Model comparison
Claude Opus 4 vs Gemini 3.8 Flash
Gemini 3.8 Flash is the stronger model overall, scoring 59.5 to 42.9 on the Noometry Index.
Last verified . 26 shared benchmarks.
GoogleSummary
- They share 26 benchmarks with published results for both. Claude Opus 4 scores higher in 0 categories and Gemini 3.8 Flash in 10 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.8 Flash leads 64.7 to 27.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 64.4% for Claude Opus 4 and 98.9% for Gemini 3.8 Flash.
- Gemini 3.8 Flash is cheaper at $0.75 / $3.75 per million input/output tokens, against $15 / $75 for Claude Opus 4.
- Gemini 3.8 Flash accepts more context: 1.05M tokens versus 200K.
Side by side
| Claude Opus 4 | Gemini 3.8 Flash | |
|---|---|---|
| Provider | Anthropic | |
| Noometry Index | 42.9 | 59.5 |
| Released | 2025-05-22 | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 1.05M |
| Max output | 32K | 66K |
| Input $ / M tokens | $15 | $0.75 |
| Output $ / M tokens | $75 | $3.75 |
| Results tracked | 56 | 46 |
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Category by category
Coding Gemini 3.8 Flash leads
Claude Opus 4: 47.8 (#55), Gemini 3.8 Flash: 56.4 (#17)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Coding | 1442 | 1512 |
| SWE-bench Verified | 70.7% | — |
| DeepSWE | — | 73.8% |
| FrontierCode | — | 41.2% |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| CursorBench | — | 39.6% |
| LMArena WebDev | — | 1581 |
| FrontierSWE | — | 19.6% |
| SciCode | — | 56.6% |
| GSO | 6.9% | — |
| WeirdML | 43.7% | — |
| ALE-Bench | — | 1,270 |
| AlgoTune | 1.33 | — |
Agentic & Tool Use Gemini 3.8 Flash leads
Claude Opus 4: 34.5 (#39), Gemini 3.8 Flash: 40.3 (#22)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| APEX-Agents | — | 64.3% |
| Cybench | 38% | — |
| DeepResearch Bench | 46.8% | — |
| GDP.pdf | — | 23.4% |
| LMArena Search | 1127 | — |
| METR Time Horizons | 63.9% | — |
| Vending-Bench 2 | — | 5,094 |
Reasoning Gemini 3.8 Flash leads
Claude Opus 4: 27.4 (#104), Gemini 3.8 Flash: 64.7 (#13)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| CritPt | 0.3% | 18.3% |
| LMArena Hard Prompts | 1399 | 1506 |
| DTBench | 81.6% | 95.7% |
| LMCA | 37.4% | 52.9% |
| Epoch Capabilities Index | 142.67 | 157.13 |
| ARC-AGI-2 | 8.6% | — |
| SimpleBench | 58.8% | — |
| Kagi LLM Benchmark | 74.3% | — |
| NYT Connections (extended) | — | 97.4% |
| ARC-AGI-1 | 35.7% | — |
| Chess Puzzles | — | 61% |
| EnigmaEval | 5.6% | — |
| Mystery Game Puzzles | — | 47% |
| Surface Evolver Bench | — | 76.9% |
| ForecastBench | 61.1 | — |
Math Gemini 3.8 Flash leads
Claude Opus 4: 40.2 (#80), Gemini 3.8 Flash: 65.2 (#22)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 64.4% | 98.9% |
| LMArena Math | 1391 | 1528 |
| FrontierMath (Tiers 1-3) | — | 68.4% |
| FrontierMath Tier 4 | — | 22% |
| ProofBench | — | 48% |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Gemini 3.8 Flash leads
Claude Opus 4: 43.9 (#82), Gemini 3.8 Flash: 74.9 (#2)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| GPQA Diamond | 76.3% | 95.4% |
| Humanity's Last Exam | 10.7% | 44.5% |
| LMArena Expert | 1384 | 1529 |
| SimpleQA Verified | — | 69.7% |
| MMLU-Pro | 87.5% | — |
| Confabulations | 15.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |
Multimodal Gemini 3.8 Flash leads
Claude Opus 4: 30.9 (#101), Gemini 3.8 Flash: 40.9 (#33)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Vision | 1192 | 1312 |
| GeoBench | 49% | — |
| VPCT | 38% | — |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 31.7% |
Multilingual Gemini 3.8 Flash leads
Claude Opus 4: 49.0 (#133), Gemini 3.8 Flash: 57.9 (#5)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Non-English | 1362 | 1486 |
| LMArena Chinese | 1386 | 1547 |
| LMArena French | 1370 | 1502 |
| LMArena German | 1391 | 1470 |
| LMArena Japanese | 1332 | 1505 |
| LMArena Korean | 1318 | 1479 |
| LMArena Russian | 1392 | 1507 |
| LMArena Spanish | 1388 | 1492 |
Instruction Following Too close to call
Claude Opus 4: 77.3 (#26), Gemini 3.8 Flash: 78.2 (#11)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Instruction Following | 1406 | 1489 |
| IFEval | 91.8% | — |
Long Context Gemini 3.8 Flash leads
Claude Opus 4: 39.5 (#167), Gemini 3.8 Flash: 46.2 (#23)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Longer Query | 1422 | 1506 |
| Fiction.LiveBench | 61.1% | — |
Writing & Preference Gemini 3.8 Flash leads
Claude Opus 4: 61.4 (#85), Gemini 3.8 Flash: 72.1 (#16)
| Benchmark | Claude Opus 4 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Text | 1377 | 1494 |
| LMArena Creative Writing | 1386 | 1485 |
| EQ-Bench Creative Writing | 1580 | 1748 |
| LMArena Multi-Turn | 1396 | 1503 |
| Short-Story Creative Writing | 83.6% | — |
| WildBench | 85.2% | — |
Frequently asked questions
Is Claude Opus 4 better than Gemini 3.8 Flash?
Gemini 3.8 Flash is the stronger model overall, scoring 59.5 to 42.9 on the Noometry Index.
Which is cheaper, Claude Opus 4 or Gemini 3.8 Flash?
Gemini 3.8 Flash is cheaper. It lists at $0.75 per million input tokens and $3.75 per million output tokens; Claude Opus 4 lists at $15 and $75.
Is Claude Opus 4 or Gemini 3.8 Flash better for coding?
Gemini 3.8 Flash scores higher on coding benchmarks: 56.4 versus 47.8 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.8 Flash does, with 1.05M tokens against 200K.
How many benchmarks do Claude Opus 4 and Gemini 3.8 Flash share?
26 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Gemini 3.8 Flash has 46.