# Claude Opus 4.8 vs Gemini 3 Flash Preview

> Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 8.9× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-opus-4-8-vs-gemini-3-flash-preview
- Last updated: 2026-10-10
- Shared benchmarks: 48

## Summary

- They share 48 benchmarks with published results for both. Claude Opus 4.8 scores higher in 8 categories and Gemini 3 Flash Preview in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 4.8 leads 78.2 to 51.4.
- The biggest single-benchmark swing is ProofBench: 69% for Claude Opus 4.8 and 15% for Gemini 3 Flash Preview.
- Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $5 / $25 for Claude Opus 4.8.
- Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| Provider | Anthropic | Google |
| Noometry Index | 60.7 | 52.3 |
| Rank | 9 | 33 |
| Context | 1M | 1.05M |
| Input $/M | $5 | $0.50 |
| Output $/M | $25 | $3 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4.8: 60.2 (#9)
- Gemini 3 Flash Preview: 51.5 (#35)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| LMArena WebDev | 1556 | 1439 |
| GSO | 47.1% | 9.8% |
| WeirdML | 82.9% | 61.6% |
| LMArena Coding | 1491 | 1460 |
| ALE-Bench | 1,564 | 1,367 |
| SWE-bench Verified | — | 75.4% |
| DeepSWE | 59% | — |
| FrontierCode | 46.5% | — |
| SWE-bench Verified (bash only) | — | 75.8% |
| SWE-bench Multilingual | — | 72.7% |
| SciCode | 53.5% | — |

## Agentic & Tool Use

- Claude Opus 4.8: 47.6 (#10)
- Gemini 3 Flash Preview: 38.6 (#27)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| τ²-bench Banking | 39.7% | 27.3% |
| DeepResearch Bench | 50.2% | 49.8% |
| GDP.pdf | 24% | 10% |
| LMArena Search | 1204 | 1198 |
| Vending-Bench 2 | 5,787 | 3,635 |
| Terminal-Bench | — | 64.3% |
| APEX-Agents | 48.9% | — |
| OSWorld 2.0 | 20.6% | — |
| Remote Labor Index | 8.3% | — |
| τ²-bench Airline | — | 82.5% |
| τ²-bench Retail | — | 76.8% |
| τ²-bench Telecom | — | 91.2% |
| PostTrainBench | 33.8% | — |
| BALROG | — | 48.1% |
| GBAEval | 70.9% | — |

## Reasoning

- Claude Opus 4.8: 64.6 (#14)
- Gemini 3 Flash Preview: 49.2 (#35)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| ARC-AGI-2 | 72.1% | 33.6% |
| SimpleBench | 64.8% | 61.1% |
| NYT Connections (extended) | 91.1% | 83.1% |
| ARC-AGI-1 | 92.5% | 84.7% |
| Chess Puzzles | 34% | 40% |
| LMArena Hard Prompts | 1481 | 1465 |
| Mystery Game Puzzles | 36% | 26% |
| DTBench | 94.9% | 89.1% |
| LMCA | 57.5% | 43.1% |
| Epoch Capabilities Index | 158.3 | 151.83 |
| ForecastBench | 59.9 | 58.5 |
| Kagi LLM Benchmark | 88.8% | — |
| CritPt | 20.9% | — |
| EnigmaEval | 23.5% | — |
| EBR-Bench | 28.6% | — |
| Surface Evolver Bench | 87.5% | — |
| Bench to the Future 3 | 0.14 | — |

## Math

- Claude Opus 4.8: 78.2 (#11)
- Gemini 3 Flash Preview: 51.4 (#42)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | 80% | 51.2% |
| FrontierMath Tier 4 | 56.1% | 17.1% |
| MathArena Final-Answer Competitions | 91.8% | 67.6% |
| OTIS Mock AIME 2024-2025 | 98.3% | 95.6% |
| ProofBench | 69% | 15% |
| LMArena Math | 1487 | 1472 |
| FrontierMath (Feb 2025 set) | 47.2% | 35.6% |
| FrontierMath Tier 4 (v1) | 31.3% | 4.2% |

## Knowledge

- Claude Opus 4.8: 61.3 (#26)
- Gemini 3 Flash Preview: 58.8 (#30)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| GPQA Diamond | 91% | 89.4% |
| SimpleQA Verified | 53% | 66.8% |
| LMArena Expert | 1501 | 1461 |
| Vectara Hallucination Rate | — | 13.5% |

## Multimodal

- Claude Opus 4.8: 43.2 (#20)
- Gemini 3 Flash Preview: 45.3 (#15)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Vision | 1295 | 1285 |
| Blueprint-Bench 2 | 14.5% | 0% |
| LMArena Document | 1475 | 1413 |
| GeoBench | — | 88% |
| VPCT | — | 72.6% |
| Furniture Assembly | 42.5% | — |

## Multilingual

- Claude Opus 4.8: 55.4 (#31)
- Gemini 3 Flash Preview: 55.9 (#26)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Non-English | 1450 | 1458 |
| LMArena Chinese | 1509 | 1510 |
| LMArena French | 1482 | 1478 |
| LMArena German | 1470 | 1497 |
| LMArena Japanese | 1440 | 1488 |
| LMArena Korean | 1432 | 1443 |
| LMArena Russian | 1476 | 1480 |
| LMArena Spanish | 1470 | 1470 |

## Instruction Following

- Claude Opus 4.8: 77.6 (#22)
- Gemini 3 Flash Preview: 75.8 (#52)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Instruction Following | 1476 | 1437 |

## Long Context

- Claude Opus 4.8: 45.4 (#37)
- Gemini 3 Flash Preview: 44.4 (#63)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Longer Query | 1482 | 1452 |

## Writing & Preference

- Claude Opus 4.8: 72.1 (#17)
- Gemini 3 Flash Preview: 65.6 (#44)

| Benchmark | Claude Opus 4.8 | Gemini 3 Flash Preview |
|---|---|---|
| LMArena Text | 1460 | 1466 |
| LMArena Creative Writing | 1453 | 1457 |
| LMArena Multi-Turn | 1476 | 1471 |
| EQ-Bench Creative Writing | 1840 | — |
| EQ-Bench 4 | 1281 | — |

## FAQ

### Is Claude Opus 4.8 better than Gemini 3 Flash Preview?

Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 8.9× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.

### Which is cheaper, Claude Opus 4.8 or Gemini 3 Flash Preview?

Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Claude Opus 4.8 lists at $5 and $25.

### Is Claude Opus 4.8 or Gemini 3 Flash Preview better for coding?

Claude Opus 4.8 scores higher on coding benchmarks: 60.2 versus 51.5 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 1M.

### How many benchmarks do Claude Opus 4.8 and Gemini 3 Flash Preview share?

48 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and Gemini 3 Flash Preview has 59.