Claude Haiku 5.5 vs Gemini 3.5 Flash
Claude Haiku 5.5 leads Gemini 3.5 Flash on coding, 70.7 to 39.8 on the Vibe Coding Index, and Claude Haiku 5.5 costs 18.0x less per output token ($0.50 vs $9.00 per million). Updated October 22, 2026; 43 benchmarks have a result for both.
vs boards won of 43 shared
Claude Haiku 5.5 or Gemini 3.5 Flash: which to pick
Pick Claude Haiku 5.5 for coding: it scores 70.7 on the Vibe Coding Index against 39.8 for Gemini 3.5 Flash.
Pick Gemini 3.5 Flash for a larger context window (1.05M against 1M tokens) and work measured by SciCode or Finance Agent (Vals AI), where it leads.
Model AClaude Haiku 5.5Anthropic70.7/1005 independent benchmarksNo cost per solved taskModel BGemini 3.5 FlashGoogle39.8/1004 independent benchmarks$1.21 per solved task
- Shared results
- 43
- Claude Haiku 5.5 only
- 20
- Gemini 3.5 Flash only
- 69
- Like-for-like categories
- 8 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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
Claude Haiku 5.5
Claude Haiku 5.5 scores 70.7 against 39.8.
5 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Haiku 5.5
Claude Haiku 5.5 leads, 43.4 against 33.6.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Gemini 3.5 Flash has a GPQA Diamond result, 92.7%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.5 Flash has a MMLU Pro result, 89.5%.
Directional only
Web design
Design Arena: websites
Gemini 3.5 Flash
Gemini 3.5 Flash leads, 1267 against 1262.
Same board, both measured
General
Vals Index
No call
Only Claude Haiku 5.5 has a Vals Index result, 58.7%.
Directional only
Long documents
Listed context window
Gemini 3.5 Flash
Gemini 3.5 Flash takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Claude Haiku 5.5
Claude Haiku 5.5 $0.0003, Gemini 3.5 Flash $0.0060 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.5 Flash has the number, $1.21.
Directional only
At a glance
- Coding index
- Claude Haiku 5.5 70.7 from 5 benchmarks, Gemini 3.5 Flash 39.8 from 4 benchmarks.
- Widest category
- Knowledge, 23.3 points apart on average over 2 shared benchmarks.
- Widest single gap
- ProofBench: Claude Haiku 5.5 89.0% against Gemini 3.5 Flash 31.0%, 58.0 points apart on a 0 to 100 scale.
- Output price
- Claude Haiku 5.5 $0.50 against Gemini 3.5 Flash $9.00 per million output tokens, 18.0x apart.
- Context window
- Claude Haiku 5.5 takes 1M tokens, Gemini 3.5 Flash 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 Haiku 5.5 | Bars | Gemini 3.5 Flash | Ties |
|---|---|---|---|---|
| Coding | 8 | 1 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 4 | 3 | ||
| Reasoning | 3 | 4 | ||
| Math | 4 | 0 | ||
| Knowledge | 0 | 2 | ||
| Web design | 5 | 1 | ||
| General | 5 | 1 | ||
| All shared boards | 31 | 12 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index81
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| LiveBench coding | 91.4% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena WebDev | 1586 | 1499 | Claude Haiku 5.5 |
| LiveCodeBench (Vals AI) | Not measured | 87.6% | Only Gemini 3.5 Flash measured |
| SWE-bench Verified (Vals AI) | Not measured | 78.8% | Only Gemini 3.5 Flash measured |
| Terminal-Bench 4 (Vals AI) | 36.4% | 6.1% | Claude Haiku 5.5 |
| Vibe Code Bench (Vals AI) | 90.4% | 48.7% | Claude Haiku 5.5 |
| Code migration (Vals AI) | 44.6% | 26.8% | Claude Haiku 5.5 |
| ProgramBench (Vals AI) | 2.5% | 0.0% | Claude Haiku 5.5 |
| IOI (Vals AI) | 47.3% | Not measured | Only Claude Haiku 5.5 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 74.2% | Only Gemini 3.5 Flash measured |
| SWE-bench Multimodal (Vals AI) | 44.0% | Not measured | Only Claude Haiku 5.5 measured |
| Vibe Code Bench 1-100 (Vals AI) | 20.4% | Not measured | Only Claude Haiku 5.5 measured |
| SkillsBench (Vals AI) | Not measured | 52.7% | Only Gemini 3.5 Flash measured |
| CyberBench (Vals AI) | 75.5% | Not measured | Only Claude Haiku 5.5 measured |
