Compare / head-to-head
Claude Opus 4.8vsGrok 4.6
Claude Opus 4.8 leads 3 of 5 shared benchmarks. Grok 4.6 is 3.8x cheaper per token. Claude Opus 4.8 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
3 – 2
Claude Opus 4.8 leads
Cheaper per token
Grok 4.6
3.8x cheaper, input + output
Larger context
Claude Opus 4.8
1M tokens
Provider uptime (30d)
100% · —
Anthropic · xAI
Claude Opus 4.8
Anthropic · released 2026-05-28
textvision
Quality
Benchmark matrix
5 shared · 11 only Claude Opus 4.8 · 10 only Grok 4.6| Benchmark | Claude Opus 4.8 | Grok 4.6 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 93.6% ↗ | 94% ↗epoch | -0.4 pt | Grok 4.6 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 56.1% ↗epoch | 31.7% ↗epoch | +24.4 pt | Claude Opus 4.8 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 80% ↗epoch | 66% ↗epoch | +14 pt | Claude Opus 4.8 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.3% ↗epoch | 99.2% ↗epoch | -0.9 pt | Grok 4.6 |
| SimpleQA Verified | 53% ↗epoch | 49.3% ↗epoch | +3.7 pt | Claude Opus 4.8 |
| Only Claude Opus 4.8 reports · 11 | ||||
| SWE-bench Verified | 88.6% ↗ | not reported | — | — |
| AIME 2026 | 100% ↗matharena ⚠ | not reported | — | — |
| Humanity's Last Exam (no tools) | 49.8% ↗ | not reported | — | — |
| LMArena Elo | 1452.7 ↗ | not reported | — | — |
| BrowseComp | 84.3% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.9% ↗ | not reported | — | — |
| OSWorld-Verified | 83.4% ↗ | not reported | — | — |
| SWE-bench Multilingual | 84.4% ↗ | not reported | — | — |
| SWE-bench Multimodal | 38.4% ↗ | not reported | — | — |
| SWE-Bench Pro | 69.2% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 74.6% ↗ | not reported | — | — |
| Only Grok 4.6 reports · 10 | ||||
| AA-Briefcase | not reported | 1577 ↗ | — | — |
| APEX-Agents | not reported | 57.5% ↗ | — | — |
| APEX-SWE | not reported | 56.4% ↗ | — | — |
| Artificial Analysis Intelligence Index | not reported | 61 ↗ | — | — |
| CursorBench 3.2 | not reported | 69.9% ↗ | — | — |
| DeepSWE v1.1 | not reported | 65.9% ↗ | — | — |
| FrontierCode v1.1 (Extended) | not reported | 61.3% ↗ | — | — |
| GDPVal-AA v2 | not reported | 1753 ↗ | — | — |
| Harvey LAB (Vals) | not reported | 15.8% ↗ | — | — |
| Terminal-Bench 3.0 | not reported | 26% ↗ | — | — |
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 4.8 minus Grok 4.6 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 4.8 | Grok 4.6 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 500K tokens | Claude Opus 4.8 |
| Max output | 128K tokens | — | — |
| Input price / 1M | $5 ↗ | $2 ↗ | Grok 4.6 |
| Output price / 1M | $25 ↗ | $6 ↗ | Grok 4.6 |
| Cached input / 1M | $0.5 ↗ | $0.5 ↗ | Tie |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $30 | $8 | Grok 4.6 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-05-28 | 2026-08-12 | — |
| Cited benchmark scores | 17 | 15 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Opus 4.8 vs …
Models sharing the most benchmarksMore matchups
Grok 4.6 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 4.8 and Grok 4.6 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.