Claude Fable 5.2 vs Gemini 3.5 Flash Lite
Claude Fable 5.2 leads Gemini 3.5 Flash Lite on coding, 87.8 to 48.9 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 16.0x less per output token ($2.50 vs $40.00 per million). Updated November 14, 2026; 31 benchmarks have a result for both.
Claude Fable 5.2 or Gemini 3.5 Flash Lite: which to pick
Pick Claude Fable 5.2 for coding: it scores 87.8 on the Vibe Coding Index against 48.9 for Gemini 3.5 Flash Lite.
Pick Gemini 3.5 Flash Lite for output tokens 16.0x cheaper ($2.50 vs $40.00 per million) and a larger context window (1.05M against 1M tokens).
- Shared results
- 31
- Claude Fable 5.2 only
- 37
- Gemini 3.5 Flash Lite only
- 62
- Like-for-like categories
- 7 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 Fable 5.2
Claude Fable 5.2 scores 87.8 against 48.9.
4 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Fable 5.2
Claude Fable 5.2 leads, 64.6 against 11.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.5 Flash Lite has a AA Agentic Index result, 14.3.
Directional only
Reasoning
GPQA Diamond
No call
Only Gemini 3.5 Flash Lite has a GPQA Diamond result, 83.8%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.5 Flash Lite has a MMLU Pro result, 85.8%.
Directional only
Web design
Design Arena: websites
No call
Only Claude Fable 5.2 has a Design Arena: websites result, 1351.
Directional only
General
Vals Index
No call
Only Claude Fable 5.2 has a Vals Index result, 71.3%.
Directional only
Long documents
Listed context window
Gemini 3.5 Flash Lite
Gemini 3.5 Flash Lite takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.5 Flash Lite
Claude Fable 5.2 $0.028, Gemini 3.5 Flash Lite $0.0015 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.5 Flash Lite has the number, $0.41.
Directional only
At a glance
- Coding index
- Claude Fable 5.2 87.8 from 4 benchmarks, Gemini 3.5 Flash Lite 48.9 from 3 benchmarks.
- Widest category
- Math, 71.2 points apart on average over 4 shared benchmarks.
- Widest single gap
- FrontierMath, tier 4: Claude Fable 5.2 100.0% against Gemini 3.5 Flash Lite 0.0%, 100.0 points apart on a 0 to 100 scale.
- Output price
- Claude Fable 5.2 $40.00 against Gemini 3.5 Flash Lite $2.50 per million output tokens, 16.0x apart.
- Context window
- Claude Fable 5.2 takes 1M tokens, Gemini 3.5 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 Fable 5.2 | Bars | Gemini 3.5 Flash Lite | Ties |
|---|---|---|---|---|
| Coding | 9 | 0 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 3 | 0 | ||
| Reasoning | 8 | 0 | ||
| Math | 4 | 0 | ||
| Knowledge | 1 | 0 | ||
| General | 4 | 0 | ||
| All shared boards | 31 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index90
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| LiveBench coding | 79.2% | Not measured | Only Claude Fable 5.2 measured |
| LMArena WebDev | 1838 | 1432 | Claude Fable 5.2 |
| AA Coding Index | Not measured | 49.3 | Only Gemini 3.5 Flash Lite measured |
| LiveCodeBench (Vals AI) | Not measured | 79.0% | Only Gemini 3.5 Flash Lite measured |
| SWE-bench Verified (Vals AI) | Not measured | 75.0% | Only Gemini 3.5 Flash Lite measured |
| Terminal-Bench 4 (Vals AI) | 65.2% | Not measured | Only Claude Fable 5.2 measured |
| Vibe Code Bench (Vals AI) | 93.8% | 37.2% | Claude Fable 5.2 |
| Code migration (Vals AI) | Not measured | 6.2% | Only Gemini 3.5 Flash Lite measured |
| ProgramBench (Vals AI) | 19.0% | 0.0% | Claude Fable 5.2 |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 50.2% | Only Gemini 3.5 Flash Lite measured |
| SWE-bench Multimodal (Vals AI) | 62.3% | Not measured | Only Claude Fable 5.2 measured |
| CyberBench (Vals AI) | Not measured | 59.1% | Only Gemini 3.5 Flash Lite measured |
| SciCode | 67.7% | 41.3% | Claude Fable 5.2 |
| Terminal-Bench 4.0 (Artificial Analysis run) | 61.6% | 1.0% | Claude Fable 5.2 |
