Gemini 3.1 Flash-LitevsGemini 3.5 Flash-Lite
Gemini 3.1 Flash-Lite | Gemini 3.5 Flash-Lite | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $0.25 | $0.30 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $1.50 | $2.50 |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | $0.025 | $0.03 |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 11% | 65% |
| BenchmarksPublished by one model only | ||
SWE-Bench ProAgentic coding — Can the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | — | 54.2% |
Terminal-Bench 2.1Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 54% |
BU BenchBrowser agent — Can the AI drive a real web browser to finish tasks — clicking, filling forms, and navigating sites the way a person would? Run by Browser Use on their BU Bench task set. Higher is better. | — | 49% |
OSWorld-VerifiedAgentic computer use — Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | — | 74% |
GDPval-AA v2Knowledge work — economically valuable knowledge work (v2, re-based Elo) | — | 1140 |
| Overview | ||
| Company | ||
| Release date | Mar 3 2026 | Jul 21 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Frequently asked questions
Gemini 3.5 Flash-Lite leads Gemini 3.1 Flash-Lite on 1 of the 1 benchmark they both report (BullshitBench v2). Gemini 3.1 Flash-Lite is cheaper on both input and output: $0.25 vs $0.30 per million input tokens, and $1.50 vs $2.50 per million output tokens. Gemini 3.1 Flash-Lite shipped 140 days before Gemini 3.5 Flash-Lite, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, Gemini 3.5 Flash-Lite leads at 65% vs Gemini 3.1 Flash-Lite at 11%.
Gemini 3.1 Flash-Lite was released by Google on Mar 3 2026.
Gemini 3.5 Flash-Lite was released by Google on Jul 21 2026.
Gemini 3.1 Flash-Lite is cheaper on both input and output: $0.25 vs $0.30 per million input tokens, and $1.50 vs $2.50 per million output tokens. Rates are pay-as-you-go API prices verified on August 18, 2026.