Compare / head-to-head
Gemini 3.5 FlashvsGPT-5.6 Terra
GPT-5.6 Terra leads 4 of 5 shared benchmarks. Gemini 3.5 Flash is 1.3x cheaper per token. GPT-5.6 Terra 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 Terra leads
Cheaper per token
Gemini 3.5 Flash
1.3x cheaper, input + output
Larger context
GPT-5.6 Terra
1.1M tokens
Provider uptime (30d)
100% · 94.9843%
Google · OpenAI
Gemini 3.5 Flash
Google · released 2026-05-19
textvisionaudio
GPT-5.6 Terra
OpenAI · released 2026-07-09
textvision
Quality
Benchmark matrix
5 shared · 10 only Gemini 3.5 Flash · 2 only GPT-5.6 Terra| Benchmark | Gemini 3.5 Flash | GPT-5.6 Terra | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 92.8% ↗epoch | 92.9% ↗ | -0.1 pt | GPT-5.6 Terra |
| FrontierMath Tier 4 v2 (Epoch AI run) | 26.8% ↗epoch | 70.7% ↗epoch | -43.9 pt | GPT-5.6 Terra |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 62.8% ↗epoch | 86% ↗epoch | -23.2 pt | GPT-5.6 Terra |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 95.6% ↗epoch | 99.7% ↗epoch | -4.1 pt | GPT-5.6 Terra |
| SimpleQA Verified | 66.2% ↗epoch | 43.2% ↗epoch | +23 pt | Gemini 3.5 Flash |
| Only Gemini 3.5 Flash reports · 10 | ||||
| AIME 2026 | 95% ↗matharena ⚠ | not reported | — | — |
| ARC-AGI-2 | 72.1% ↗ | not reported | — | — |
| GDPVal-AA | 1656 ↗ | not reported | — | — |
| Humanity's Last Exam (full set, text + MM) | 40.2% ↗ | not reported | — | — |
| MCP Atlas | 83.6% ↗ | not reported | — | — |
| MMMU-Pro | 83.6% ↗ | not reported | — | — |
| OSWorld-Verified | 78.4% ↗ | not reported | — | — |
| SWE-Bench Pro (Public) | 55.1% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 79.3% ↗epoch | not reported | — | — |
| Terminal-bench 2.1 | 76.2% ↗ | not reported | — | — |
| Only GPT-5.6 Terra reports · 2 | ||||
| DeepSWE v1.1 | not reported | 69.6% ↗ | — | — |
| SWE-Bench Pro | not reported | 63.4% ↗ | — | — |
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 3.5 Flash minus GPT-5.6 Terra 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 3.5 Flash | GPT-5.6 Terra | Edge |
|---|---|---|---|
| Context window | 1.0M tokens | 1.1M tokens | GPT-5.6 Terra |
| Max output | 66K tokens | 128K tokens | GPT-5.6 Terra |
| Input price / 1M | $1.5 ↗ | $2 ↗ | Gemini 3.5 Flash |
| Output price / 1M | $9 ↗ | $12 ↗ | Gemini 3.5 Flash |
| Cached input / 1M | $0.15 ↗ | $0.2 ↗ | Gemini 3.5 Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $10.5 | $14 | Gemini 3.5 Flash |
| Modalities | text · vision · audio | text · vision | Gemini 3.5 Flash |
| Released | 2026-05-19 | 2026-07-09 | — |
| Cited benchmark scores | 15 | 8 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Gemini 3.5 Flash vs …
Models sharing the most benchmarksMore matchups
GPT-5.6 Terra vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Gemini 3.5 Flash and GPT-5.6 Terra on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.