Claude Opus 4.5 vs Gemini 3.1 Flash Lite Preview
Updated October 21, 2026. 55 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Claude Opus 4.5 for coding: it scores 66.8 on the Vibe Coding Index against 8.1 for Gemini 3.1 Flash Lite Preview.
Pick Gemini 3.1 Flash Lite Preview when output tokens cost 16.7x less, or when a solved task costs $0.18 against $1.37.
- Shared results
- 55
- Claude Opus 4.5 only
- 50
- Gemini 3.1 Flash Lite Preview only
- 22
- Like-for-like categories
- 7 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, four public coding benchmarks
Claude Opus 4.5
Claude Opus 4.5 scores 66.8 against 8.1.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 4.5
Claude Opus 4.5 leads, 29.1 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Agentic Index result, 1.6.
Directional only
Reasoning
GPQA Diamond
Claude Opus 4.5
Claude Opus 4.5 leads, 85.9% against 81.1%.
Same board, both measured
Math
AIME
Claude Opus 4.5
Claude Opus 4.5 leads, 95.4% against 83.3%.
Same board, both measured
Knowledge
MMLU Pro
Claude Opus 4.5
Claude Opus 4.5 leads, 87.3% against 86.2%.
Same board, both measured
Web design
Design Arena: websites
Claude Opus 4.5
Claude Opus 4.5 leads, 1247 against 1083.
Same board, both measured
Long documents
Listed context window
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Claude Opus 4.5 $0.018, Gemini 3.1 Flash Lite Preview $0.0010 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.1 Flash Lite Preview
Claude Opus 4.5 $1.37, Gemini 3.1 Flash Lite Preview $0.18.
Published attempt cost and pass rate
At a glance
- Coding index
- Claude Opus 4.5 66.8 from 2 benchmarks, Gemini 3.1 Flash Lite Preview 8.1 from 1 benchmark.
- Widest category
- Coding, 22.3 points apart on average over 8 shared benchmarks.
- Widest single gap
- LMArena WebDev: HTML: Claude Opus 4.5 1510 against Gemini 3.1 Flash Lite Preview 1276, 39.0 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.5 $25.00 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 16.7x apart.
- Context window
- Claude Opus 4.5 takes 200K tokens, Gemini 3.1 Flash Lite Preview 1.05M.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Claude Opus 4.5 | Bars | Gemini 3.1 Flash Lite Preview | Ties |
|---|---|---|---|---|
| Coding | 8 | 0 | ||
| Intelligence | 1 | 0 | ||
| Reasoning | 5 | 0 | ||
| Math | 3 | 0 | ||
| Knowledge | 11 | 0 | ||
| Web design | 8 | 0 | ||
| General | 18 | 1 | ||
| All shared boards | 54 | 1 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index80
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| SWE-bench Verified | 79.2% | Not measured | Only Claude Opus 4.5 measured |
| SWE-bench (full test set) | 52.6% | Not measured | Only Claude Opus 4.5 measured |
| SWE-bench Multilingual | 70.7% | Not measured | Only Claude Opus 4.5 measured |
| LMArena WebDev | 1494 | 1257 | Claude Opus 4.5 |
| AA Coding Index | Not measured | 34.7 | Only Gemini 3.1 Flash Lite Preview measured |
| LiveCodeBench (Vals AI) | 83.7% | 80.1% | Claude Opus 4.5 |
| SWE-bench Verified (Vals AI) | 76.4% | 62.8% | Claude Opus 4.5 |
| Vibe Code Bench (Vals AI) | 20.6% | 0.0% | Claude Opus 4.5 |
| Code migration (Vals AI) | Not measured | 4.6% | Only Gemini 3.1 Flash Lite Preview measured |
| ProgramBench (Vals AI) | Not measured | 0.0% | Only Gemini 3.1 Flash Lite Preview measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 34.1% | Only Gemini 3.1 Flash Lite Preview measured |
| LiveCodeBench (Artificial Analysis run) | 87.1% | Not measured | Only Claude Opus 4.5 measured |
