Model comparison
DeepSeek V4.1 Flash vs GPT-5 Mini
DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 41.7 on the Noometry Index.
Last verified . 22 shared benchmarks.
DeepSeekSummary
- They share 22 benchmarks with published results for both. DeepSeek V4.1 Flash scores higher in 7 categories and GPT-5 Mini in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where DeepSeek V4.1 Flash leads 46.2 to 24.1.
- The biggest single-benchmark swing is ProofBench: 54% for DeepSeek V4.1 Flash and 9% for GPT-5 Mini.
- DeepSeek V4.1 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $0.25 / $2 for GPT-5 Mini.
- DeepSeek V4.1 Flash accepts more context: 1M tokens versus 400K.
- DeepSeek V4.1 Flash has downloadable open weights; the other is API-only.
Side by side
| DeepSeek V4.1 Flash | GPT-5 Mini | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 50.3 | 41.7 |
| Released | 2026-09-09 | 2025-08-07 |
| Weights | Open | Proprietary |
| Context window | 1M | 400K |
| Max output | 393K | 128K |
| Input $ / M tokens | $0.15 | $0.25 |
| Output $ / M tokens | $0.60 | $2 |
| Results tracked | 25 | 60 |
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Category by category
Coding DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 52.8 (#29), GPT-5 Mini: 40.0 (#134)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| SciCode | 51.9% | 39.2% |
| LMArena Coding | 1511 | 1406 |
| ALE-Bench | 1,092 | 799.77 |
| SWE-bench Verified | — | 64.7% |
| SWE-bench Verified (bash only) | — | 59.8% |
| LMArena WebDev | 1620 | — |
| SWE-bench Multilingual | — | 39.7% |
| WeirdML | — | 52.7% |
| AlgoTune | — | 1.38 |
Agentic & Tool Use Not comparable
DeepSeek V4.1 Flash: —, GPT-5 Mini: 31.0 (#64)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| Terminal-Bench | — | 34.8% |
| Berkeley Function Calling Leaderboard | — | 55.5% |
| Vending-Bench 2 | — | -31.18 |
Reasoning DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 46.2 (#39), GPT-5 Mini: 24.1 (#153)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| CritPt | 14.3% | 0% |
| LMArena Hard Prompts | 1485 | 1380 |
| DTBench | 89.9% | 80.5% |
| LMCA | 47% | 34.2% |
| Epoch Capabilities Index | 155.01 | 145.51 |
| ARC-AGI-2 | — | 4.4% |
| Kagi LLM Benchmark | — | 70.3% |
| NYT Connections (extended) | 89.6% | — |
| ARC-AGI-1 | — | 54.3% |
| Chess Puzzles | — | 30% |
| EnigmaEval | — | 8.2% |
| Mystery Game Puzzles | — | 10% |
| Surface Evolver Bench | 46.3% | — |
| ForecastBench | — | 61 |
Math DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 48.4 (#52), GPT-5 Mini: 46.3 (#59)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| ProofBench | 54% | 9% |
| LMArena Math | 1493 | 1377 |
| FrontierMath (Tiers 1-3) | — | 46.7% |
| FrontierMath Tier 4 | — | 12.2% |
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| Omni-MATH | — | 72.2% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 27.2% |
| FrontierMath Tier 4 (v1) | — | 6.3% |
Knowledge GPT-5 Mini leads
DeepSeek V4.1 Flash: 41.6 (#97), GPT-5 Mini: 45.5 (#80)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| LMArena Expert | 1505 | 1377 |
| GPQA Diamond | — | 75% |
| Humanity's Last Exam | — | 19.4% |
| SimpleQA Verified | — | 21.6% |
| MMLU-Pro | — | 83.5% |
| Confabulations | — | 13.3% |
| Vectara Hallucination Rate | — | 12.9% |
| GPQA (HELM) | — | 75.6% |
Multimodal Not comparable
DeepSeek V4.1 Flash: —, GPT-5 Mini: 35.0 (#80)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| LMArena Vision | — | 1202 |
| VPCT | — | 40.2% |
Multilingual DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 55.5 (#29), GPT-5 Mini: 49.1 (#131)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| LMArena Non-English | 1452 | 1363 |
| LMArena Chinese | 1506 | 1387 |
| LMArena French | 1448 | 1385 |
| LMArena Russian | 1473 | 1362 |
| LMArena Spanish | 1499 | 1355 |
| LMArena German | — | 1366 |
| LMArena Japanese | — | 1342 |
| LMArena Korean | — | 1306 |
Instruction Following DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 77.6 (#24), GPT-5 Mini: 76.4 (#43)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| LMArena Instruction Following | 1475 | 1357 |
| IFEval | — | 92.7% |
Long Context DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 45.2 (#46), GPT-5 Mini: 41.9 (#127)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| LMArena Longer Query | 1476 | 1355 |
| Fiction.LiveBench | — | 69.4% |
Writing & Preference DeepSeek V4.1 Flash leads
DeepSeek V4.1 Flash: 65.8 (#43), GPT-5 Mini: 55.4 (#143)
| Benchmark | DeepSeek V4.1 Flash | GPT-5 Mini |
|---|---|---|
| LMArena Text | 1465 | 1373 |
| LMArena Creative Writing | 1436 | 1325 |
| EQ-Bench Creative Writing | 1540 | 1313 |
| LMArena Multi-Turn | 1460 | 1363 |
| Short-Story Creative Writing | — | 83.1% |
| WildBench | — | 85.5% |
Frequently asked questions
Is DeepSeek V4.1 Flash better than GPT-5 Mini?
DeepSeek V4.1 Flash is the stronger model overall, scoring 50.3 to 41.7 on the Noometry Index.
Which is cheaper, DeepSeek V4.1 Flash or GPT-5 Mini?
DeepSeek V4.1 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; GPT-5 Mini lists at $0.25 and $2.
Is DeepSeek V4.1 Flash or GPT-5 Mini better for coding?
DeepSeek V4.1 Flash scores higher on coding benchmarks: 52.8 versus 40.0 in the Noometry coding category.
Which has the bigger context window?
DeepSeek V4.1 Flash does, with 1M tokens against 400K.
How many benchmarks do DeepSeek V4.1 Flash and GPT-5 Mini share?
22 benchmarks have published results for both models. DeepSeek V4.1 Flash has 25 scored results on Noometry and GPT-5 Mini has 60.