DeepSeek V3.1 Terminus vs Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads DeepSeek V3.1 Terminus on the Artificial Analysis Intelligence Index, 15.6 to 14.8, and DeepSeek V3.1 Terminus costs 1.5x less per output token ($1.0142 vs $1.50 per million). Updated October 22, 2026; 31 benchmarks have a result for both.
DeepSeek V3.1 Terminus or Gemini 3.1 Flash Lite Preview: which to pick
Only Gemini 3.1 Flash Lite Preview has a coding score, 22.7 on the Vibe Coding Index; DeepSeek V3.1 Terminus has none, so the two cannot be ranked on coding.
Pick DeepSeek V3.1 Terminus for output tokens 1.5x cheaper ($1.0142 vs $1.50 per million) and work measured by AA Coding Index or LMArena Text: coding, where it leads.
- Shared results
- 31
- DeepSeek V3.1 Terminus only
- 14
- Gemini 3.1 Flash Lite Preview only
- 48
- 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
No call
Only Gemini 3.1 Flash Lite Preview has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 15.6 against 14.8.
Same board, both measured
Agentic work
AA Agentic Index
DeepSeek V3.1 Terminus
DeepSeek V3.1 Terminus leads, 6.8 against 1.6.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Gemini 3.1 Flash Lite Preview has a GPQA Diamond result, 81.1%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Flash Lite Preview has a MMLU Pro result, 86.2%.
Directional only
Web design
Design Arena: websites
DeepSeek V3.1 Terminus
DeepSeek V3.1 Terminus leads, 1187 against 1082.
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 164K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
DeepSeek V3.1 Terminus
DeepSeek V3.1 Terminus $0.0008, Gemini 3.1 Flash Lite Preview $0.0010 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Flash Lite Preview has the number, $0.18.
Directional only
At a glance
- Coding index
- DeepSeek V3.1 Terminus not benchmarked, Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks.
- Widest category
- Web design, 11.7 points apart on average over 7 shared benchmarks.
- Widest single gap
- Design Arena: data viz: DeepSeek V3.1 Terminus 1168 against Gemini 3.1 Flash Lite Preview 1045, 15.4 points apart on a 0 to 100 scale.
- Output price
- DeepSeek V3.1 Terminus $1.0142 against Gemini 3.1 Flash Lite Preview $1.50 per million output tokens, 1.5x apart.
- Context window
- DeepSeek V3.1 Terminus takes 164K 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 | DeepSeek V3.1 Terminus | Bars | Gemini 3.1 Flash Lite Preview | Ties |
|---|---|---|---|---|
| Coding | 3 | 1 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 1 | 0 | ||
| Reasoning | 2 | 0 | ||
| Math | 0 | 1 | ||
| Knowledge | 4 | 0 | ||
| Web design | 7 | 0 | ||
| General | 8 | 3 | ||
| All shared boards | 25 | 6 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index31
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1257 | Only Gemini 3.1 Flash Lite Preview measured |
| AA Coding Index | 43.5 | 34.7 | DeepSeek V3.1 Terminus |
| LiveCodeBench (Vals AI) | Not measured | 80.1% | Only Gemini 3.1 Flash Lite Preview measured |
| SWE-bench Verified (Vals AI) | Not measured | 62.8% | Only Gemini 3.1 Flash Lite Preview measured |
| Vibe Code Bench (Vals AI) | Not measured | 0.0% | Only Gemini 3.1 Flash Lite Preview measured |
| 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) | 79.8% | Not measured | Only DeepSeek V3.1 Terminus measured |
| SciCode | 38.0% | Not measured | Only DeepSeek V3.1 Terminus measured |
| Terminal-Bench Hard (Artificial Analysis run) | 31.8% | Not measured | Only DeepSeek V3.1 Terminus measured |
| ALE-Bench | 745.2 | 797.7 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: coding | 1425 | 1400 | DeepSeek V3.1 Terminus |
| LMArena Text: software and IT | 1426 | 1413 | DeepSeek V3.1 Terminus |
| LMArena WebDev: React | Not measured | 1245 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena WebDev: HTML | Not measured | 1276 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena WebDev: from an image | Not measured | 1336 | Only Gemini 3.1 Flash Lite Preview measured |
