Model comparison
Claude 4 Sonnet vs DeepSeek V4 Flash (High)
Head-to-head evidence from 13 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 4 Sonnet #158 (Supported); DeepSeek V4 Flash (High) #92 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4 Sonnet and DeepSeek V4 Flash (High) share 13 comparable benchmark results. 1 of 8 categories are comparable. 3 results are unique to Claude 4 Sonnet; 25 to DeepSeek V4 Flash (High).
Updated July 23, 2026- Shared results
- 13
- Claude 4 Sonnet only
- 3
- DeepSeek V4 Flash (High) only
- 25
- Comparable categories
- 1 / 8
Pick DeepSeek V4 Flash (High) if you want the stronger benchmark profile. Claude 4 Sonnet only becomes the better choice if coding is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Confidence note. This is a partial-evidence comparison with 13 shared benchmark results across 6 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
DeepSeek V4 Flash (High) is clearly ahead on the BenchAlign aggregate, 53.95 to 42.79. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude 4 Sonnet is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $0.14 input / $0.28 output per 1M tokens for DeepSeek V4 Flash (High). That is roughly 53.6x on output cost alone. DeepSeek V4 Flash (High) is the reasoning model in the pair, while Claude 4 Sonnet is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. DeepSeek V4 Flash (High) gives you the larger context window at 1M, compared with 200K for Claude 4 Sonnet.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude 4 Sonnet | Δ | DeepSeek V4 Flash (High) |
|---|---|---|---|
| Coding | Claude 4 Sonnet72.7 | Margin← 4.2 | DeepSeek V4 Flash (High)68.5 |
| Agentic | Claude 4 SonnetNot measured | MarginNo overlap | DeepSeek V4 Flash (High)55.3 |
| Knowledge | Claude 4 SonnetNot measured | MarginNo overlap | DeepSeek V4 Flash (High)52.1 |
| Math | Claude 4 SonnetNot measured | MarginNo overlap | DeepSeek V4 Flash (High)91.9 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 72.7%B 78.6%Winner: DeepSeek V4 Flash (High)Δ 5.9SWE-bench Verified: Claude 4 Sonnet scored 72.7%; DeepSeek V4 Flash (High) scored 78.6%. DeepSeek V4 Flash (High) wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 4 Sonnet | DeepSeek V4 Flash (High) | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4 Sonnet$3 input / $15 output | DeepSeek V4 Flash (High)$0.14 input / $0.28 output | DeepSeek V4 Flash (High) has the lower combined listed price. |
| Generation speedtokens per second | Claude 4 Sonnet40 tok/s | DeepSeek V4 Flash (High)Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 4 Sonnet1.33 s | DeepSeek V4 Flash (High)Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 4 Sonnet200K | DeepSeek V4 Flash (High)1M | DeepSeek V4 Flash (High) lists the larger context window. |
Benchmark Deep Dive
Agentic11 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash (High) | Result |
|---|---|---|---|
| τ²-bench resultsSource | 52.3% | 95.6% | DeepSeek V4 Flash (High) leads |
| Gert LabsSource | 39.66% | — | Not comparable |
| JobBenchSource | 18.4% | — | Not comparable |
| Terminal-Bench 2.0Source | — | 56.6% | Not comparable |
| BrowseCompSource | — | 53.5% | Not comparable |
| HLE w/ toolsSource | — | 40.3% | Not comparable |
| MCP AtlasSource | — | 67.4% | Not comparable |
| ToolathlonSource | — | 43.5% | Not comparable |
| AA Agentic IndexSource | — | 28.2% | Not comparable |
| GDPval-AASource | — | 32.4% | Not comparable |
| GDPval-AASource | — | 1147 | Not comparable |
CodingClaude 4 Sonnet wins7 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash (High) | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 72.7% | 78.6% | DeepSeek V4 Flash (High) leads |
| AA-SciCodeSource | 37.3% | 42.0% | DeepSeek V4 Flash (High) leads |
| CodeforcesSource | — | 2816.0 | Not comparable |
| SWE-bench ProSource | — | 52.3% | Not comparable |
| SWE MultilingualSource | — | 70.2% | Not comparable |
| Terminal-Bench 2.0Source | — | 56.6% | Not comparable |
| AA Coding IndexSource | — | 52.0% | Not comparable |
Reasoning4 benchmarks
Knowledge12 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash (High) | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 25.5% | 37.5% | DeepSeek V4 Flash (High) leads |
| AA-GPQA DiamondSource | 68.3% | 86.7% | DeepSeek V4 Flash (High) leads |
| AA-HLESource | 4.0% | 27.8% | DeepSeek V4 Flash (High) leads |
| AA-Omniscience IndexSource | -9.2% | -22.3% | Claude 4 Sonnet leads |
| AA-Omniscience AccuracySource | 22.4% | 35.5% | DeepSeek V4 Flash (High) leads |
| AA-Omniscience Hallucination RateSource | 40.8% | 89.7% | Claude 4 Sonnet leads |
| MMLU-ProSource | — | 86.4% | Not comparable |
| SimpleQASource | — | 28.9% | Not comparable |
| Chinese-SimpleQASource | — | 73.2% | Not comparable |
| GPQASource | — | 87.4% | Not comparable |
| GPQA-DSource | — | 87.4% | Not comparable |
| HLESource | — | 29.4% | Not comparable |
Math4 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash (High) | Result |
|---|---|---|---|
| AA-IFBenchSource | 45.4% | 73.5% | DeepSeek V4 Flash (High) leads |
Frequently Asked Questions (2)
Which is better, Claude 4 Sonnet or DeepSeek V4 Flash (High)?
DeepSeek V4 Flash (High) is ahead on BenchLM's BenchAlign leaderboard, 53.95 to 42.79. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 72.7% and 78.6%.
Which is better for coding, Claude 4 Sonnet or DeepSeek V4 Flash (High)?
Claude 4 Sonnet has the edge for coding in this comparison, averaging 72.7 versus 68.5. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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