Compare / head-to-head
GPT-5 ProvsGrok 4.3
GPT-5 Pro leads 2 of 3 shared benchmarks. Grok 4.3 is 36x cheaper per token. Grok 4.3 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
2 – 1
GPT-5 Pro leads
Cheaper per token
Grok 4.3
36x cheaper, input + output
Larger context
Grok 4.3
1M tokens
Provider uptime (30d)
94.2446% · —
OpenAI · xAI
GPT-5 Pro
OpenAI · released 2025-10-06
textvision
Quality
Benchmark matrix
3 shared · 0 only GPT-5 Pro · 3 only Grok 4.3| Benchmark | GPT-5 Pro | Grok 4.3 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| GPQA Diamond | 88.4% ↗ | 88.8% ↗epoch | -0.4 pt | Grok 4.3 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 19.5% ↗epoch | 14.6% ↗epoch | +4.9 pt | GPT-5 Pro |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 55.8% ↗epoch | 42.8% ↗epoch | +13 pt | GPT-5 Pro |
| Only GPT-5 Pro reports · 0 | ||||
| GPT-5 Pro reports nothing Grok 4.3 does not. | ||||
| Only Grok 4.3 reports · 3 | ||||
| LMArena Elo | not reported | 1397.7 ↗ | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | not reported | 93.3% ↗epoch | — | — |
| SimpleQA Verified | not reported | 33.2% ↗epoch | — | — |
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 Pro minus Grok 4.3 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 Pro | Grok 4.3 | Edge |
|---|---|---|---|
| Context window | 400K tokens | 1M tokens | Grok 4.3 |
| Max output | 272K tokens | — | — |
| Input price / 1M | $15 ↗ | $1.25 ↗ | Grok 4.3 |
| Output price / 1M | $120 ↗ | $2.5 ↗ | Grok 4.3 |
| Cached input / 1M | — | $0.2 ↗ | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $135 | $3.75 | Grok 4.3 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-10-06 | — | — |
| Cited benchmark scores | 3 | 6 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5 Pro vs …
Models sharing the most benchmarksMore matchups
Grok 4.3 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5 Pro and Grok 4.3 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.