GoogleUnited States· released Mar 2026

Gemini 3.1 Flash-Lite

Name: Gemini 3.1 Flash-Lite
Author: Google

Provisional: 12 comparable tests so far. Ranked once it reaches 6 across 3 counting categories.

Google, United States. One of 14 models from this lab on the Index.

Third-party publishedLow confidence (thin coverage)

Available in Theo as Theo Swift

Theo orchestrates it for the steps it does best and always shows which engine answered.

Use it in Theo

Snapshot September 8, 2026

OpenCharts Index

34.1

Provisional: not enough comparable tests or counting categories to rank yet · 12 comparable tests · 1 counting categories

Drop any single test and the Index lands between 34.1 and 58.8.

Needs more results (2 of 8 so far)

Averaging 24.1 on the 2 it has; the score opens at 4 of 8.

Distance to today's frontier on the hardest tests. Not a measure of intelligence.

What it's known for

Gemini 3.1 Flash-Lite, in 12 results.

Strongest in reasoning (34.1). Its widest gap is on CritPt, 96.5% behind the best published result. No comparable results yet in knowledge and long context. Below 40% of the best published results, on average.

Strongest category

Reasoning

Hard, novel problems: graduate science, abstract puzzles, expert exams.

34.1

GPQA Diamond81.8% · 80% of best
Humanity's Last Exam8.6% · 19% of best
CritPt1.1% · 4% of best

Mean of 3 of the category's 6 comparable tests. Counts toward the Index.

Best single result

GPQA Diamond

Answer a PhD-level multiple-choice question in physics, chemistry or biology that a web search will not settle.

81.8%

80.3% of the best (95.8%), above chance · #67 of 78.

Expert-level science questions are the closest thing to asking a specialist colleague. A model that gets them right can check a technical claim instead of echoing it.

Where it trails

CritPt

Solve an unpublished research-level physics problem to a numeric or symbolic answer checked by an official server.

1.1%

96.5% behind the best published result (32.3%) · #61 of 78.

Research physics is far past textbook recall. Only a few models produce anything a physicist would accept.

Not measured yet

No comparable result yet in these 2 categories. A blank is a blank, never a zero, and it does not lower the Index.

Knowledge
Long context

Covered, but not averaged into the Index:

Coding3 of 7 tests · needs 4 · mean 44.0
Math2 of 5 tests · needs 3 · mean 54.8
Agentic2 of 8 tests · needs 4 · mean 47.5
Multimodalsingle-test category, shown beside the Index · 77.9
Human preferencesingle-test category, shown beside the Index · 78.8

Every score, with its source

See it at work

What Gemini 3.1 Flash-Lite was asked to do, and how it did.

Every test it has taken, by category, with the kind of task it faced, who produced the number and where the result landed against the best published one. The examples are original and illustrative, never items from the datasets themselves.

Human preference · mean 78.8 across 1 comparable test · a single-test category, shown beside the Index and never averaged into it

Text ArenaLeaderboard

Answer the same prompt as a rival model; real users vote blind on which answer they prefer.

1,432

39% expected win rate against the board leader (1,507)
#66 of 92

preview · board 2026-09-02

Source: Arena

Every result is read against the best published one on its test: percent scores as a share of the best above chance, Arena ratings as the expected win rate against the board leader, open-ended values on a log scale. Sitting a harder exam never lowers a model. Every number links to the publisher that produced it.

Head to head

Gemini 3.1 Flash-Lite against whoever you pick.

Choose a rival. Every counted test both have taken appears side by side as a share of the best published result on that test, with the category means above. A win is a higher share; a gap under 2 points is a tie, because one item on a 45-problem exam is 2.2 points and publishers' own standard errors are of that order.

Gemini 3.1 Flash-Lite

provisional·Index 34.1F

0 : 8

wins · 0 ties · 8 shared

GPT-6 Astra

#1·Index 99.0A+

GPT-6 Astra comes out ahead on 8 of the 8 tests both have taken.

Category means

Reasoning
34.1
99.6
Knowledge
—
100.0
Coding
44.0
97.7
Math
54.8
99.8
Agentic
47.5
98.5
Multimodal
77.9
—
Human preference
78.8
—

Shared tests · biggest gaps first

CritPtReasoning
1.1%
31.7%
−94.7
Code Arena (WebDev)Coding
1,254
1,797
−91.6
APEX-AgentsAgentic
13.0%
46.7%
−71.1
FrontierMath (Tiers 1–3)Math
27.7%
93.7%
−70.4
WeirdMLCoding
52.2%
92.9%
−43.8
SciCodeCoding
41.9%
56.5%
−23.5
Mock AIME 2024–2025Math
80.0%
100.0%
−20.0
GPQA DiamondReasoning
81.8%
95.8%
−19.7

Bars are distances to the best published result on each test (percent scores above chance, Arena ratings as win rate against the leader, open-ended values on a log scale). Raw values as the publishers report them.

Open GPT-6 Astra

Scores

Every test, every source

The best published run per benchmark, the raw value as the publisher reports it, who produced the number, how close it comes to the best published result on that test, and where the model sits among every model scored on it. Percent scores are read above chance, Arena ratings as a win rate against the board leader, open-ended values on a log scale. A test with too few models to compare against is shown but not counted.

Category means

Reasoning34.1 · 3/6
Knowledge—
Coding44.0 · 3/7
Math54.8 · 2/5
Agentic47.5 · 2/8
Multimodalbeside77.9 · 1/1
Human preferencebeside78.8 · 1/1
Long context—

Mean · tests taken of the category's comparable tests. A faded category either rests on fewer than half of them or is a single-test category (marked “beside”), which is shown next to the Index and never averaged into it.

GPQA DiamondEpoch-runReasoning

81.8%

80.3% of the best (95.8%), above chance
14th percentile of 78 · n = 198

high

Source: Epoch AI — AI Benchmarking Hub

Humanity's Last ExamLeaderboardReasoning

8.6%

18.6% of the best (46.5%)
0th percentile of 18 · n = 2,500

Source: Epoch AI — AI Benchmarking Hub

CritPtLeaderboardReasoning

1.1%

3.5% of the best (32.3%)
18th percentile of 78