| Terminal-Bench Hard (Artificial Analysis run) | 47.0% | Not measured | Only Claude Opus 4.5 measured |
| Terminal-Bench | 63.1% | Not measured | Only Claude Opus 4.5 measured |
| GSO-Bench | 26.5% | Not measured | Only Claude Opus 4.5 measured |
| WeirdML | 63.7% | Not measured | Only Claude Opus 4.5 measured |
| Cybench | 82.0% | Not measured | Only Claude Opus 4.5 measured |
| ALE-Bench | Not measured | 797.7 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: coding | 1503 | 1400 | Claude Opus 4.5 |
| LMArena Text: software and IT | 1483 | 1413 | Claude Opus 4.5 |
| LMArena WebDev: React | 1478 | 1245 | Claude Opus 4.5 |
| LMArena WebDev: HTML | 1510 | 1276 | Claude Opus 4.5 |
| LMArena WebDev: from an image | Not measured | 1336 | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 15 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| AA Intelligence Index | 29.1 | 15.6 | Claude Opus 4.5 |
| Epoch Capabilities Index | 150.1 | Not measured | Only Claude Opus 4.5 measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index17 boards, none shared
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 1.6 | Only Gemini 3.1 Flash Lite Preview measured |
| Design Arena: agents building web apps | 1159 | Not measured | Only Claude Opus 4.5 measured |
| Design Arena: agents building full-stack apps | 1156 | Not measured | Only Claude Opus 4.5 measured |
| Design Arena: agents building mobile apps | 1189 | Not measured | Only Claude Opus 4.5 measured |
| Design Arena: agents building Android apps | 1181 | Not measured | Only Claude Opus 4.5 measured |
| Finance Agent (Vals AI) | Not measured | 30.0% | Only Gemini 3.1 Flash Lite Preview measured |
| Tax Agent Bench (Vals AI) | Not measured | 3.1% | Only Gemini 3.1 Flash Lite Preview measured |
| Legal Research Bench (Vals AI) | Not measured | 3.4% | Only Gemini 3.1 Flash Lite Preview measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 8.6% | Only Gemini 3.1 Flash Lite Preview measured |
| τ²-Bench Telecom | 89.5% | Not measured | Only Claude Opus 4.5 measured |
| METR time horizons | 75.0% | Not measured | Only Claude Opus 4.5 measured |
| Remote Labor Index | 3.8% | Not measured | Only Claude Opus 4.5 measured |
| GDPval | 45.5% | Not measured | Only Claude Opus 4.5 measured |
| BALROG | 43.5% | Not measured | Only Claude Opus 4.5 measured |
| DeepResearch Bench | 54.8% | Not measured | Only Claude Opus 4.5 measured |
| OSWorld | 66.3% | Not measured | Only Claude Opus 4.5 measured |
| Vending-Bench 2 | $4,967 | Not measured | Only Claude Opus 4.5 measured |
| Neither model has a result on the other 22 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| GPQA Diamond | 85.9% | 81.1% | Claude Opus 4.5 |
| MMMU Pro (Vals AI) | 83.0% | 82.5% | Claude Opus 4.5 |
| GPQA Diamond (Artificial Analysis run) | 86.6% | Not measured | Only Claude Opus 4.5 measured |
| Humanity's Last Exam (Artificial Analysis run) | 30.1% | Not measured | Only Claude Opus 4.5 measured |
| GPQA Diamond (Epoch AI run) | 86.0% | Not measured | Only Claude Opus 4.5 measured |
| ARC-AGI | 80.0% | Not measured | Only Claude Opus 4.5 measured |
| ARC-AGI-2 | 37.6% | Not measured | Only Claude Opus 4.5 measured |
| SimpleBench | 62.0% | Not measured | Only Claude Opus 4.5 measured |
| Chess puzzles | 14.0% | Not measured | Only Claude Opus 4.5 measured |
| Mystery game puzzles | 22.0% | Not measured | Only Claude Opus 4.5 measured |
| EBR-bench | 14.3% | Not measured | Only Claude Opus 4.5 measured |
| VPCT | 40.0% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: hard prompts | 1476 | 1407 | Claude Opus 4.5 |