| SciCode | 55.0% | 53.9% | Claude Haiku 5.5 |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 46.2% | Only Gemini 3.5 Flash measured |
| FrontierCode | 46.4% | Not measured | Only Claude Haiku 5.5 measured |
| FrontierSWE | 43.8% | Not measured | Only Claude Haiku 5.5 measured |
| WeirdML | Not measured | 62.6% | Only Gemini 3.5 Flash measured |
| ALE-Bench | Not measured | 911.0 | Only Gemini 3.5 Flash measured |
| LMArena Text: coding | Not measured | 1493 | Only Gemini 3.5 Flash measured |
| LMArena Text: software and IT | Not measured | 1494 | Only Gemini 3.5 Flash measured |
| LMArena WebDev: React | 1605 | 1495 | Claude Haiku 5.5 |
| LMArena WebDev: HTML | 1569 | 1522 | Claude Haiku 5.5 |
| LMArena WebDev: from an image | Not measured | 1504 | Only Gemini 3.5 Flash measured |
| SciCode | 9.2% | 12.3% | Gemini 3.5 Flash |
| Neither model has a result on the other 13 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| AA Intelligence Index | 43.4 | 33.6 | Claude Haiku 5.5 |
| Epoch Capabilities Index | 159.3 | 154.9 | Claude Haiku 5.5 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index43
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | Not measured | 1202 | Only Gemini 3.5 Flash measured |
| Design Arena: agents building full-stack apps | Not measured | 1197 | Only Gemini 3.5 Flash measured |
| Design Arena: agents building mobile apps | Not measured | 1174 | Only Gemini 3.5 Flash measured |
| Design Arena: agents building Android apps | Not measured | 1185 | Only Gemini 3.5 Flash measured |
| Design Arena: agents building Godot games | Not measured | 1098 | Only Gemini 3.5 Flash measured |
| Design Arena: agents building games | Not measured | 1180 | Only Gemini 3.5 Flash measured |
| Design Arena: HTML slides | Not measured | 1093 | Only Gemini 3.5 Flash measured |
| Design Arena: PowerPoint slides | Not measured | 1154 | Only Gemini 3.5 Flash measured |
| LiveBench research | 81.9% | Not measured | Only Claude Haiku 5.5 measured |
| LiveBench browser | 80.0% | Not measured | Only Claude Haiku 5.5 measured |
| LiveBench long agentic | 57.6% | Not measured | Only Claude Haiku 5.5 measured |
| SREBench (Vals AI) | 5.7% | Not measured | Only Claude Haiku 5.5 measured |
| Finance Agent (Vals AI) | 54.1% | 57.9% | Gemini 3.5 Flash |
| Tax Agent Bench (Vals AI) | 31.9% | 21.6% | Claude Haiku 5.5 |
| Legal Research Bench (Vals AI) | 43.3% | 30.8% | Claude Haiku 5.5 |
| Harvey's Legal Agent Benchmark (Vals AI) | 4.2% | Not measured | Only Claude Haiku 5.5 measured |
| Excel Modeling Benchmark (Vals AI) | 59.0% | 63.5% | Gemini 3.5 Flash |
| BioMysteryBench (Vals AI) | 70.4% | Not measured | Only Claude Haiku 5.5 measured |
| Terminal-Bench-Science (Vals AI) | 10.0% | 5.7% | Claude Haiku 5.5 |
| Vals Science Index | 38.5% | Not measured | Only Claude Haiku 5.5 measured |
| τ²-Bench Telecom | Not measured | 95.6% | Only Gemini 3.5 Flash measured |
| APEX-Agents | 56.1% | 27.5% | Claude Haiku 5.5 |
| Vending-Bench 2 | $3,602 | $5,396 | Gemini 3.5 Flash |
| Neither model has a result on the other 18 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index34
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 92.7% | Only Gemini 3.5 Flash measured |
| LiveBench reasoning | 82.4% | Not measured | Only Claude Haiku 5.5 measured |
| MysteryMechanism (Vals AI) | 35.1% | Not measured | Only Claude Haiku 5.5 measured |
| MMMU Pro (Vals AI) | Not measured | 88.3% | Only Gemini 3.5 Flash measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 92.2% | Only Gemini 3.5 Flash measured |
| Humanity's Last Exam (Artificial Analysis run) | 44.4% | 42.7% | Claude Haiku 5.5 |
| GPQA Diamond (Epoch AI run) | 89.6% | 92.8% | Gemini 3.5 Flash |
| ARC-AGI | 89.0% | 92.5% | Gemini 3.5 Flash |
| ARC-AGI-2 | 61.3% | 72.1% | Gemini 3.5 Flash |
| SimpleBench | Not measured | 76.7% | Only Gemini 3.5 Flash measured |