| SciCode | Not measured | 4.6% | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 21 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| AA Intelligence Index | 14.8 | 15.6 | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| AA Agentic Index | 6.8 | 1.6 | DeepSeek V3.1 Terminus |
| 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 | 37.1% | Not measured | Only DeepSeek V3.1 Terminus measured |
| Neither model has a result on the other 35 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 81.1% | Only Gemini 3.1 Flash Lite Preview measured |
| MMMU Pro (Vals AI) | Not measured | 82.5% | Only Gemini 3.1 Flash Lite Preview measured |
| GPQA Diamond (Artificial Analysis run) | 79.2% | Not measured | Only DeepSeek V3.1 Terminus measured |
| Humanity's Last Exam (Artificial Analysis run) | 16.4% | Not measured | Only DeepSeek V3.1 Terminus measured |
| LMArena Text: hard prompts | 1426 | 1407 | DeepSeek V3.1 Terminus |
| LMArena Text: expert | Not measured | 1398 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: hard prompts in English | 1432 | 1403 | DeepSeek V3.1 Terminus |
| 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 |
| Kagi LLM Benchmark | 57.4% | Not measured | Only DeepSeek V3.1 Terminus measured |
| Neither model has a result on the other 12 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| AIME | Not measured | 83.3% | Only Gemini 3.1 Flash Lite Preview measured |
| AA Math Index | 89.7 | Not measured | Only DeepSeek V3.1 Terminus measured |
| AIME 2025 (Artificial Analysis run) | 89.7% | Not measured | Only DeepSeek V3.1 Terminus measured |
| LMArena Text: math | 1402 | 1428 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: mathematical work | Not measured | 1417 | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 8 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 86.2% | Only Gemini 3.1 Flash Lite Preview measured |
| LegalBench (Vals AI) | Not measured | 83.8% | Only Gemini 3.1 Flash Lite Preview measured |
| CaseLaw (Vals AI) | Not measured | 55.0% | Only Gemini 3.1 Flash Lite Preview measured |
| CorpFin (Vals AI) | Not measured | 59.4% | Only Gemini 3.1 Flash Lite Preview measured |
| TaxEval (Vals AI) | Not measured | 71.8% | Only Gemini 3.1 Flash Lite Preview measured |
| MortgageTax (Vals AI) | Not measured | 68.0% | Only Gemini 3.1 Flash Lite Preview measured |
| MedCode (Vals AI) | Not measured | 47.6% | Only Gemini 3.1 Flash Lite Preview measured |
| MMLU Pro (Artificial Analysis run) | 85.1% | Not measured | Only DeepSeek V3.1 Terminus measured |
| LMArena Text: science | 1451 | 1425 | DeepSeek V3.1 Terminus |
| LMArena Text: medicine and healthcare | 1468 | 1428 | DeepSeek V3.1 Terminus |
| LMArena Text: legal and government | 1457 | 1418 | DeepSeek V3.1 Terminus |
| LMArena Text: business and finance | 1414 | 1389 | DeepSeek V3.1 Terminus |
| FACTS Benchmark Suite | Not measured | 51.4% | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 5 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index70
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| Design Arena: websites | 1187 | 1082 | DeepSeek V3.1 Terminus |
| Design Arena: UI components | 1182 | 1069 | DeepSeek V3.1 Terminus |
| Design Arena: game dev | 1131 | 1029 | DeepSeek V3.1 Terminus |
| Design Arena: data viz | 1168 | 1045 | DeepSeek V3.1 Terminus |
| Design Arena: 3D | 1141 | 1047 | DeepSeek V3.1 Terminus |
| Design Arena: all code categories | 1175 | 1072 | DeepSeek V3.1 Terminus |
| Design Arena: SVG | 1065 | 1052 | DeepSeek V3.1 Terminus |
| Design Arena: ASCII art | Not measured | 1167 | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index83
| Benchmark | DeepSeek V3.1 Terminus | Gemini 3.1 Flash Lite Preview | Leader |
|---|---|---|---|
| SAGE (Vals AI) | Not measured | 49.5% | Only Gemini 3.1 Flash Lite Preview measured |
