Model comparison
Claude 3.5 Sonnet vs DeepSeek V4 Flash 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 3.5 Sonnet #132 (Estimated); DeepSeek V4 Flash Base unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 3.5 Sonnet and DeepSeek V4 Flash Base share 0 comparable benchmark results. 1 of 8 categories are comparable. 4 results are unique to Claude 3.5 Sonnet; 24 to DeepSeek V4 Flash Base.
Updated July 23, 2026- Shared results
- 0
- Claude 3.5 Sonnet only
- 4
- DeepSeek V4 Flash Base only
- 24
- Comparable categories
- 1 / 8
Treat this as a split decision. Claude 3.5 Sonnet makes more sense if knowledge is the priority; DeepSeek V4 Flash Base is the better fit if you need the larger 1M context window.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude 3.5 Sonnet and DeepSeek V4 Flash 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 Flash Base gives you the larger context window at 1M, compared with 200K for Claude 3.5 Sonnet.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 3.5 Sonnet | DeepSeek V4 Flash Base | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 3.5 Sonnet$3 input / $15 output | DeepSeek V4 Flash BaseNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Claude 3.5 SonnetNot available | DeepSeek V4 Flash BaseNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 3.5 SonnetNot available | DeepSeek V4 Flash BaseNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 3.5 Sonnet200K | DeepSeek V4 Flash Base1M | DeepSeek V4 Flash Base lists the larger context window. |
Benchmark Deep Dive
Coding3 benchmarks
Reasoning6 benchmarks
KnowledgeClaude 3.5 Sonnet wins13 benchmarks
| Benchmark | Claude 3.5 Sonnet | DeepSeek V4 Flash Base | Result |
|---|---|---|---|
| GPQASource | 59.4% | — | Not comparable |
| AGIEvalSource | — | 82.6% | Not comparable |
| MMLUSource | — | 88.7% | Not comparable |
| MMLU-ReduxSource | — | 89.4% | Not comparable |
| MMLU-ProSource | — | 68.3% | Not comparable |
| MMMLUSource | — | 88.8% | Not comparable |
| C-EvalSource | — | 92.1% | Not comparable |
| CMMLUSource | — | 90.4% | Not comparable |
| MultiLoKoSource | — | 42.2% | Not comparable |
| SimpleQASource | — | 30.1% | Not comparable |
| SuperGPQASource | — | 46.5% | Not comparable |
| FACTS ParametricSource | — | 33.9% | Not comparable |
| TriviaQASource | — | 82.8% | Not comparable |
Math5 benchmarks
Multilingual1 benchmarks
| Benchmark | Claude 3.5 Sonnet | DeepSeek V4 Flash Base | Result |
|---|---|---|---|
| MGSMSource | — | 85.7% | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude 3.5 Sonnet or DeepSeek V4 Flash Base?
Claude 3.5 Sonnet and DeepSeek V4 Flash 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 3.5 Sonnet or DeepSeek V4 Flash Base?
Claude 3.5 Sonnet has the edge for knowledge tasks in this comparison, averaging 59.4 versus 56.4. DeepSeek V4 Flash Base stays close enough that the answer can still flip depending on your workload.
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