Claude Opus 5 vs Gemini 2.5 Flash Lite
Updated October 21, 2026. 18 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
vs boards won of 18 shared
Decision reading
Only Claude Opus 5 has a coding score, 83.0 on the Vibe Coding Index; Gemini 2.5 Flash Lite has none, so the two cannot be ranked on coding.
Gemini 2.5 Flash Lite has the edge where output tokens cost 62.5x less, and where the context window is larger, 1.05M against 1M tokens.
Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BGemini 2.5 Flash LiteGoogleNot benchmarkedNo coding benchmarkNo cost per solved task
- Shared results
- 18
- Claude Opus 5 only
- 112
- Gemini 2.5 Flash Lite only
- 10
- Like-for-like categories
- 5 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, six public coding benchmarks
No call
Only Claude Opus 5 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Claude Opus 5
Claude Opus 5 leads, 50.8 against 10.4.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Claude Opus 5 has a AA Agentic Index result, 56.5.
Directional only
Reasoning
GPQA Diamond
Claude Opus 5
Claude Opus 5 leads, 93.4% against 70.2%.
Same board, both measured
Math
AIME
No call
Only Gemini 2.5 Flash Lite has a AIME result, 42.1%.
Directional only
Knowledge
MMLU Pro
Claude Opus 5
Claude Opus 5 leads, 91.6% against 79.1%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Claude Opus 5 has a Design Arena: websites result, 1309.
Directional only
Long documents
Listed context window
Gemini 2.5 Flash Lite
Gemini 2.5 Flash Lite takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 2.5 Flash Lite
Claude Opus 5 $0.018, Gemini 2.5 Flash Lite $0.0003 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Opus 5 has the number, $1.33.
Directional only
At a glance
- Coding index
- Claude Opus 5 83.0 from 6 benchmarks, Gemini 2.5 Flash Lite not benchmarked.
- Widest category
- Intelligence, 39.0 points apart on average over 2 shared benchmarks.
- Widest single gap
- Humanity's Last Exam (Artificial Analysis run): Claude Opus 5 54.9% against Gemini 2.5 Flash Lite 6.8%, 48.1 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 5 $25.00 against Gemini 2.5 Flash Lite $0.40 per million output tokens, 62.5x apart.
- Context window
- Claude Opus 5 takes 1M tokens, Gemini 2.5 Flash Lite 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 5 | Bars | Gemini 2.5 Flash Lite | Ties |
|---|---|---|---|---|
| Coding | 1 | 0 | ||
| Intelligence | 2 | 0 | ||
| Reasoning | 4 | 0 | ||
| Knowledge | 6 | 0 | ||
| General | 5 | 0 | ||
| All shared boards | 18 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index10
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| LiveBench coding | 90.8% | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev | 1689 | Not measured | Only Claude Opus 5 measured |
| AA Coding Index | 78.0 | Not measured | Only Claude Opus 5 measured |
| LiveCodeBench (Vals AI) | 89.0% | 71.4% | Claude Opus 5 |
| SWE-bench Verified (Vals AI) | 97.0% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench 4 (Vals AI) | 53.5% | Not measured | Only Claude Opus 5 measured |
| Vibe Code Bench (Vals AI) | 88.4% | Not measured | Only Claude Opus 5 measured |
| Code migration (Vals AI) | 57.5% | Not measured | Only Claude Opus 5 measured |
| ProgramBench (Vals AI) | 3.0% | Not measured | Only Claude Opus 5 measured |
| IOI (Vals AI) | 84.3% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench 2.1 (Vals AI) | 84.6% | Not measured | Only Claude Opus 5 measured |
| Vibe Code Bench 1-100 (Vals AI) | 28.5% | Not measured | Only Claude Opus 5 measured |
| SkillsBench (Vals AI) | 60.4% | Not measured | Only Claude Opus 5 measured |
| CyberBench (Vals AI) | 65.4% | Not measured | Only Claude Opus 5 measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 59.3% | Only Gemini 2.5 Flash Lite measured |
| SciCode | 56.4% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 4.5% | Only Gemini 2.5 Flash Lite measured |
| FrontierCode | 53.4% | Not measured | Only Claude Opus 5 measured |
| FrontierSWE | 52.0% | Not measured | Only Claude Opus 5 measured |
| WeirdML | 91.8% | Not measured | Only Claude Opus 5 measured |
| ALE-Bench | 2164.6 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: coding | 1533 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: software and IT | 1527 | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev: React | 1711 | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev: HTML | 1680 | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev: from an image | 1662 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 12 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| AA Intelligence Index | 50.8 | 10.4 | Claude Opus 5 |
| Epoch Capabilities Index | 163.9 | 133.8 | Claude Opus 5 |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index28 boards, none shared
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| AA Agentic Index | 56.5 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building web apps | 1266 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building full-stack apps | 1306 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building mobile apps | 1348 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building Android apps | 1260 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building Godot games | 1279 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building games | 1261 | Not measured | Only Claude Opus 5 measured |
