Model comparison
Gemini 2.5 Flash-Lite vs Mercury 2.5
Gemini 2.5 Flash-Lite is the stronger model overall, scoring 37.0 to 33.5 on the Noometry Index. Mercury 2.5 costs 2.6× less per token, which makes it the better buy when Gemini 2.5 Flash-Lite's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
GoogleSummary
- They share 1 benchmark with published results for both. Gemini 2.5 Flash-Lite scores higher in 1 category and Mercury 2.5 in 2 categories; one gap is clear of the uncertainty.
- The widest gap is in math, where Gemini 2.5 Flash-Lite leads 38.0 to 23.3.
- 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.
Side by side
| Gemini 2.5 Flash-Lite | Mercury 2.5 | |
|---|---|---|
| Provider | Inception | |
| Noometry Index | 37.0 | 33.5 |
| Released | 2025-06-17 | 2026-09-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 260K |
| Max output | 66K | 66K |
| Input $ / M tokens | $0.10 | $0.04 |
| Output $ / M tokens | $0.40 | $0.15 |
| Results tracked | 33 | 4 |
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Category by category
Coding Too close to call
Gemini 2.5 Flash-Lite: 38.5 (#173), Mercury 2.5: 39.5 (#156)
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| ALE-Bench | 325.9 | 301.65 |
| SciCode | — | 38.5% |
| WeirdML | 35.2% | — |
| LMArena Coding | 1373 | — |
Agentic & Tool Use Not comparable
Gemini 2.5 Flash-Lite: 28.0 (#96), Mercury 2.5: —
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 36.9% | — |
Reasoning Too close to call
Gemini 2.5 Flash-Lite: 22.2 (#205), Mercury 2.5: 22.4 (#193)
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Kagi LLM Benchmark | 40.5% | — |
| CritPt | — | 0% |
| LMArena Hard Prompts | 1377 | — |
| DTBench | 62.8% | — |
| LMCA | 18.1% | — |
| Epoch Capabilities Index | 133.94 | — |
Math Gemini 2.5 Flash-Lite leads
Gemini 2.5 Flash-Lite: 38.0 (#144), Mercury 2.5: 23.3 (#272)
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| ProofBench | — | 3% |
| Omni-MATH | 48% | — |
| LMArena Math | 1373 | — |
Knowledge Not comparable
Gemini 2.5 Flash-Lite: 32.5 (#210), 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 Not comparable
Gemini 2.5 Flash-Lite: 29.1 (#114), Mercury 2.5: —
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| LMArena Vision | 1198 | — |
| VPCT | 30% | — |
Multilingual Not comparable
Gemini 2.5 Flash-Lite: 49.3 (#134), Mercury 2.5: —
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| LMArena Non-English | 1369 | — |
| LMArena Chinese | 1404 | — |
| LMArena French | 1388 | — |
| LMArena German | 1389 | — |
| LMArena Japanese | 1359 | — |
| LMArena Korean | 1360 | — |
| LMArena Russian | 1373 | — |
| LMArena Spanish | 1396 | — |
Instruction Following Not comparable
Gemini 2.5 Flash-Lite: 70.0 (#168), Mercury 2.5: —
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| IFEval | 81% | — |
| LMArena Instruction Following | 1367 | — |
Long Context Not comparable
Gemini 2.5 Flash-Lite: 33.3 (#262), Mercury 2.5: —
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| Fiction.LiveBench | 47.2% | — |
| LMArena Longer Query | 1373 | — |
Writing & Preference Not comparable
Gemini 2.5 Flash-Lite: 56.8 (#135), Mercury 2.5: —
| Benchmark | Gemini 2.5 Flash-Lite | Mercury 2.5 |
|---|---|---|
| LMArena Text | 1379 | — |
| LMArena Creative Writing | 1367 | — |
| WildBench | 81.8% | — |
| LMArena Multi-Turn | 1366 | — |
Frequently asked questions
Is Gemini 2.5 Flash-Lite better than Mercury 2.5?
Gemini 2.5 Flash-Lite is the stronger model overall, scoring 37.0 to 33.5 on the Noometry Index. Mercury 2.5 costs 2.6× less per token, which makes it the better buy when Gemini 2.5 Flash-Lite's lead doesn't matter for your workload.
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.
Is Gemini 2.5 Flash-Lite or Mercury 2.5 better for coding?
They score almost the same on coding (38.5 vs 39.5); test both on your own repository before choosing.
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 4.