Compare / head-to-head
Claude Opus 4.8vs
GPT-6 Luna
Claude Opus 4.8 leads 15 of 21 shared benchmarks. GPT-6 Luna is 50x cheaper per token. 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
15 – 5
Claude Opus 4.8 leads · 1 tied
Cheaper per token
GPT-6 Luna
50x cheaper, input + output
Larger context
GPT-6 Luna
1.1M tokens
Providers
2 providers
Anthropic · OpenAI
Claude Opus 4.8
Anthropic · released 2026-05-28
textvision
GPT-6 Luna
OpenAI · released 2026-09-22
textvision
Quality
Benchmark matrix
21 shared · 19 only Claude Opus 4.8 · 1 only GPT-6 Luna| Benchmark | Claude Opus 4.8 | GPT-6 Luna | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 21 | ||||
| GPQA Diamond | 93.6% ↗ | 90.5% ↗epoch run | +3.1 pt | Claude Opus 4.8 |
| LMArena Elo | 1452.7 ↗ | 1442.9 ↗ | +9.8 | Claude Opus 4.8 |
| APEX-Agents (Mercor) | 48.9% ↗ | 44.3% ↗ | +4.6 pt | Claude Opus 4.8 |
| Chess Puzzles (Epoch AI run) | 34% ↗epoch run | 31% ↗epoch run | +3 pt | Claude Opus 4.8 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 56.1% ↗epoch run | 56.1% ↗epoch run | 0 | Tie |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 80% ↗epoch run | 78.9% ↗epoch run | +1.1 pt | Claude Opus 4.8 |
| Furniture Assembly (Epoch AI run) | 42.5% ↗epoch run | 44.2% ↗epoch run | -1.7 pt | GPT-6 Luna |
| LiveBench Agentic Coding (LiveBench) | 50.5% ↗ | 51.2% ↗ | -0.7 pt | GPT-6 Luna |
| LiveBench Coding (LiveBench) | 81.8% ↗ | 79% ↗ | +2.8 pt | Claude Opus 4.8 |
| LiveBench Data Analysis (LiveBench) | 66% ↗ | 73.4% ↗ | -7.4 pt | GPT-6 Luna |
| LiveBench Instruction Following (LiveBench) | 72% ↗ | 55.9% ↗ | +16.1 pt | Claude Opus 4.8 |
| LiveBench Language (LiveBench) | 79.7% ↗ | 73.8% ↗ | +5.9 pt | Claude Opus 4.8 |
| LiveBench Mathematics (LiveBench) | 94.3% ↗ | 89.1% ↗ | +5.2 pt | Claude Opus 4.8 |
| LiveBench Reasoning (LiveBench) | 89.2% ↗ | 81.8% ↗ | +7.4 pt | Claude Opus 4.8 |
| LMArena Agent (LMArena) | 0.0664 ↗ | 0.0135 ↗ | +0.1 | Claude Opus 4.8 |
| LMArena WebDev (LMArena) | 1555.5 ↗ | 1578.7 ↗ | -23.2 | GPT-6 Luna |
| Mystery Game Puzzles (Epoch AI run) | 36% ↗epoch run | 7% ↗epoch run | +29 pt | Claude Opus 4.8 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.3% ↗epoch run | 98.9% ↗epoch run | -0.6 pt | GPT-6 Luna |
| SAGE (Vals AI) | 54.8% ↗ | 48.1% ↗ | +6.7 pt | Claude Opus 4.8 |
| SimpleQA Verified | 53% ↗epoch run | 41.4% ↗epoch run | +11.6 pt | Claude Opus 4.8 |
| Terminal-Bench 4.0 (Vals AI) | 23.2% ↗ | 13.6% ↗ | +9.6 pt | Claude Opus 4.8 |
| Only Claude Opus 4.8 reports · 19 | ||||
| SWE-bench Verified | 88.6% ↗ | not reported | — | — |
| AIME 2026 | 100% ↗matharena ⚠ | not reported | — | — |
| Humanity's Last Exam (no tools) | 49.8% ↗ | not reported | — | — |
| BrowseComp | 84.3% ↗ | not reported | — | — |
| DeepSWE v1.1 (Datacurve) | 59% ↗ | not reported | — | — |
| EBR-bench (Epoch AI run) | 28.6% ↗epoch run | not reported | — | — |
| GSO Opt@1 (GSO) | 47.1% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.9% ↗ | not reported | — | — |
| LMArena Vision (LMArena) | 1286.4 ↗ | not reported | — | — |
| OSWorld-Verified | 83.4% ↗ | not reported | — | — |
| SimpleBench (SimpleBench) | 64.8% ↗ | not reported | — | — |
| SWE-bench Multilingual | 84.4% ↗ | not reported | — | — |
| SWE-bench Multimodal | 38.4% ↗ | not reported | — | — |
| SWE-Bench Pro | 69.2% ↗ | not reported | — | — |
| tau2-bench Banking Knowledge (Sierra) | 39.7% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 74.6% ↗ | not reported | — | — |
| Toolathlon-Verified (HKUST) | 76.2% ↗ | not reported | — | — |
| Vending-Bench 2 (Andon Labs) | 5787.43 ↗ | not reported | — | — |
| WeirdML (Håvard Tveit Ihle) | 82.9% ↗ | not reported | — | — |
| Only GPT-6 Luna reports · 1 | ||||
| DeepSWE v1.1 | not reported | 66.6% ↗ | — | — |
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 GPT-6 Luna 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 | GPT-6 Luna | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1.1M tokens | GPT-6 Luna |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $5 ↗ | $0.1 ↗ | GPT-6 Luna |
| Output price / 1M | $25 ↗ | $0.5 ↗ | GPT-6 Luna |
| Cached input / 1M | $0.5 ↗ | $0.01 ↗ | GPT-6 Luna |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $30 | $0.6 | GPT-6 Luna |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-05-28 | 2026-09-22 | — |
| Cited benchmark scores | 47 | 22 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Opus 4.8 vs …
Models sharing the most benchmarksMore matchups
GPT-6 Luna 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 GPT-6 Luna on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.