| MedScribe (Vals AI) | Not measured | 63.9% | Only Gemini 3.1 Flash Lite Preview measured |
| Vals Multimodal Index | Not measured | 41.4% | Only Gemini 3.1 Flash Lite Preview measured |
| IFBench | 57.0% | Not measured | Only DeepSeek V3.1 Terminus measured |
| Long context reasoning (AA-LCR) | 69.3% | Not measured | Only DeepSeek V3.1 Terminus measured |
| DTBench | 81.3% | Not measured | Only DeepSeek V3.1 Terminus measured |
| LMCA | 28.6% | Not measured | Only DeepSeek V3.1 Terminus measured |
| LMArena Text | 1419 | 1416 | DeepSeek V3.1 Terminus |
| LMArena Text: instruction following | 1404 | 1377 | DeepSeek V3.1 Terminus |
| LMArena Text: creative writing | 1403 | 1401 | DeepSeek V3.1 Terminus |
| LMArena Vision | Not measured | 1240 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: English | 1429 | 1414 | DeepSeek V3.1 Terminus |
| LMArena Text: non-English | 1408 | 1410 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Chinese | Not measured | 1460 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: German | Not measured | 1430 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: Japanese | Not measured | 1413 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: Korean | Not measured | 1392 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: French | Not measured | 1424 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: Spanish | Not measured | 1421 | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: Russian | 1435 | 1420 | DeepSeek V3.1 Terminus |
| LMArena Text: Polish | 1427 | 1443 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: multi-turn | 1411 | 1417 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: longer queries | 1422 | 1394 | DeepSeek V3.1 Terminus |
| LMArena Text: writing and language | 1409 | 1408 | DeepSeek V3.1 Terminus |
| LMArena Text: entertainment and media | 1391 | 1386 | DeepSeek V3.1 Terminus |
| 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 |
| Neither model has a result on the other 14 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | DeepSeek V3.1 Terminus | 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
DeepSeek V3.1 Terminus 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 | DeepSeek V3.1 Terminus | Google Gemini 3.1 Flash Lite Preview |
|---|---|---|
| Maker | DeepSeek | |
| Weights | Open weights | No public weights listed |
| Released | September 22, 2025 | March 3, 2026 |
| Context window | 164K | 1.05M |
| Input $/Mtok | $0.3063 | $0.25 |
| Output $/Mtok | $1.0142 | $1.50 |
| Coding index | Not benchmarked | 22.7 |
| Independent measurements behind it | 0 | 3 |
| Cost per solved task | Not computable | $0.18 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is DeepSeek V3.1 Terminus better than Gemini 3.1 Flash Lite Preview for coding?
Only Gemini 3.1 Flash Lite Preview has a coding score, 22.7 on the Vibe Coding Index; DeepSeek V3.1 Terminus has none, so the two cannot be ranked on coding. Pick DeepSeek V3.1 Terminus for output tokens 1.5x cheaper ($1.0142 vs $1.50 per million) and work measured by AA Coding Index or LMArena Text: coding, where it leads.
Which is cheaper, DeepSeek V3.1 Terminus or Gemini 3.1 Flash Lite Preview?
DeepSeek V3.1 Terminus costs $0.3063 per million input tokens and $1.0142 per million output tokens; Gemini 3.1 Flash Lite Preview costs $0.25 and $1.50. Cost per solved task is known for Gemini 3.1 Flash Lite Preview only.
Which has the bigger context window, DeepSeek V3.1 Terminus or Gemini 3.1 Flash Lite Preview?
Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 164K.
How many benchmarks is the DeepSeek V3.1 Terminus vs Gemini 3.1 Flash Lite Preview comparison based on?
31 benchmarks have a result for both models as of October 22, 2026. DeepSeek V3.1 Terminus's coding index rests on 0 independent benchmarks and Gemini 3.1 Flash Lite Preview's on 3. Where only one model has a result, the page says so instead of naming a winner.