# Gemini 2.0 Flash-Lite vs GPT-5.1-Codex

> Gemini 2.0 Flash-Lite and GPT-5.1-Codex score almost the same on the Noometry Index (37.3 vs 38.2), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gemini-2-0-flash-lite-vs-gpt-5-1-codex
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.1-Codex leads 41.7 to 37.4.

## Snapshot

| | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| Provider | Google | OpenAI |
| Noometry Index | 37.3 | 38.2 |
| Rank | 189 | 178 |
| Context | — | 400K |
| Input $/M | — | $1.25 |
| Output $/M | — | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 2.0 Flash-Lite: 37.4 (#181)
- GPT-5.1-Codex: 41.7 (#107)

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| SWE-bench Verified (bash only) | — | 66% |
| LMArena WebDev | — | 1337 |
| LiveBench Coding | 47.1% | — |
| LMArena Coding | 1322 | — |
| ALE-Bench | — | 1,245 |

## Agentic & Tool Use

- Gemini 2.0 Flash-Lite: —
- GPT-5.1-Codex: 37.8 (#32)

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| Terminal-Bench | — | 60.4% |
| METR Time Horizons | — | 70.8% |

## Reasoning

- Gemini 2.0 Flash-Lite: 21.2 (#203)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| LiveBench Reasoning | 50.1% | — |
| LMArena Hard Prompts | 1324 | — |
| DTBench | 52.5% | — |
| LiveBench Data Analysis | 65.5% | — |
| ForecastBench | 57.1 | — |
| LiveBench | 54.3% | — |

## Math

- Gemini 2.0 Flash-Lite: 31.8 (#192)
- GPT-5.1-Codex: 29.3 (#218)

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| ProofBench | — | 9% |
| Omni-MATH | 37.4% | — |
| LiveBench Math | 58.1% | — |
| LMArena Math | 1309 | — |

## Knowledge

- Gemini 2.0 Flash-Lite: 34.6 (#185)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| MMLU-Pro | 72% | — |
| GPQA (HELM) | 50% | — |
| LMArena Expert | 1305 | — |

## Multimodal

- Gemini 2.0 Flash-Lite: 30.6 (#103)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| LMArena Vision | 1100 | — |

## Multilingual

- Gemini 2.0 Flash-Lite: 46.2 (#156)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| LMArena Non-English | 1323 | — |
| LMArena Chinese | 1339 | — |
| LMArena French | 1346 | — |
| LMArena German | 1306 | — |
| LMArena Japanese | 1302 | — |
| LMArena Korean | 1325 | — |
| LMArena Russian | 1328 | — |
| LMArena Spanish | 1313 | — |

## Instruction Following

- Gemini 2.0 Flash-Lite: 70.6 (#158)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| LiveBench Instruction Following | 78.3% | — |
| IFEval | 82.4% | — |
| LMArena Instruction Following | 1305 | — |

## Long Context

- Gemini 2.0 Flash-Lite: 40.1 (#155)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| LMArena Longer Query | 1321 | — |

## Writing & Preference

- Gemini 2.0 Flash-Lite: 51.9 (#172)
- GPT-5.1-Codex: —

| Benchmark | Gemini 2.0 Flash-Lite | GPT-5.1-Codex |
|---|---|---|
| LMArena Text | 1330 | — |
| LMArena Creative Writing | 1319 | — |
| WildBench | 79% | — |
| LMArena Multi-Turn | 1307 | — |
| LiveBench Language | 34.3% | — |

## FAQ

### Is Gemini 2.0 Flash-Lite better than GPT-5.1-Codex?

Gemini 2.0 Flash-Lite and GPT-5.1-Codex score almost the same on the Noometry Index (37.3 vs 38.2), so choose on price, context window or the category you care about most.

### Is Gemini 2.0 Flash-Lite or GPT-5.1-Codex better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 37.4 in the Noometry coding category.

### How many benchmarks do Gemini 2.0 Flash-Lite and GPT-5.1-Codex share?

0 benchmarks have published results for both models. Gemini 2.0 Flash-Lite has 32 scored results on Noometry and GPT-5.1-Codex has 6.