| Chess puzzles | 55.0% | 45.0% | Claude Haiku 5.5 |
| Mystery game puzzles | 30.0% | 32.0% | Gemini 3.5 Flash |
| EBR-bench | 43.8% | 4.8% | Claude Haiku 5.5 |
| LMArena Text: hard prompts | Not measured | 1488 | Only Gemini 3.5 Flash measured |
| LMArena Text: expert | Not measured | 1495 | Only Gemini 3.5 Flash measured |
| LMArena Text: hard prompts in English | Not measured | 1483 | Only Gemini 3.5 Flash measured |
| LMArena Vision: diagrams | Not measured | 1323 | Only Gemini 3.5 Flash measured |
| LMArena Vision: homework | Not measured | 1330 | Only Gemini 3.5 Flash measured |
| Neither model has a result on the other 4 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| OTIS Mock AIME | 98.9% | 95.6% | Claude Haiku 5.5 |
| FrontierMath, tiers 1 to 3 | 75.1% | 62.8% | Claude Haiku 5.5 |
| FrontierMath, tier 4 | 46.3% | 26.8% | Claude Haiku 5.5 |
| ProofBench | 89.0% | 31.0% | Claude Haiku 5.5 |
| LMArena Text: math | Not measured | 1504 | Only Gemini 3.5 Flash measured |
| LMArena Text: mathematical work | Not measured | 1495 | Only Gemini 3.5 Flash measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 89.5% | Only Gemini 3.5 Flash measured |
| LegalBench (Vals AI) | Not measured | 83.6% | Only Gemini 3.5 Flash measured |
| CorpFin (Vals AI) | Not measured | 64.7% | Only Gemini 3.5 Flash measured |
| TaxEval (Vals AI) | Not measured | 74.4% | Only Gemini 3.5 Flash measured |
| MortgageTax (Vals AI) | Not measured | 68.1% | Only Gemini 3.5 Flash measured |
| MedCode (Vals AI) | 51.5% | 55.8% | Gemini 3.5 Flash |
| SimpleQA Verified | 23.8% | 66.2% | Gemini 3.5 Flash |
| LMArena Text: science | Not measured | 1495 | Only Gemini 3.5 Flash measured |
| LMArena Text: medicine and healthcare | Not measured | 1483 | Only Gemini 3.5 Flash measured |
| LMArena Text: legal and government | Not measured | 1488 | Only Gemini 3.5 Flash measured |
| LMArena Text: business and finance | Not measured | 1467 | Only Gemini 3.5 Flash measured |
| FACTS Benchmark Suite | Not measured | 63.1% | Only Gemini 3.5 Flash measured |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index51
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| Design Arena: websites | 1262 | 1267 | Gemini 3.5 Flash |
| Design Arena: UI components | 1291 | 1269 | Claude Haiku 5.5 |
| Design Arena: game dev | 1313 | 1263 | Claude Haiku 5.5 |
| Design Arena: data viz | 1294 | 1236 | Claude Haiku 5.5 |
| Design Arena: 3D | 1342 | 1243 | Claude Haiku 5.5 |
| Design Arena: all code categories | 1278 | 1266 | Claude Haiku 5.5 |
| Design Arena: SVG | Not measured | 1253 | Only Gemini 3.5 Flash measured |
| Design Arena: ASCII art | Not measured | 1254 | Only Gemini 3.5 Flash measured |
| LiveBench design | 83.1% | Not measured | Only Claude Haiku 5.5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index51
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | Leader |
|---|---|---|---|
| Vals Index | 58.7% | Not measured | Only Claude Haiku 5.5 measured |
| LiveBench data analysis | 53.1% | Not measured | Only Claude Haiku 5.5 measured |
| Public Benefits Bench (Vals AI) | 63.2% | 59.5% | Claude Haiku 5.5 |
| SAGE (Vals AI) | 45.8% | 49.9% | Gemini 3.5 Flash |
| MedScribe (Vals AI) | 89.5% | 76.6% | Claude Haiku 5.5 |
| Vals Multimodal Index | Not measured | 62.9% | Only Gemini 3.5 Flash measured |
| IFBench | Not measured | 76.3% | Only Gemini 3.5 Flash measured |
| Long context reasoning (AA-LCR) | 82.7% | 74.3% | Claude Haiku 5.5 |
| DTBench | 95.0% | 94.7% | Claude Haiku 5.5 |
| LMCA | 51.1% | 47.1% | Claude Haiku 5.5 |
| Surface Evolver Bench | Not measured | 58.1% | Only Gemini 3.5 Flash measured |
| Furniture assembly | 47.5% | Not measured | Only Claude Haiku 5.5 measured |
| LMArena Text | Not measured | 1482 | Only Gemini 3.5 Flash measured |
| LMArena Text: instruction following | Not measured | 1467 | Only Gemini 3.5 Flash measured |
