Compare / head-to-head
GPT-6 Lunavs
Grok 4
GPT-6 Luna leads 5 of 5 shared benchmarks. GPT-6 Luna has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
GPT-6 Luna leads
Cheaper per token
—
list price, input + output
Larger context
GPT-6 Luna
1.1M tokens
Providers
2 providers
OpenAI · xAI
GPT-6 Luna
OpenAI · released 2026-09-22
textvision
Grok 4
xAI · released 2025-07-09
textvision
- Context
- 256K
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 17 · 8 core
Quality
Benchmark matrix
5 shared · 17 only GPT-6 Luna · 12 only Grok 4| Benchmark | GPT-6 Luna | Grok 4 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 90.5% ↗epoch run | 87% ↗epoch run | +3.5 pt | GPT-6 Luna |
| LMArena Elo | 1442.9 ↗ | 1410.8 ↗ | +32.1 | GPT-6 Luna |
| Chess Puzzles (Epoch AI run) | 31% ↗epoch run | 28% ↗epoch run | +3 pt | GPT-6 Luna |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.9% ↗epoch run | 84% ↗epoch run | +14.9 pt | GPT-6 Luna |
| SAGE (Vals AI) | 48.1% ↗ | 25.1% ↗ | +23 pt | GPT-6 Luna |
| Only GPT-6 Luna reports · 17 | ||||
| APEX-Agents (Mercor) | 44.3% ↗ | not reported | — | — |
| DeepSWE v1.1 | 66.6% ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 56.1% ↗epoch run | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 78.9% ↗epoch run | not reported | — | — |
| Furniture Assembly (Epoch AI run) | 44.2% ↗epoch run | not reported | — | — |
| LiveBench Agentic Coding (LiveBench) | 51.2% ↗ | not reported | — | — |
| LiveBench Coding (LiveBench) | 79% ↗ | not reported | — | — |
| LiveBench Data Analysis (LiveBench) | 73.4% ↗ | not reported | — | — |
| LiveBench Instruction Following (LiveBench) | 55.9% ↗ | not reported | — | — |
| LiveBench Language (LiveBench) | 73.8% ↗ | not reported | — | — |
| LiveBench Mathematics (LiveBench) | 89.1% ↗ | not reported | — | — |
| LiveBench Reasoning (LiveBench) | 81.8% ↗ | not reported | — | — |
| LMArena Agent (LMArena) | 0.0135 ↗ | not reported | — | — |
| LMArena WebDev (LMArena) | 1578.7 ↗ | not reported | — | — |
| Mystery Game Puzzles (Epoch AI run) | 7% ↗epoch run | not reported | — | — |
| SimpleQA Verified | 41.4% ↗epoch run | not reported | — | — |
| Terminal-Bench 4.0 (Vals AI) | 13.6% ↗ | not reported | — | — |
| Only Grok 4 reports · 12 | ||||
| AIME 2025 | not reported | 91.7% ↗ | — | — |
| Humanity's Last Exam (no tools) | not reported | 25.4% ↗ | — | — |
| ARC-AGI-2 | not reported | 15.9% ↗ | — | — |
| BALROG (BALROG) | not reported | 43.6% ↗ | — | — |
| GPQA (no tools) | not reported | 87.5% ↗ | — | — |
| HMMT 2025 (no tools) | not reported | 90% ↗ | — | — |
| Humanity's Last Exam (with tools) | not reported | 38.6% ↗ | — | — |
| LiveCodeBench (Jan - May) | not reported | 79% ↗ | — | — |
| LMArena Vision (LMArena) | not reported | 1184.2 ↗ | — | — |
| SimpleBench (SimpleBench) | not reported | 60.5% ↗ | — | — |
| USAMO 2025 (no tools) | not reported | 37.5% ↗ | — | — |
| WeirdML (Håvard Tveit Ihle) | not reported | 45.7% ↗ | — | — |
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-6 Luna minus Grok 4 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-6 Luna | Grok 4 | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 256K tokens | GPT-6 Luna |
| Max output | 128K tokens | — | — |
| Input price / 1M | $0.1 ↗ | — | — |
| Output price / 1M | $0.5 ↗ | — | — |
| Cached input / 1M | $0.01 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.6 | — | — |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-09-22 | 2025-07-09 | — |
| Cited benchmark scores | 22 | 17 | — |
Reliability
Provider status
Live from /statusMore matchups
GPT-6 Luna vs …
Models sharing the most benchmarksMore matchups
Grok 4 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-6 Luna and Grok 4 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.