Model comparison
DeepSeek V4 Pro vs GPT-5.5 Instant
DeepSeek V4 Pro is the stronger model overall, scoring 54.2 to 42.5 on the Noometry Index.
Last verified . 25 shared benchmarks.
DeepSeekSummary
- They share 25 benchmarks with published results for both. DeepSeek V4 Pro scores higher in 8 categories and GPT-5.5 Instant in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where DeepSeek V4 Pro leads 64.6 to 26.1.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 64.6% for DeepSeek V4 Pro and 26.3% for GPT-5.5 Instant.
- DeepSeek V4 Pro has downloadable open weights; the other is API-only.
Side by side
| DeepSeek V4 Pro | GPT-5.5 Instant | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 54.2 | 42.5 |
| Released | 2026-04-24 | 2026-05-05 |
| Weights | Open | Proprietary |
| Context window | 1M | — |
| Max output | 393K | — |
| Input $ / M tokens | $0.43 | — |
| Output $ / M tokens | $0.87 | — |
| Results tracked | 48 | 27 |
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Category by category
Coding DeepSeek V4 Pro leads
DeepSeek V4 Pro: 52.2 (#31), GPT-5.5 Instant: 43.7 (#73)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| SciCode | 51% | 48.6% |
| LMArena Coding | 1470 | 1433 |
| SWE-bench Verified | 77.6% | — |
| FrontierCode | 28.6% | — |
| LMArena WebDev | 1582 | — |
| WeirdML | 66.2% | — |
| ALE-Bench | 1,403 | — |
Agentic & Tool Use Not comparable
DeepSeek V4 Pro: 32.7 (#54), GPT-5.5 Instant: —
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| APEX-Agents | 47.3% | — |
| Vending-Bench 2 | 3,285 | — |
Reasoning DeepSeek V4 Pro leads
DeepSeek V4 Pro: 56.4 (#22), GPT-5.5 Instant: 24.2 (#149)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| CritPt | 18% | 0% |
| Chess Puzzles | 47% | 12% |
| LMArena Hard Prompts | 1461 | 1426 |
| Epoch Capabilities Index | 155.39 | 142.48 |
| ARC-AGI-2 | 61.3% | — |
| Kagi LLM Benchmark | 53.5% | — |
| NYT Connections (extended) | 91.3% | — |
| ARC-AGI-1 | 90.5% | — |
| Mystery Game Puzzles | 43% | — |
| DTBench | 93.9% | — |
| LMCA | 45.5% | — |
| Surface Evolver Bench | 40% | — |
| ForecastBench | 56.1 | — |
Math DeepSeek V4 Pro leads
DeepSeek V4 Pro: 64.6 (#24), GPT-5.5 Instant: 26.1 (#241)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| FrontierMath (Tiers 1-3) | 64.6% | 26.3% |
| FrontierMath Tier 4 | 26.8% | 2.4% |
| OTIS Mock AIME 2024-2025 | 98.6% | 68.1% |
| LMArena Math | 1455 | 1420 |
| MathArena Final-Answer Competitions | 76.6% | — |
| ProofBench | 50% | — |
Knowledge DeepSeek V4 Pro leads
DeepSeek V4 Pro: 59.5 (#28), GPT-5.5 Instant: 48.9 (#68)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| GPQA Diamond | 91.7% | 82.5% |
| LMArena Expert | 1463 | 1409 |
| SimpleQA Verified | 52.9% | — |
| Vectara Hallucination Rate | 8.6% | — |
Multimodal Not comparable
DeepSeek V4 Pro: —, GPT-5.5 Instant: 39.3 (#48)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | — | 1250 |
| LMArena Document | — | 1403 |
Multilingual DeepSeek V4 Pro leads
DeepSeek V4 Pro: 54.5 (#44), GPT-5.5 Instant: 53.0 (#76)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1438 | 1417 |
| LMArena Chinese | 1486 | 1457 |
| LMArena French | 1473 | 1428 |
| LMArena German | 1458 | 1410 |
| LMArena Japanese | 1448 | 1408 |
| LMArena Korean | 1452 | 1393 |
| LMArena Russian | 1452 | 1430 |
| LMArena Spanish | 1457 | 1430 |
Instruction Following DeepSeek V4 Pro leads
DeepSeek V4 Pro: 76.3 (#44), GPT-5.5 Instant: 74.4 (#94)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1448 | 1407 |
Long Context DeepSeek V4 Pro leads
DeepSeek V4 Pro: 45.0 (#49), GPT-5.5 Instant: 43.4 (#92)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1459 | 1422 |
| CL-bench Life | 13.5% | — |
Writing & Preference DeepSeek V4 Pro leads
DeepSeek V4 Pro: 65.6 (#45), GPT-5.5 Instant: 62.0 (#81)
| Benchmark | DeepSeek V4 Pro | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1451 | 1419 |
| LMArena Creative Writing | 1446 | 1420 |
| LMArena Multi-Turn | 1467 | 1434 |
| EQ-Bench Creative Writing | 1553 | — |
| EQ-Bench 4 | 1166 | — |
Frequently asked questions
Is DeepSeek V4 Pro better than GPT-5.5 Instant?
DeepSeek V4 Pro is the stronger model overall, scoring 54.2 to 42.5 on the Noometry Index.
Is DeepSeek V4 Pro or GPT-5.5 Instant better for coding?
DeepSeek V4 Pro scores higher on coding benchmarks: 52.2 versus 43.7 in the Noometry coding category.
How many benchmarks do DeepSeek V4 Pro and GPT-5.5 Instant share?
25 benchmarks have published results for both models. DeepSeek V4 Pro has 48 scored results on Noometry and GPT-5.5 Instant has 27.