| LMArena Text: creative writing | Not measured | 1470 | Only Gemini 3.5 Flash measured |
| LMArena Vision | Not measured | 1308 | Only Gemini 3.5 Flash measured |
| LMArena Text: English | Not measured | 1481 | Only Gemini 3.5 Flash measured |
| LMArena Text: non-English | Not measured | 1475 | Only Gemini 3.5 Flash measured |
| LMArena Text: Chinese | Not measured | 1527 | Only Gemini 3.5 Flash measured |
| LMArena Text: German | Not measured | 1494 | Only Gemini 3.5 Flash measured |
| LMArena Text: Japanese | Not measured | 1486 | Only Gemini 3.5 Flash measured |
| LMArena Text: Korean | Not measured | 1448 | Only Gemini 3.5 Flash measured |
| LMArena Text: French | Not measured | 1490 | Only Gemini 3.5 Flash measured |
| LMArena Text: Spanish | Not measured | 1480 | Only Gemini 3.5 Flash measured |
| LMArena Text: Russian | Not measured | 1493 | Only Gemini 3.5 Flash measured |
| LMArena Text: Polish | Not measured | 1516 | Only Gemini 3.5 Flash measured |
| LMArena Text: multi-turn | Not measured | 1481 | Only Gemini 3.5 Flash measured |
| LMArena Text: longer queries | Not measured | 1483 | Only Gemini 3.5 Flash measured |
| LMArena Text: writing and language | Not measured | 1478 | Only Gemini 3.5 Flash measured |
| LMArena Text: entertainment and media | Not measured | 1459 | Only Gemini 3.5 Flash measured |
| LMArena Vision: English | Not measured | 1305 | Only Gemini 3.5 Flash measured |
| LMArena Vision: Chinese | Not measured | 1377 | Only Gemini 3.5 Flash measured |
| LMArena Vision: reading text | Not measured | 1317 | Only Gemini 3.5 Flash measured |
| LMArena Vision: humor | Not measured | 1321 | Only Gemini 3.5 Flash measured |
| LMArena Vision: creative writing | Not measured | 1301 | Only Gemini 3.5 Flash measured |
| LMArena Document | Not measured | 1463 | Only Gemini 3.5 Flash measured |
| Neither model has a result on the other 10 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Haiku 5.5 | Gemini 3.5 Flash | 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 Haiku 5.5$0.0003Fits in one request
Gemini 3.5 Flash$0.0060Fits in one request
Claude Haiku 5.5 costs less
Repository review
50K input + 3K output tokens
Claude Haiku 5.5$0.0065Fits in one request
Gemini 3.5 Flash$0.102Fits in one request
Claude Haiku 5.5 costs less
Agent loop
200K input + 10K output tokens
Claude Haiku 5.5$0.025Fits in one request
Gemini 3.5 Flash$0.390Fits in one request
Claude Haiku 5.5 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 Haiku 5.5 | Google Gemini 3.5 Flash |
|---|---|---|
| Maker | Anthropic | |
| Weights | No public weights listed | No public weights listed |
| Released | October 7, 2026 | May 19, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $0.10 | $1.50 |
| Output $/Mtok | $0.50 | $9.00 |
| Coding index | 70.7 | 39.8 |
| Independent measurements behind it | 5 | 4 |
| Cost per solved task | Not computable | $1.21 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Haiku 5.5 better than Gemini 3.5 Flash for coding?
Pick Claude Haiku 5.5 for coding: it scores 70.7 on the Vibe Coding Index against 39.8 for Gemini 3.5 Flash. Pick Gemini 3.5 Flash for a larger context window (1.05M against 1M tokens) and work measured by SciCode or Finance Agent (Vals AI), where it leads.
Which is cheaper, Claude Haiku 5.5 or Gemini 3.5 Flash?
Claude Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens; Gemini 3.5 Flash costs $1.50 and $9.00. Cost per solved task is known for Gemini 3.5 Flash only.
Which has the bigger context window, Claude Haiku 5.5 or Gemini 3.5 Flash?
Gemini 3.5 Flash, with 1.05M tokens against 1M.
How many benchmarks is the Claude Haiku 5.5 vs Gemini 3.5 Flash comparison based on?
43 benchmarks have a result for both models as of October 22, 2026. Claude Haiku 5.5's coding index rests on 5 independent benchmarks and Gemini 3.5 Flash's on 4. Where only one model has a result, the page says so instead of naming a winner.