| LMArena Text: expert | 1487 | 1398 | Claude Opus 4.5 |
| LMArena Text: hard prompts in English | 1482 | 1403 | Claude Opus 4.5 |
| LMArena Vision: diagrams | Not measured | 1242 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: homework | Not measured | 1271 | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 4 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| AIME | 95.4% | 83.3% | Claude Opus 4.5 |
| MGSM (Vals AI) | 95.2% | Not measured | Only Claude Opus 4.5 measured |
| AA Math Index | 91.3 | Not measured | Only Claude Opus 4.5 measured |
| AIME 2025 (Artificial Analysis run) | 91.3% | Not measured | Only Claude Opus 4.5 measured |
| OTIS Mock AIME | 86.1% | Not measured | Only Claude Opus 4.5 measured |
| FrontierMath, tiers 1 to 3 | 34.4% | Not measured | Only Claude Opus 4.5 measured |
| FrontierMath, tier 4 | 4.9% | Not measured | Only Claude Opus 4.5 measured |
| ProofBench | 36.0% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: math | 1463 | 1428 | Claude Opus 4.5 |
| LMArena Text: mathematical work | 1468 | 1417 | Claude Opus 4.5 |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| MMLU Pro | 87.3% | 86.2% | Claude Opus 4.5 |
| LegalBench (Vals AI) | 84.6% | 83.8% | Claude Opus 4.5 |
| CaseLaw (Vals AI) | 62.6% | 55.0% | Claude Opus 4.5 |
| CorpFin (Vals AI) | 65.1% | 59.4% | Claude Opus 4.5 |
| TaxEval (Vals AI) | 74.9% | 71.8% | Claude Opus 4.5 |
| MortgageTax (Vals AI) | 68.7% | 68.0% | Claude Opus 4.5 |
| MedQA (Vals AI) | 95.9% | Not measured | Only Claude Opus 4.5 measured |
| MedCode (Vals AI) | 49.2% | 47.6% | Claude Opus 4.5 |
| MMLU Pro (Artificial Analysis run) | 89.5% | Not measured | Only Claude Opus 4.5 measured |
| SimpleQA Verified | 45.7% | Not measured | Only Claude Opus 4.5 measured |
| GeoBench | 75.0% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text: science | 1454 | 1425 | Claude Opus 4.5 |
| LMArena Text: medicine and healthcare | 1444 | 1428 | Claude Opus 4.5 |
| LMArena Text: legal and government | 1459 | 1418 | Claude Opus 4.5 |
| LMArena Text: business and finance | 1448 | 1389 | Claude Opus 4.5 |
| Neither model has a result on the other 2 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| Design Arena: websites | 1247 | 1083 | Claude Opus 4.5 |
| Design Arena: UI components | 1238 | 1071 | Claude Opus 4.5 |
| Design Arena: game dev | 1229 | 1029 | Claude Opus 4.5 |
| Design Arena: data viz | 1243 | 1045 | Claude Opus 4.5 |
| Design Arena: 3D | 1214 | 1048 | Claude Opus 4.5 |
| Design Arena: all code categories | 1242 | 1072 | Claude Opus 4.5 |
| Design Arena: SVG | 1180 | 1052 | Claude Opus 4.5 |
| Design Arena: ASCII art | 1190 | 1166 | Claude Opus 4.5 |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index181
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 52.1% | 49.5% | Claude Opus 4.5 |
| MedScribe (Vals AI) | 85.3% | 63.9% | Claude Opus 4.5 |
| Vals Multimodal Index | Not measured | 41.4% | Only Gemini 3.1 Flash Lite Preview measured |
| IFBench | 58.0% | Not measured | Only Claude Opus 4.5 measured |
| Long context reasoning (AA-LCR) | 77.3% | Not measured | Only Claude Opus 4.5 measured |
| DTBench | 89.9% | Not measured | Only Claude Opus 4.5 measured |
| LMCA | 44.5% | Not measured | Only Claude Opus 4.5 measured |
| CL-bench | 21.1% | Not measured | Only Claude Opus 4.5 measured |
| Furniture assembly | 28.3% | Not measured | Only Claude Opus 4.5 measured |
| LMArena Text | 1451 | 1416 | Claude Opus 4.5 |
