Compare / head-to-head
Gemini 3.5 Flash-LitevsGPT-5.1
GPT-5.1 leads 2 of 3 shared benchmarks. Gemini 3.5 Flash-Lite is 4x cheaper per token. Gemini 3.5 Flash-Lite has the larger context window (1.0M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 2
GPT-5.1 leads
Cheaper per token
Gemini 3.5 Flash-Lite
4x cheaper, input + output
Larger context
Gemini 3.5 Flash-Lite
1.0M tokens
Provider uptime (30d)
100% · 94.2446%
Google · OpenAI
Gemini 3.5 Flash-Lite
Google · released 2026-07-21
textvisionaudio
Quality
Benchmark matrix
3 shared · 2 only Gemini 3.5 Flash-Lite · 3 only GPT-5.1| Benchmark | Gemini 3.5 Flash-Lite | GPT-5.1 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| GPQA Diamond | 83.3% ↗epoch | 87.6% ↗epoch | -4.3 pt | GPT-5.1 |
| LMArena Elo | 1435.5 ↗ | 1422.6 ↗ | +12.9 | Gemini 3.5 Flash-Lite |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 71.1% ↗epoch | 88.6% ↗epoch | -17.5 pt | GPT-5.1 |
| Only Gemini 3.5 Flash-Lite reports · 2 | ||||
| FrontierMath Tier 4 v2 (Epoch AI run) | 0% ↗epoch | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 26% ↗epoch | not reported | — | — |
| Only GPT-5.1 reports · 3 | ||||
| AIME 2025 | not reported | 94.2% ↗matharena ⚠ | — | — |
| SimpleQA Verified | not reported | 48% ↗epoch | — | — |
| SWE-bench Verified (Epoch AI run) | not reported | 68% ↗epoch | — | — |
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-Lite minus GPT-5.1 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-Lite | GPT-5.1 | Edge |
|---|---|---|---|
| Context window | 1.0M tokens | 400K tokens | Gemini 3.5 Flash-Lite |
| Max output | 66K tokens | 128K tokens | GPT-5.1 |
| Input price / 1M | $0.3 ↗ | $1.25 ↗ | Gemini 3.5 Flash-Lite |
| Output price / 1M | $2.5 ↗ | $10 ↗ | Gemini 3.5 Flash-Lite |
| Cached input / 1M | $0.03 ↗ | $0.125 ↗ | Gemini 3.5 Flash-Lite |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $2.8 | $11.25 | Gemini 3.5 Flash-Lite |
| Modalities | text · vision · audio | text · vision | Gemini 3.5 Flash-Lite |
| Released | 2026-07-21 | 2025-11-13 | — |
| Cited benchmark scores | 5 | 6 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Gemini 3.5 Flash-Lite vs …
Models sharing the most benchmarksMore matchups
GPT-5.1 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-Lite and GPT-5.1 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.