| FrontierCode 2.0 | 49.1% | 6.0% | Claude Fable 5.2 |
| FrontierSWE | 69.9% | Not measured | Only Claude Fable 5.2 measured |
| WeirdML | Not measured | 39.0% | Only Gemini 3.5 Flash Lite measured |
| ALE-Bench | 2509.8 | 765.3 | Claude Fable 5.2 |
| LMArena Text: coding | Not measured | 1453 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: software and IT | Not measured | 1450 | Only Gemini 3.5 Flash Lite measured |
| LMArena WebDev: React | 1915 | 1407 | Claude Fable 5.2 |
| LMArena WebDev: HTML | 1738 | Not measured | Only Claude Fable 5.2 measured |
| LMArena WebDev: from an image | Not measured | 1449 | Only Gemini 3.5 Flash Lite measured |
| SciCode | Not measured | 6.2% | Only Gemini 3.5 Flash Lite measured |
| GameBench 2 | 99.1 | 36.9 | Claude Fable 5.2 |
| CursorBench 4.0 | 60.0% | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 26 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| AA Intelligence Index | 64.6 | 11.7 | Claude Fable 5.2 |
| Epoch Capabilities Index | 173.4 | 145.6 | Claude Fable 5.2 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 14.3 | Only Gemini 3.5 Flash Lite measured |
| Design Arena: agents building full-stack apps | 1402 | Not measured | Only Claude Fable 5.2 measured |
| Design Arena: agents building mobile apps | 1325 | Not measured | Only Claude Fable 5.2 measured |
| Design Arena: spreadsheets | 1434 | Not measured | Only Claude Fable 5.2 measured |
| LiveBench research | 94.5% | Not measured | Only Claude Fable 5.2 measured |
| LiveBench browser | 86.9% | Not measured | Only Claude Fable 5.2 measured |
| LiveBench long agentic | 82.9% | Not measured | Only Claude Fable 5.2 measured |
| Finance Agent (Vals AI) | Not measured | 47.4% | Only Gemini 3.5 Flash Lite measured |
| Tax Agent Bench (Vals AI) | 32.1% | 7.2% | Claude Fable 5.2 |
| Legal Research Bench (Vals AI) | 46.1% | 13.9% | Claude Fable 5.2 |
| Harvey's Legal Agent Benchmark (Vals AI) | 5.0% | Not measured | Only Claude Fable 5.2 measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 43.2% | Only Gemini 3.5 Flash Lite measured |
| BioMysteryBench (Vals AI) | 83.7% | Not measured | Only Claude Fable 5.2 measured |
| Terminal-Bench-Science (Vals AI) | 55.7% | Not measured | Only Claude Fable 5.2 measured |
| Vals Science Index | 63.7% | Not measured | Only Claude Fable 5.2 measured |
| APEX-Agents | 80.1% | 29.3% | Claude Fable 5.2 |
| Remote Labor Index | 41.3% | Not measured | Only Claude Fable 5.2 measured |
| SpireClimb | 15.5% | Not measured | Only Claude Fable 5.2 measured |
| Toolathlon-Verified | Not measured | 57.1% | Only Gemini 3.5 Flash Lite measured |
| Neither model has a result on the other 25 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 83.8% | Only Gemini 3.5 Flash Lite measured |
| LiveBench reasoning | 88.8% | Not measured | Only Claude Fable 5.2 measured |
| MysteryMechanism (Vals AI) | 51.8% | Not measured | Only Claude Fable 5.2 measured |
| MMMU Pro (Vals AI) | Not measured | 83.6% | Only Gemini 3.5 Flash Lite measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 83.8% | Only Gemini 3.5 Flash Lite measured |
| Humanity's Last Exam (Artificial Analysis run) | 74.3% | 18.8% | Claude Fable 5.2 |
| HLE-Diamond (Artificial Analysis run) | 80.2% | 9.9% | Claude Fable 5.2 |
| CritPt v2, hard subset (Artificial Analysis run) | 76.5% | 3.5% | Claude Fable 5.2 |
| GPQA Diamond (Epoch AI run) | 93.9% | 83.3% | Claude Fable 5.2 |
| ARC-AGI | 98.5% | 53.5% | Claude Fable 5.2 |
| ARC-AGI-2 | 93.8% | 10.3% | Claude Fable 5.2 |
| SimpleBench | 94.9% | Not measured | Only Claude Fable 5.2 measured |
| Chess puzzles | 79.0% | 21.0% | Claude Fable 5.2 |
| Mystery game puzzles | 90.0% | 19.0% | Claude Fable 5.2 |
| EBR-bench | 90.5% | Not measured | Only Claude Fable 5.2 measured |