| LMArena Text: instruction following | 1478 | 1377 | Claude Opus 4.5 |
| LMArena Text: creative writing | 1445 | 1401 | Claude Opus 4.5 |
| LMArena Vision | Not measured | 1240 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: English | 1461 | 1414 | Claude Opus 4.5 |
| LMArena Text: non-English | 1438 | 1410 | Claude Opus 4.5 |
| LMArena Text: Chinese | 1470 | 1460 | Claude Opus 4.5 |
| LMArena Text: German | 1449 | 1430 | Claude Opus 4.5 |
| LMArena Text: Japanese | 1417 | 1413 | Claude Opus 4.5 |
| LMArena Text: Korean | 1424 | 1392 | Claude Opus 4.5 |
| LMArena Text: French | 1471 | 1424 | Claude Opus 4.5 |
| LMArena Text: Spanish | 1457 | 1421 | Claude Opus 4.5 |
| LMArena Text: Russian | 1447 | 1420 | Claude Opus 4.5 |
| LMArena Text: Polish | 1439 | 1443 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: multi-turn | 1466 | 1417 | Claude Opus 4.5 |
| LMArena Text: longer queries | 1479 | 1394 | Claude Opus 4.5 |
| LMArena Text: writing and language | 1452 | 1408 | Claude Opus 4.5 |
| LMArena Text: entertainment and media | 1434 | 1386 | Claude Opus 4.5 |
| LMArena Vision: English | Not measured | 1232 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: Chinese | Not measured | 1278 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: reading text | Not measured | 1246 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: humor | Not measured | 1266 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: captioning | Not measured | 1259 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: recognizing things | Not measured | 1308 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: creative writing | Not measured | 1248 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Document | 1462 | Not measured | Only Claude Opus 4.5 measured |
| Neither model has a result on the other 11 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 4.5 | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview costs less
Repository review
50K input + 3K output tokens
Gemini 3.1 Flash Lite Preview costs less
Agent loop
200K input + 10K output tokens
Gemini 3.1 Flash Lite Preview costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Anthropic Claude Opus 4.5 | Google Gemini 3.1 Flash Lite Preview |
|---|---|---|
| Maker | Anthropic | |
| Weights | No public weights listed | No public weights listed |
| Released | November 24, 2025 | March 3, 2026 |
| Context window | 200K | 1.05M |
| Input $/Mtok | $5.00 | $0.25 |
| Output $/Mtok | $25.00 | $1.50 |
| Coding index | 66.8 | 8.1 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $1.37 | $0.18 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.5 better than Gemini 3.1 Flash Lite Preview for coding?
Pick Claude Opus 4.5 for coding: it scores 66.8 on the Vibe Coding Index against 8.1 for Gemini 3.1 Flash Lite Preview. Pick Gemini 3.1 Flash Lite Preview when output tokens cost 16.7x less, or when a solved task costs $0.18 against $1.37.
Which is cheaper, Claude Opus 4.5 or Gemini 3.1 Flash Lite Preview?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Gemini 3.1 Flash Lite Preview $0.18.
Which has the bigger context window, Claude Opus 4.5 or Gemini 3.1 Flash Lite Preview?
Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 200K.
How many benchmarks is the Claude Opus 4.5 vs Gemini 3.1 Flash Lite Preview comparison based on?
55 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 2 independent benchmarks and Gemini 3.1 Flash Lite Preview's on 1. Where only one model has a result, the page says so instead of naming a winner.