Model comparison
Claude Sonnet 5.5 vs DeepSeek-V2.5 (Sep 2024)
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 37.0 on the Noometry Index.
Last verified . 0 shared benchmarks.
DeepSeekSummary
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 33.3.
- DeepSeek-V2.5 (Sep 2024) has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) | |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Noometry Index | 60.5 | 37.0 |
| Released | 2026-09-28 | 2024-09-06 |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 16 | 22 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 65.5 (#6), DeepSeek-V2.5 (Sep 2024): 31.3 (#274)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| FrontierCode | 52.1% | — |
| Aider Polyglot | — | 17.8% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| BigCodeBench Instruct | — | 48.6% |
| LMArena Coding | — | 1310 |
| BigCodeBench Complete | — | 53.2% |
| ALE-Bench | 1,819 | — |
| HumanEval+ | — | 83.5% |
| MBPP+ | — | 74.1% |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 44.9 (#14), DeepSeek-V2.5 (Sep 2024): —
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 52.4 (#29), DeepSeek-V2.5 (Sep 2024): 24.5 (#145)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| CritPt | 31.4% | — |
| LMArena Hard Prompts | — | 1289 |
| Mystery Game Puzzles | 65% | — |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 88.7 (#4), DeepSeek-V2.5 (Sep 2024): 33.3 (#177)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | — | 1289 |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#11), DeepSeek-V2.5 (Sep 2024): 34.2 (#190)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
| LMArena Expert | — | 1266 |
Multimodal Not comparable
Claude Sonnet 5.5: 53.2 (#5), DeepSeek-V2.5 (Sep 2024): —
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| Furniture Assembly | 75% | — |
Multilingual Not comparable
Claude Sonnet 5.5: —, DeepSeek-V2.5 (Sep 2024): 42.7 (#188)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Non-English | — | 1273 |
| LMArena Chinese | — | 1317 |
| LMArena French | — | 1288 |
| LMArena German | — | 1258 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1209 |
| LMArena Russian | — | 1289 |
| LMArena Spanish | — | 1248 |
Instruction Following Not comparable
Claude Sonnet 5.5: —, DeepSeek-V2.5 (Sep 2024): 67.7 (#189)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Instruction Following | — | 1280 |
Long Context Not comparable
Claude Sonnet 5.5: —, DeepSeek-V2.5 (Sep 2024): 39.5 (#169)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Longer Query | — | 1301 |
Writing & Preference Not comparable
Claude Sonnet 5.5: —, DeepSeek-V2.5 (Sep 2024): 50.0 (#182)
| Benchmark | Claude Sonnet 5.5 | DeepSeek-V2.5 (Sep 2024) |
|---|---|---|
| LMArena Text | — | 1294 |
| LMArena Creative Writing | — | 1285 |
| LMArena Multi-Turn | — | 1297 |
Frequently asked questions
Is Claude Sonnet 5.5 better than DeepSeek-V2.5 (Sep 2024)?
Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 37.0 on the Noometry Index.
Is Claude Sonnet 5.5 or DeepSeek-V2.5 (Sep 2024) better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 31.3 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and DeepSeek-V2.5 (Sep 2024) share?
0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and DeepSeek-V2.5 (Sep 2024) has 22.