Model comparison
Claude Sonnet 4.5 vs DeepSeek V4 Pro Base
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Sonnet 4.5 #96 (Estimated); DeepSeek V4 Pro Base unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Sonnet 4.5 and DeepSeek V4 Pro Base share 0 comparable benchmark results. 2 of 8 categories are comparable. 12 results are unique to Claude Sonnet 4.5; 24 to DeepSeek V4 Pro Base.
Updated July 23, 2026- Shared results
- 0
- Claude Sonnet 4.5 only
- 12
- DeepSeek V4 Pro Base only
- 24
- Comparable categories
- 2 / 8
Treat this as a split decision. Claude Sonnet 4.5 makes more sense if knowledge is the priority; DeepSeek V4 Pro Base is the better fit if reasoning is the priority or you need the larger 1M context window.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Sonnet 4.5 and DeepSeek V4 Pro Base finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
DeepSeek V4 Pro Base gives you the larger context window at 1M, compared with 200K for Claude Sonnet 4.5.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Sonnet 4.5 | DeepSeek V4 Pro Base | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Sonnet 4.5$3 input / $15 output | DeepSeek V4 Pro BaseNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Claude Sonnet 4.5Not available | DeepSeek V4 Pro BaseNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Sonnet 4.5Not available | DeepSeek V4 Pro BaseNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Sonnet 4.5200K | DeepSeek V4 Pro Base1M | DeepSeek V4 Pro Base lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding3 benchmarks
ReasoningDeepSeek V4 Pro Base wins7 benchmarks
KnowledgeClaude Sonnet 4.5 wins13 benchmarks
| Benchmark | Claude Sonnet 4.5 | DeepSeek V4 Pro Base | Result |
|---|---|---|---|
| GPQASource | 83.4% | — | Not comparable |
| AGIEvalSource | — | 83.1% | Not comparable |
| MMLUSource | — | 90.1% | Not comparable |
| MMLU-ReduxSource | — | 90.8% | Not comparable |
| MMLU-ProSource | — | 73.5% | Not comparable |
| MMMLUSource | — | 90.3% | Not comparable |
| C-EvalSource | — | 93.1% | Not comparable |
| CMMLUSource | — | 90.8% | Not comparable |
| MultiLoKoSource | — | 51.1% | Not comparable |
| SimpleQASource | — | 55.2% | Not comparable |
| SuperGPQASource | — | 53.9% | Not comparable |
| FACTS ParametricSource | — | 62.6% | Not comparable |
| TriviaQASource | — | 85.6% | Not comparable |
Math6 benchmarks
Multilingual1 benchmarks
| Benchmark | Claude Sonnet 4.5 | DeepSeek V4 Pro Base | Result |
|---|---|---|---|
| MGSMSource | — | 84.4% | Not comparable |
Multimodal1 benchmarks
| Benchmark | Claude Sonnet 4.5 | DeepSeek V4 Pro Base | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1219 | — | Not comparable |
Frequently Asked Questions (3)
Which is better, Claude Sonnet 4.5 or DeepSeek V4 Pro Base?
Claude Sonnet 4.5 and DeepSeek V4 Pro Base are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for knowledge tasks, Claude Sonnet 4.5 or DeepSeek V4 Pro Base?
Claude Sonnet 4.5 has the edge for knowledge tasks in this comparison, averaging 83.4 versus 66.4. DeepSeek V4 Pro Base stays close enough that the answer can still flip depending on your workload.
Which is better for reasoning, Claude Sonnet 4.5 or DeepSeek V4 Pro Base?
DeepSeek V4 Pro Base has the edge for reasoning in this comparison, averaging 51.5 versus 13.6. Claude Sonnet 4.5 stays close enough that the answer can still flip depending on your workload.
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