Which is better, Gemini 3.1 Pro or Gemini 3 Flash Preview?

Across 54 shared benchmarks tracked on Vector Wire, Gemini 3.1 Pro leads on 47 and Gemini 3 Flash Preview leads on 5 — Gemini 3.1 Pro leads on more. Strengths differ by axis; the table below shows every head-to-head number with provenance.

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Gemini 3.1 Pro vs Gemini 3 Flash Preview

GooglevsGoogle54 shared benchmarks47–5 head-to-head

Benchmark	Gemini 3.1 Pro	Gemini 3 Flash Preview
AA Agentic Index	23	49.7
AA Intelligence	47.7	38.7
AA-LCR	79	73
AA-Omniscience	32.9	10.1
aime_2026	98.3	96.7
apexAgents	33.5	27.7
arc_agi_1	98	84.7
ARC-AGI-2	77.1	33.6
arena_elo	1486	1473
arena_text_factuality	1471	1452
arena_vision	1280	1260
Artificial Analysis Coding Index	68.8	42.6
Blueprint-Bench 2	26.5	0
charxiv_rq	89.9	80.3
coding_arena_elo	1447	1387
critpt	17.7	8.6
Finance Agent v2	43	42.6
frontiermath_tier_4	16.7	4.2
gdpval	23.3	35.2
GDPval-AA (Elo)	1317	1204
GPQA Diamond	94.3	90.4
HLE	51.4	43.5
hmmt_feb_2026	94.7	89.4
hmmt_nov_2025	94.8	93.3
Humanity’s Last Exam	44.4	33.7
IFBench	77.1	78
Legal Agent Benchmark	0	0
livebench	79.9	72.4
matharena_visual_math_overall	89.4	85.8
MCP Atlas	78.2	62
mmmlu	92.6	91.8
MMMU-Pro	83	81.2
mrcr_v2_8needle_128k_average	84.9	67.2
mrcr_v2_8needle_1m_pointwise	26.3	26.3
OmniScience Accuracy	55.3	53.4
OmniScience Non-Hallucination	50.1	7.6
OSWorld-Verified	76.2	65.1
scicode	59	50.6
simplebench	79.6	61.1
simpleqa_verified	77.3	67.4
SWE-bench Multilingual	76.9	72.7
SWE-bench Pro	54.2	49.6
SWE-bench Verified	80.6	78
TauBench V3 - Banking	21.4	20.8
Terminal-Bench 2.0	68.5	47.6
Terminal-Bench 2.1	74	58
Terminal-Bench Hard	68.5	38.6
toolathlon	48.8	49.4
vectara_answer_rate	99.4	99.8
vectara_avg_summary_length	107.7	90.2
vectara_factual_consistency	89.6	86.5
vectara_hallucination_rate ↓	10.4	13.5
τ²-Bench Telecom (AA run)	99.3	80.4
τ³-Bench	67.1	17.5

Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. Open either model for its full surface, provenance and pricing.