matrix
3 shared · 17 only GPT-5.4 · 9 only Grok 4 Fast Reasoning| Benchmark | GPT-5.4 | Grok 4 Fast Reasoning | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| GPQA Diamond | 92.8% ↗ | 85.7% ↗ | +7.1 pt | GPT-5.4 |
| Humanity's Last Exam (no tools) | 39.8% ↗ | 20% ↗ | +19.8 pt | GPT-5.4 |
| BrowseComp | 82.7% ↗ | 44.9% ↗ | +37.8 pt | GPT-5.4 |
| Only GPT-5.4 reports · 17 | ||||
| AIME 2026 | 99.2% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1452.6 ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 49% ↗epoch | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 78.6% ↗epoch | not reported | — | — |
| GDPval (wins or ties) | 83% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 52.1% ↗ | not reported | — | — |
| MCP Atlas | 67.2% ↗ | not reported | — | — |
| MMMU-Pro (no tools) | 81.2% ↗ | not reported | — | — |
| MMMU-Pro (with tools) | 82.1% ↗ | not reported | — | — |
| OSWorld-Verified | 75% ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 97.8% ↗epoch | not reported | — | — |
| SimpleQA Verified | 45.1% ↗epoch | not reported | — | — |
| SWE-Bench Pro | 57.7% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 76.9% ↗epoch | not reported | — | — |
| Tau2-bench Telecom | 98.9% ↗ | not reported | — | — |
| Terminal-Bench 2.0 | 75.1% ↗ | not reported | — | — |
| Toolathlon | 54.6% ↗ | not reported | — | — |
| Only Grok 4 Fast Reasoning reports · 9 | ||||
| AIME 2025 | not reported | 92% ↗ | — | — |
| BrowseComp (zh) | not reported | 51.2% ↗ | — | — |
| HMMT 2025 (no tools) | not reported | 93.3% ↗ | — | — |
| LiveCodeBench (Jan-May) | not reported | 80% ↗ | — | — |
| Reka Research Eval | not reported | 66% ↗ | — | — |
| Search Arena Elo | not reported | 1163 ↗ | — | — |
| SimpleQA | not reported | 95% ↗ | — | — |
| X Bench Deepsearch (zh) | not reported | 74% ↗ | — | — |
| X Browse | not reported | 58% ↗ | — | — |
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 minus Grok 4 Fast 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 | Grok 4 Fast Reasoning | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 2M tokens | Grok 4 Fast Reasoning |
| Max output | 128K tokens | — | — |
| Input price / 1M | $2.5 ↗ | $0.2 ↗ | Grok 4 Fast Reasoning |
| Output price / 1M | $15 ↗ | $0.5 ↗ | Grok 4 Fast Reasoning |
| Cached input / 1M | $0.25 ↗ | $0.05 ↗ | Grok 4 Fast Reasoning |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $17.5 | $0.7 | Grok 4 Fast Reasoning |
| Modalities | text · vision | text | GPT-5.4 |
| Released | 2026-03-05 | 2025-09-19 | — |
| Cited benchmark scores | 21 | 12 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5.4 vs …
Models sharing the most benchmarksMore matchups
Grok 4 Fast 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 and Grok 4 Fast Reasoning on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.