# Gemini 2.5 Flash-Lite vs Mercury 2.5

> Gemini 2.5 Flash-Lite has enough public results to be ranked (#208); Mercury 2.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/gemini-2-5-flash-lite-vs-mercury-2-5
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Gemini 2.5 Flash-Lite scores higher in 1 category and Mercury 2.5 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in math, where Gemini 2.5 Flash-Lite leads 35.5 to 22.4.
- Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $0.10 / $0.40 for Gemini 2.5 Flash-Lite.
- Gemini 2.5 Flash-Lite accepts more context: 1.05M tokens versus 260K.

## Snapshot

| | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Provider | Google | Inception |
| Noometry Index | 36.4 | 30.2 |
| Rank | 208 | — |
| Context | 1.05M | 260K |
| Input $/M | $0.10 | $0.04 |
| Output $/M | $0.40 | $0.15 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.5 Flash-Lite: 38.0 (#167)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| ALE-Bench | 325.9 | 301.65 |
| WeirdML | 35.2% | — |
| LMArena Coding | 1373 | — |

## Agentic & Tool Use

- Gemini 2.5 Flash-Lite: 27.8 (#89)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 36.9% | — |

## Reasoning

- Gemini 2.5 Flash-Lite: 21.5 (#196)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Kagi LLM Benchmark | 40.5% | — |
| LMArena Hard Prompts | 1377 | — |
| DTBench | 62.8% | — |
| LMCA | 18.1% | — |
| Epoch Capabilities Index | 133.93 | — |

## Math

- Gemini 2.5 Flash-Lite: 35.5 (#144)
- Mercury 2.5: 22.4

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |
| Omni-MATH | 48% | — |
| LMArena Math | 1373 | — |

## Knowledge

- Gemini 2.5 Flash-Lite: 32.1 (#206)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| MMLU-Pro | 53.7% | — |
| Vectara Hallucination Rate | 3.3% | — |
| GPQA (HELM) | 30.9% | — |
| LMArena Expert | 1373 | — |

## Multimodal

- Gemini 2.5 Flash-Lite: 28.6 (#109)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1198 | — |
| VPCT | 30% | — |

## Multilingual

- Gemini 2.5 Flash-Lite: 49.5 (#129)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1369 | — |
| LMArena Chinese | 1404 | — |
| LMArena French | 1388 | — |
| LMArena German | 1390 | — |
| LMArena Japanese | 1359 | — |
| LMArena Korean | 1358 | — |
| LMArena Russian | 1373 | — |
| LMArena Spanish | 1396 | — |

## Instruction Following

- Gemini 2.5 Flash-Lite: 70.2 (#163)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| IFEval | 81% | — |
| LMArena Instruction Following | 1366 | — |

## Long Context

- Gemini 2.5 Flash-Lite: 33.3 (#257)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Fiction.LiveBench | 47.2% | — |
| LMArena Longer Query | 1373 | — |

## Writing & Preference

- Gemini 2.5 Flash-Lite: 57.0 (#130)
- Mercury 2.5: —

| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1379 | — |
| LMArena Creative Writing | 1366 | — |
| WildBench | 81.8% | — |
| LMArena Multi-Turn | 1367 | — |

## FAQ

### Is Gemini 2.5 Flash-Lite better than Mercury 2.5?

Gemini 2.5 Flash-Lite has enough public results to be ranked (#208); Mercury 2.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Gemini 2.5 Flash-Lite or Mercury 2.5?

Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Gemini 2.5 Flash-Lite lists at $0.10 and $0.40.

### Which has the bigger context window?

Gemini 2.5 Flash-Lite does, with 1.05M tokens against 260K.

### How many benchmarks do Gemini 2.5 Flash-Lite and Mercury 2.5 share?

1 benchmark has published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and Mercury 2.5 has 2.