Model comparison
DeepSeek-V3.1-Terminus vs Gemini 3.8 Flash
Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 43.1 on the Noometry Index. DeepSeek-V3.1-Terminus costs 3.3× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.
Last verified . 15 shared benchmarks.
DeepSeek
GoogleSummary
- They share 15 benchmarks with published results for both. DeepSeek-V3.1-Terminus scores higher in 0 categories and Gemini 3.8 Flash in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 26.4.
- The biggest single-benchmark swing is LMCA: 28.6% for DeepSeek-V3.1-Terminus and 52.9% for Gemini 3.8 Flash.
- DeepSeek-V3.1-Terminus is cheaper at $0.27 / $1 per million input/output tokens, against $0.75 / $3.75 for Gemini 3.8 Flash.
- Gemini 3.8 Flash accepts more context: 1.05M tokens versus 164K.
- DeepSeek-V3.1-Terminus has downloadable open weights; the other is API-only.
Side by side
| DeepSeek-V3.1-Terminus | Gemini 3.8 Flash | |
|---|---|---|
| Provider | DeepSeek | |
| Noometry Index | 43.1 | 61.8 |
| Released | 2025-09-22 | 2026-09-02 |
| Weights | Open | Proprietary |
| Context window | 164K | 1.05M |
| Max output | 147K | 66K |
| Input $ / M tokens | $0.27 | $0.75 |
| Output $ / M tokens | $1 | $3.75 |
| Results tracked | 16 | 50 |
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Category by category
Coding Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 42.0 (#113), Gemini 3.8 Flash: 59.2 (#15)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| SciCode | 40.6% | 56.6% |
| LMArena Coding | 1426 | 1510 |
| ALE-Bench | 745.17 | 1,270 |
| DeepSWE | — | 73.8% |
| FrontierCode | — | 41.2% |
| CursorBench | — | 39.6% |
| LMArena WebDev | — | 1584 |
| FrontierSWE | — | 19.6% |
| WeirdML | — | 84.8% |
Agentic & Tool Use Not comparable
DeepSeek-V3.1-Terminus: —, Gemini 3.8 Flash: 41.8 (#21)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| APEX-Agents | — | 64.3% |
| Remote Labor Index | — | 5.8% |
| GDP.pdf | — | 23.4% |
| Vending-Bench 2 | — | 5,094 |
Reasoning Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 26.4 (#133), Gemini 3.8 Flash: 76.9 (#5)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| CritPt | 1.7% | 18.3% |
| LMArena Hard Prompts | 1426 | 1508 |
| DTBench | 81.3% | 95.7% |
| LMCA | 28.6% | 52.9% |
| ARC-AGI-2 | — | 89.2% |
| Kagi LLM Benchmark | 57.4% | — |
| NYT Connections (extended) | — | 97.4% |
| ARC-AGI-1 | — | 98.5% |
| Chess Puzzles | — | 61% |
| Mystery Game Puzzles | — | 47% |
| Surface Evolver Bench | — | 76.9% |
| Epoch Capabilities Index | — | 156.71 |
Math Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 38.5 (#137), Gemini 3.8 Flash: 65.3 (#28)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| LMArena Math | 1402 | 1528 |
| FrontierMath (Tiers 1-3) | — | 68.4% |
| FrontierMath Tier 4 | — | 22% |
| OTIS Mock AIME 2024-2025 | — | 98.9% |
| ProofBench | — | 48% |
Knowledge Not comparable
DeepSeek-V3.1-Terminus: —, Gemini 3.8 Flash: 74.8 (#2)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| GPQA Diamond | — | 95.4% |
| Humanity's Last Exam | — | 44.5% |
| SimpleQA Verified | — | 69.7% |
| LMArena Expert | — | 1524 |
Multimodal Not comparable
DeepSeek-V3.1-Terminus: —, Gemini 3.8 Flash: 40.7 (#45)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| LMArena Vision | — | 1314 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 31.7% |
Multilingual Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 52.1 (#92), Gemini 3.8 Flash: 58.0 (#5)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| LMArena Non-English | 1407 | 1491 |
| LMArena Russian | 1436 | 1515 |
| LMArena Chinese | — | 1554 |
| LMArena French | — | 1498 |
| LMArena German | — | 1493 |
| LMArena Japanese | — | 1502 |
| LMArena Korean | — | 1459 |
| LMArena Spanish | — | 1485 |
Instruction Following Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 74.0 (#106), Gemini 3.8 Flash: 78.0 (#13)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| LMArena Instruction Following | 1404 | 1490 |
Long Context Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 43.4 (#97), Gemini 3.8 Flash: 46.3 (#24)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| LMArena Longer Query | 1421 | 1508 |
Writing & Preference Gemini 3.8 Flash leads
DeepSeek-V3.1-Terminus: 61.0 (#92), Gemini 3.8 Flash: 72.2 (#15)
| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.8 Flash |
|---|---|---|
| LMArena Text | 1419 | 1499 |
| LMArena Creative Writing | 1403 | 1492 |
| LMArena Multi-Turn | 1411 | 1501 |
| EQ-Bench Creative Writing | — | 1748 |
Frequently asked questions
Is DeepSeek-V3.1-Terminus better than Gemini 3.8 Flash?
Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 43.1 on the Noometry Index. DeepSeek-V3.1-Terminus costs 3.3× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.
Which is cheaper, DeepSeek-V3.1-Terminus or Gemini 3.8 Flash?
DeepSeek-V3.1-Terminus is cheaper. It lists at $0.27 per million input tokens and $1 per million output tokens; Gemini 3.8 Flash lists at $0.75 and $3.75.
Is DeepSeek-V3.1-Terminus or Gemini 3.8 Flash better for coding?
Gemini 3.8 Flash scores higher on coding benchmarks: 59.2 versus 42.0 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.8 Flash does, with 1.05M tokens against 164K.
How many benchmarks do DeepSeek-V3.1-Terminus and Gemini 3.8 Flash share?
15 benchmarks have published results for both models. DeepSeek-V3.1-Terminus has 16 scored results on Noometry and Gemini 3.8 Flash has 50.