Compare / head-to-head
Gemini 3 Flash PreviewvsGPT-5.6 Luna
GPT-5.6 Luna leads 4 of 5 shared benchmarks. GPT-5.6 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
1 – 4
GPT-5.6 Luna leads
Cheaper per token
—
list price, input + output
Larger context
GPT-5.6 Luna
1.1M tokens
Provider uptime (30d)
100% · 95.389%
Google · OpenAI
Gemini 3 Flash Preview
Google · released 2025-12-17
textvisionaudio
- Context
- 1.0M
- Max out
- 66K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 13 · 9 core
GPT-5.6 Luna
OpenAI · released 2026-07-09
textvision
Quality
Benchmark matrix
5 shared · 6 only Gemini 3 Flash Preview · 2 only GPT-5.6 Luna| Benchmark | Gemini 3 Flash Preview | GPT-5.6 Luna | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 90.4% ↗ | 92.3% ↗ | -1.9 pt | GPT-5.6 Luna |
| FrontierMath Tier 4 v2 (Epoch AI run) | 17.1% ↗epoch | 61% ↗epoch | -43.9 pt | GPT-5.6 Luna |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 51.2% ↗epoch | 82.1% ↗epoch | -30.9 pt | GPT-5.6 Luna |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 95.6% ↗epoch | 98.3% ↗epoch | -2.7 pt | GPT-5.6 Luna |
| SimpleQA Verified | 68.7% ↗ | 41% ↗epoch | +27.7 pt | Gemini 3 Flash Preview |
| Only Gemini 3 Flash Preview reports · 6 | ||||
| SWE-bench Verified | 78% ↗ | not reported | — | — |
| AIME 2025 | 95.2% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 33.7% ↗ | not reported | — | — |
| MMMU-Pro | 81.2% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 75.4% ↗epoch | not reported | — | — |
| Terminal-Bench 2.0 | 47.6% ↗ | not reported | — | — |
| Only GPT-5.6 Luna reports · 2 | ||||
| DeepSWE v1.1 | not reported | 67.2% ↗ | — | — |
| SWE-Bench Pro | not reported | 62.7% ↗ | — | — |
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 Gemini 3 Flash Preview minus GPT-5.6 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 | Gemini 3 Flash Preview | GPT-5.6 Luna | Edge |
|---|---|---|---|
| Context window | 1.0M tokens | 1.1M tokens | GPT-5.6 Luna |
| Max output | 66K tokens | 128K tokens | GPT-5.6 Luna |
| Input price / 1M | — | $0.2 ↗ | — |
| Output price / 1M | — | $1.2 ↗ | — |
| Cached input / 1M | — | $0.02 ↗ | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | $1.4 | — |
| Modalities | text · vision · audio | text · vision | Gemini 3 Flash Preview |
| Released | 2025-12-17 | 2026-07-09 | — |
| Cited benchmark scores | 13 | 8 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Gemini 3 Flash Preview vs …
Models sharing the most benchmarksMore matchups
GPT-5.6 Luna vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Gemini 3 Flash Preview and GPT-5.6 Luna on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.