| LMArena Text: hard prompts | Not measured | 1441 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: expert | Not measured | 1433 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: hard prompts in English | Not measured | 1440 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: diagrams | Not measured | 1279 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: homework | Not measured | 1289 | Only Gemini 3.5 Flash Lite measured |
| Humanity's Last Exam (Scale run) | 72.4% | Not measured | Only Claude Fable 5.2 measured |
| GoBench | 2566 | Not measured | Only Claude Fable 5.2 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 Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| OTIS Mock AIME | 99.7% | 71.1% | Claude Fable 5.2 |
| FrontierMath, tiers 1 to 3 | 95.1% | 26.0% | Claude Fable 5.2 |
| FrontierMath, tier 4 | 100.0% | 0.0% | Claude Fable 5.2 |
| ProofBench | 100.0% | 13.0% | Claude Fable 5.2 |
| LMArena Text: math | Not measured | 1434 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: mathematical work | Not measured | 1431 | Only Gemini 3.5 Flash Lite measured |
| MathArena | 82.8% | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 85.8% | Only Gemini 3.5 Flash Lite measured |
| LegalBench (Vals AI) | Not measured | 84.1% | Only Gemini 3.5 Flash Lite measured |
| CorpFin (Vals AI) | Not measured | 60.7% | Only Gemini 3.5 Flash Lite measured |
| TaxEval (Vals AI) | Not measured | 72.6% | Only Gemini 3.5 Flash Lite measured |
| MortgageTax (Vals AI) | Not measured | 68.7% | Only Gemini 3.5 Flash Lite measured |
| MedCode (Vals AI) | Not measured | 43.5% | Only Gemini 3.5 Flash Lite measured |
| AA-Omniscience | 66.8 | 6.9 | Claude Fable 5.2 |
| SimpleQA Verified | 94.0% | Not measured | Only Claude Fable 5.2 measured |
| LMArena Text: science | Not measured | 1450 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: medicine and healthcare | Not measured | 1438 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: legal and government | Not measured | 1430 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: business and finance | Not measured | 1422 | Only Gemini 3.5 Flash Lite measured |
| FACTS Benchmark Suite | Not measured | 53.5% | Only Gemini 3.5 Flash Lite measured |
| PRBench Finance | 47.1% | Not measured | Only Claude Fable 5.2 measured |
| PRBench Legal | 49.0% | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 6 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| Design Arena: websites | 1351 | Not measured | Only Claude Fable 5.2 measured |
| Design Arena: UI components | 1371 | Not measured | Only Claude Fable 5.2 measured |
| Design Arena: game dev | 1396 | Not measured | Only Claude Fable 5.2 measured |
| Design Arena: 3D | 1517 | Not measured | Only Claude Fable 5.2 measured |
| Design Arena: all code categories | 1373 | Not measured | Only Claude Fable 5.2 measured |
| LiveBench design | 85.1% | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 3 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Fable 5.2 | Gemini 3.5 Flash Lite | Leader |
|---|---|---|---|
| Vals Index | 71.3% | Not measured | Only Claude Fable 5.2 measured |
| LiveBench data analysis | 81.5% | Not measured | Only Claude Fable 5.2 measured |
| Public Benefits Bench (Vals AI) | Not measured | 51.8% | Only Gemini 3.5 Flash Lite measured |
| SAGE (Vals AI) | Not measured | 79.5% | Only Gemini 3.5 Flash Lite measured |
| MedScribe (Vals AI) | Not measured | 70.9% | Only Gemini 3.5 Flash Lite measured |
| Long context reasoning (AA-LCR) | 83.3% | 76.0% | Claude Fable 5.2 |
| GDPval-AA | 1831 | 994 | Claude Fable 5.2 |
| DTBench | 99.2% | 83.5% | Claude Fable 5.2 |
| LMCA | 70.6% | 37.6% | Claude Fable 5.2 |
| Furniture assembly | 90.0% | Not measured | Only Claude Fable 5.2 measured |