| Design Arena: PowerPoint slides | 1265 | Not measured | Only Claude Opus 5 measured |
| LiveBench research | 88.9% | Not measured | Only Claude Opus 5 measured |
| LiveBench browser | 84.0% | Not measured | Only Claude Opus 5 measured |
| LiveBench long agentic | 62.1% | Not measured | Only Claude Opus 5 measured |
| SREBench (Vals AI) | 12.2% | Not measured | Only Claude Opus 5 measured |
| Finance Agent (Vals AI) | 58.6% | Not measured | Only Claude Opus 5 measured |
| Tax Agent Bench (Vals AI) | 45.5% | Not measured | Only Claude Opus 5 measured |
| Legal Research Bench (Vals AI) | 55.3% | Not measured | Only Claude Opus 5 measured |
| Excel Modeling Benchmark (Vals AI) | 73.6% | Not measured | Only Claude Opus 5 measured |
| BioMysteryBench (Vals AI) | 79.3% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench-Science (Vals AI) | 27.1% | Not measured | Only Claude Opus 5 measured |
| Vals Science Index | 47.9% | Not measured | Only Claude Opus 5 measured |
| Time Horizon Index (Vals AI) | 18.8% | Not measured | Only Claude Opus 5 measured |
| CUA-bench (Vals AI) | 9.0% | Not measured | Only Claude Opus 5 measured |
| τ²-Bench Telecom | Not measured | 19.0% | Only Gemini 2.5 Flash Lite measured |
| APEX-Agents | 65.8% | Not measured | Only Claude Opus 5 measured |
| OSWorld 2.0 | 31.4% | Not measured | Only Claude Opus 5 measured |
| BALROG | 63.4% | Not measured | Only Claude Opus 5 measured |
| PostTrainBench | 35.0% | Not measured | Only Claude Opus 5 measured |
| Vending-Bench 2 | $11,182 | Not measured | Only Claude Opus 5 measured |
| LMArena Search | 1242 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 11 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| GPQA Diamond | 93.4% | 70.2% | Claude Opus 5 |
| LiveBench reasoning | 91.2% | Not measured | Only Claude Opus 5 measured |
| MysteryMechanism (Vals AI) | 37.4% | Not measured | Only Claude Opus 5 measured |
| MMMU Pro (Vals AI) | 89.9% | 75.4% | Claude Opus 5 |
| GPQA Diamond (Artificial Analysis run) | 93.7% | 62.5% | Claude Opus 5 |
| Humanity's Last Exam (Artificial Analysis run) | 54.9% | 6.8% | Claude Opus 5 |
| GPQA Diamond (Epoch AI run) | 93.9% | Not measured | Only Claude Opus 5 measured |
| ARC-AGI | 97.5% | Not measured | Only Claude Opus 5 measured |
| ARC-AGI-2 | 90.4% | Not measured | Only Claude Opus 5 measured |
| SimpleBench | 80.6% | Not measured | Only Claude Opus 5 measured |
| Chess puzzles | 43.0% | Not measured | Only Claude Opus 5 measured |
| Mystery game puzzles | 59.0% | Not measured | Only Claude Opus 5 measured |
| EBR-bench | 45.7% | Not measured | Only Claude Opus 5 measured |
| LMArena Text: hard prompts | 1527 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: expert | 1554 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: hard prompts in English | 1523 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: diagrams | 1348 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: homework | 1338 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 3 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index10 boards, none shared
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| AIME | Not measured | 42.1% | Only Gemini 2.5 Flash Lite measured |
| MGSM (Vals AI) | Not measured | 89.5% | Only Gemini 2.5 Flash Lite measured |
| AA Math Index | Not measured | 53.3 | Only Gemini 2.5 Flash Lite measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 53.3% | Only Gemini 2.5 Flash Lite measured |
| OTIS Mock AIME | 98.9% | Not measured | Only Claude Opus 5 measured |
| FrontierMath, tiers 1 to 3 | 85.6% | Not measured | Only Claude Opus 5 measured |
| FrontierMath, tier 4 | 73.2% | Not measured | Only Claude Opus 5 measured |
| ProofBench | 99.0% | Not measured | Only Claude Opus 5 measured |
| LMArena Text: math | 1533 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: mathematical work | 1544 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| MMLU Pro | 91.6% | 79.1% | Claude Opus 5 |
| LegalBench (Vals AI) | 87.0% | 82.0% | Claude Opus 5 |
| CorpFin (Vals AI) | 73.2% | 57.6% | Claude Opus 5 |
| TaxEval (Vals AI) | 75.1% | 66.2% | Claude Opus 5 |
| MortgageTax (Vals AI) | 72.1% | 57.6% | Claude Opus 5 |
| MedQA (Vals AI) | Not measured | 88.9% | Only Gemini 2.5 Flash Lite measured |
| MedCode (Vals AI) | 63.6% | 34.2% | Claude Opus 5 |
| MMLU Pro (Artificial Analysis run) | Not measured | 75.9% | Only Gemini 2.5 Flash Lite measured |
| SimpleQA Verified | 59.9% | Not measured | Only Claude Opus 5 measured |
| LMArena Text: science | 1531 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: medicine and healthcare | 1525 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: legal and government | 1530 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: business and finance | 1501 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 4 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| Design Arena: websites | 1309 | Not measured | Only Claude Opus 5 measured |
