Compare / head-to-head
Claude Opus 5vsGrok 4.5
Claude Opus 5 leads 5 of 5 shared benchmarks. Grok 4.5 is 3.8x cheaper per token. Claude Opus 5 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
Claude Opus 5 leads
Cheaper per token
Grok 4.5
3.8x cheaper, input + output
Larger context
Claude Opus 5
1M tokens
Provider uptime (30d)
100% · —
Anthropic · xAI
Claude Opus 5
Anthropic · released 2026-07-24
textvision
Quality
Benchmark matrix
5 shared · 4 only Claude Opus 5 · 1 only Grok 4.5| Benchmark | Claude Opus 5 | Grok 4.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 93.9% ↗epoch | 93.4% ↗epoch | +0.5 pt | Claude Opus 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 73.2% ↗epoch | 24.4% ↗epoch | +48.8 pt | Claude Opus 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 85.6% ↗epoch | 57.2% ↗epoch | +28.4 pt | Claude Opus 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.9% ↗epoch | 97.8% ↗epoch | +1.1 pt | Claude Opus 5 |
| SimpleQA Verified | 59.9% ↗epoch | 48.3% ↗epoch | +11.6 pt | Claude Opus 5 |
| Only Claude Opus 5 reports · 4 | ||||
| Humanity's Last Exam (no tools) | 56.6% ↗ | not reported | — | — |
| CursorBench 3.2.0 | 70% ↗ | not reported | — | — |
| GDPval-AA v2 | 1824 ↗ | not reported | — | — |
| Terminal-Bench Science 0.1 | 29% ↗ | not reported | — | — |
| Only Grok 4.5 reports · 1 | ||||
| LMArena Elo | not reported | 1450.1 ↗ | — | — |
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 Opus 5 minus Grok 4.5 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 Opus 5 | Grok 4.5 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 500K tokens | Claude Opus 5 |
| Max output | 128K tokens | — | — |
| Input price / 1M | $5 ↗ | $2 ↗ | Grok 4.5 |
| Output price / 1M | $25 ↗ | $6 ↗ | Grok 4.5 |
| Cached input / 1M | $0.5 ↗ | $0.3 ↗ | Grok 4.5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $30 | $8 | Grok 4.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-07-24 | 2026-07-08 | — |
| Cited benchmark scores | 9 | 6 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Opus 5 vs …
Models sharing the most benchmarksMore matchups
Grok 4.5 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 5 and Grok 4.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.