| LMArena Text | Not measured | 1435 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: instruction following | Not measured | 1419 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: creative writing | Not measured | 1420 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision | Not measured | 1268 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: English | Not measured | 1438 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: non-English | Not measured | 1427 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: Chinese | Not measured | 1468 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: German | Not measured | 1452 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: Japanese | Not measured | 1426 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: Korean | Not measured | 1404 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: French | Not measured | 1448 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: Spanish | Not measured | 1441 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: Russian | Not measured | 1445 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: Polish | Not measured | 1438 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: multi-turn | Not measured | 1445 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: longer queries | Not measured | 1435 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: writing and language | Not measured | 1427 | Only Gemini 3.5 Flash Lite measured |
| LMArena Text: entertainment and media | Not measured | 1414 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: English | Not measured | 1268 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: Chinese | Not measured | 1312 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: reading text | Not measured | 1278 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: humor | Not measured | 1274 | Only Gemini 3.5 Flash Lite measured |
| LMArena Vision: creative writing | Not measured | 1255 | Only Gemini 3.5 Flash Lite measured |
| Neither model has a result on the other 16 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Fable 5.2 | Gemini 3.5 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
Gemini 3.5 Flash Lite costs less
Repository review
50K input + 3K output tokens
Gemini 3.5 Flash Lite costs less
Agent loop
200K input + 10K output tokens
Gemini 3.5 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 Fable 5.2 | Google Gemini 3.5 Flash Lite |
|---|---|---|
| Maker | Anthropic | |
| Weights | No public weights listed | No public weights listed |
| Released | November 9, 2026 | July 21, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $8.00 | $0.30 |
| Output $/Mtok | $40.00 | $2.50 |
| Coding index | 87.8 | 48.9 |
| Independent measurements behind it | 4 | 3 |
| Cost per solved task | Not computable | $0.41 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Fable 5.2 better than Gemini 3.5 Flash Lite for coding?
Pick Claude Fable 5.2 for coding: it scores 87.8 on the Vibe Coding Index against 48.9 for Gemini 3.5 Flash Lite. Pick Gemini 3.5 Flash Lite for output tokens 16.0x cheaper ($2.50 vs $40.00 per million) and a larger context window (1.05M against 1M tokens).
Which is cheaper, Claude Fable 5.2 or Gemini 3.5 Flash Lite?
Claude Fable 5.2 costs $8.00 per million input tokens and $40.00 per million output tokens; Gemini 3.5 Flash Lite costs $0.30 and $2.50. Cost per solved task is known for Gemini 3.5 Flash Lite only.
Which has the bigger context window, Claude Fable 5.2 or Gemini 3.5 Flash Lite?
Gemini 3.5 Flash Lite, with 1.05M tokens against 1M.
How many benchmarks is the Claude Fable 5.2 vs Gemini 3.5 Flash Lite comparison based on?
31 benchmarks have a result for both models as of November 14, 2026. Claude Fable 5.2's coding index rests on 4 independent benchmarks and Gemini 3.5 Flash Lite's on 3. Where only one model has a result, the page says so instead of naming a winner.