| Design Arena: UI components | 1349 | Not measured | Only Claude Opus 5 measured |
| Design Arena: game dev | 1338 | Not measured | Only Claude Opus 5 measured |
| Design Arena: data viz | 1329 | Not measured | Only Claude Opus 5 measured |
| Design Arena: 3D | 1335 | Not measured | Only Claude Opus 5 measured |
| Design Arena: all code categories | 1324 | Not measured | Only Claude Opus 5 measured |
| Design Arena: SVG | 1311 | Not measured | Only Claude Opus 5 measured |
| Design Arena: ASCII art | 1352 | Not measured | Only Claude Opus 5 measured |
| LiveBench design | 83.0% | Not measured | Only Claude Opus 5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | Leader |
|---|---|---|---|
| LiveBench data analysis | 74.6% | Not measured | Only Claude Opus 5 measured |
| Public Benefits Bench (Vals AI) | 76.9% | Not measured | Only Claude Opus 5 measured |
| SAGE (Vals AI) | 49.4% | 30.8% | Claude Opus 5 |
| MedScribe (Vals AI) | 91.0% | 75.8% | Claude Opus 5 |
| Vals Multimodal Index | 73.9% | Not measured | Only Claude Opus 5 measured |
| IFBench | Not measured | 49.9% | Only Gemini 2.5 Flash Lite measured |
| Long context reasoning (AA-LCR) | 82.0% | 55.7% | Claude Opus 5 |
| DTBench | 97.9% | 62.8% | Claude Opus 5 |
| LMCA | 64.5% | 18.1% | Claude Opus 5 |
| Furniture assembly | 60.8% | Not measured | Only Claude Opus 5 measured |
| LMArena Text | 1509 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: instruction following | 1518 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: creative writing | 1493 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision | 1320 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: English | 1508 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: non-English | 1502 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Chinese | 1573 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: German | 1527 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Japanese | 1520 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Korean | 1517 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: French | 1519 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Spanish | 1523 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Russian | 1507 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Polish | 1522 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: multi-turn | 1500 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: longer queries | 1517 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: writing and language | 1499 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: entertainment and media | 1481 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: English | 1315 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: Chinese | 1400 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: reading text | 1329 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: humor | 1293 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: creative writing | 1313 | Not measured | Only Claude Opus 5 measured |
| LMArena Document | 1516 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 12 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 5 | Gemini 2.5 Flash Lite | 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
Claude Opus 5$0.018Fits in one request
Gemini 2.5 Flash Lite$0.0003Fits in one request
Gemini 2.5 Flash Lite costs less
Repository review
50K input + 3K output tokens
Claude Opus 5$0.325Fits in one request
Gemini 2.5 Flash Lite$0.0062Fits in one request
Gemini 2.5 Flash Lite costs less
Agent loop
200K input + 10K output tokens
Claude Opus 5$1.25Fits in one request
Gemini 2.5 Flash Lite$0.024Fits in one request
Gemini 2.5 Flash Lite 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 5 | Google Gemini 2.5 Flash Lite |
|---|---|---|
| Maker | Anthropic | |
| Weights | No public weights listed | No public weights listed |
| Released | July 24, 2026 | July 22, 2025 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $5.00 | $0.10 |
| Output $/Mtok | $25.00 | $0.40 |
| Coding index | 83.0 | Not benchmarked |
| Independent measurements behind it | 6 | 0 |
| Cost per solved task | $1.33 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 5 better than Gemini 2.5 Flash Lite for coding?
Only Claude Opus 5 has a coding score, 83.0 on the Vibe Coding Index; Gemini 2.5 Flash Lite has none, so the two cannot be ranked on coding. Gemini 2.5 Flash Lite has the edge where output tokens cost 62.5x less, and where the context window is larger, 1.05M against 1M tokens.
Which is cheaper, Claude Opus 5 or Gemini 2.5 Flash Lite?
Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 2.5 Flash Lite costs $0.10 and $0.40. Cost per solved task is known for Claude Opus 5 only.
Which has the bigger context window, Claude Opus 5 or Gemini 2.5 Flash Lite?
Gemini 2.5 Flash Lite, with 1.05M tokens against 1M.
How many benchmarks is the Claude Opus 5 vs Gemini 2.5 Flash Lite comparison based on?
18 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 6 independent benchmarks and Gemini 2.5 Flash Lite's on 0. Where only one model has a result, the page says so instead of naming a winner.