Noometry

Model comparison

Gemini 3.1 Pro Preview vs Mercury 2

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 39.1 on the Noometry Index. Mercury 2 costs 12× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Last verified . 17 shared benchmarks.

Gemini 3.1 Pro Preview Google

56.7

Rank #23 Confirmed

Mercury 2 Inception

39.1

Rank #175 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 7 categories and Mercury 2 in 0 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 23.8.
  • The biggest single-benchmark swing is WeirdML: 72.1% for Gemini 3.1 Pro Preview and 43.2% for Mercury 2.
  • Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
  • Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 128K.

Side by side

Gemini 3.1 Pro PreviewMercury 2
ProviderGoogleInception
Noometry Index56.739.1
Released2026-02-192026-02-20
WeightsProprietaryProprietary
Context window1.05M128K
Max output66K50K
Input $ / M tokens$2$0.25
Output $ / M tokens$12$0.75
Results tracked7117

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Category by category

Coding Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 42.5 (#99), Mercury 2: 33.5 (#255)

BenchmarkGemini 3.1 Pro PreviewMercury 2
LMArena WebDev14471171
SciCode58.9%38.7%
WeirdML72.1%43.2%
LMArena Coding14841391
ALE-Bench1,161785.58
SWE-bench Verified75.6%—
DeepSWE11.7%—
GSO22.6%—
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Not comparable

Gemini 3.1 Pro Preview: 37.7 (#34), Mercury 2: —

BenchmarkGemini 3.1 Pro PreviewMercury 2
Terminal-Bench80.2%—
APEX-Agents35.3%—
τ²-bench Banking26%—
DeepResearch Bench47.8%—
PostTrainBench22%—
BALROG57%—
ExploitBench26.1%—
GBAEval0.8%—
GDP.pdf17%—
LMArena Search1211—
METR Time Horizons77%—
Vending-Bench 23,774—

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.7 (#12), Mercury 2: 23.8 (#170)

BenchmarkGemini 3.1 Pro PreviewMercury 2
CritPt17.7%0.8%
LMArena Hard Prompts14851362
ARC-AGI-277.1%—
SimpleBench79.6%—
NYT Connections (extended)97.4%—
ARC-AGI-198%—
Chess Puzzles55%—
EnigmaEval36.8%—
Thematic Generalization79.4%—
EBR-Bench14.3%—
Mystery Game Puzzles34%—
DTBench97.1%—
LMCA53.8%—
Epoch Capabilities Index154.77—
ForecastBench59—

Math Not comparable

Gemini 3.1 Pro Preview: 62.1 (#34), Mercury 2: —

BenchmarkGemini 3.1 Pro PreviewMercury 2
FrontierMath (Tiers 1-3)59.6%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions86.5%—
OTIS Mock AIME 2024-202595.6%—
ProofBench26%—
LMArena Math1485—
FrontierMath (Feb 2025 set)36.9%—
FrontierMath Tier 4 (v1)16.7%—

Knowledge Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.8 (#3), Mercury 2: 36.2 (#172)

BenchmarkGemini 3.1 Pro PreviewMercury 2
Vectara Hallucination Rate10.4%12.3%
LMArena Expert14851358
GPQA Diamond94.4%—
Humanity's Last Exam46.4%—
SimpleQA Verified73.5%—

Multimodal Not comparable

Gemini 3.1 Pro Preview: 37.9 (#69), Mercury 2: —

BenchmarkGemini 3.1 Pro PreviewMercury 2
LMArena Vision1296—
Blueprint-Bench 226.5%—
Furniture Assembly26.7%—
LMArena Document1444—

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 57.0 (#12), Mercury 2: 46.6 (#157)

BenchmarkGemini 3.1 Pro PreviewMercury 2
LMArena Non-English14771331
LMArena Chinese15291417
LMArena Russian14981304
LMArena French1487—
LMArena German1491—
LMArena Japanese1493—
LMArena Korean1455—
LMArena Spanish1479—

Instruction Following Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 77.0 (#32), Mercury 2: 70.2 (#165)

BenchmarkGemini 3.1 Pro PreviewMercury 2
LMArena Instruction Following14661329

Long Context Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 47.4 (#18), Mercury 2: 40.5 (#154)

BenchmarkGemini 3.1 Pro PreviewMercury 2
LMArena Longer Query14831330
CL-bench20.8%—
CL-bench Life16.9%—

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 66.1 (#37), Mercury 2: 53.8 (#155)

BenchmarkGemini 3.1 Pro PreviewMercury 2
LMArena Text14811355
LMArena Creative Writing14821289
LMArena Multi-Turn14881358
EQ-Bench Creative Writing1491—
EQ-Bench 41142—

Frequently asked questions

Is Gemini 3.1 Pro Preview better than Mercury 2?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 39.1 on the Noometry Index. Mercury 2 costs 12× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.1 Pro Preview or Mercury 2?

Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or Mercury 2 better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.5 versus 33.5 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 128K.

How many benchmarks do Gemini 3.1 Pro Preview and Mercury 2 share?

17 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Mercury 2 has 17.

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