Model comparison
Claude 4 Sonnet vs DeepSeek V4 Flash
Head-to-head evidence from 3 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 4 Sonnet #158 (Supported); DeepSeek V4 Flash #61 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4 Sonnet and DeepSeek V4 Flash share 3 comparable benchmark results. 1 of 8 categories are comparable. 13 results are unique to Claude 4 Sonnet; 19 to DeepSeek V4 Flash.
Updated July 23, 2026- Shared results
- 3
- Claude 4 Sonnet only
- 13
- DeepSeek V4 Flash only
- 19
- Comparable categories
- 1 / 8
Pick DeepSeek V4 Flash if you want the stronger benchmark profile. Claude 4 Sonnet only becomes the better choice if coding is the priority.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 3 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 is clearly ahead on the BenchAlign aggregate, 58.88 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. That is roughly 53.6x on output cost alone. DeepSeek V4 Flash 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 |
|---|---|---|---|
| Coding | Claude 4 Sonnet72.7 | Margin← 8.5 | DeepSeek V4 Flash64.2 |
| Agentic | Claude 4 SonnetNot measured | MarginNo overlap | DeepSeek V4 Flash49.1 |
| Knowledge | Claude 4 SonnetNot measured | MarginNo overlap | DeepSeek V4 Flash38.8 |
| Math | Claude 4 SonnetNot measured | MarginNo overlap | DeepSeek V4 Flash40.8 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 72.7%B 73.7%Winner: DeepSeek V4 FlashΔ 1SWE-bench Verified: Claude 4 Sonnet scored 72.7%; DeepSeek V4 Flash scored 73.7%. DeepSeek V4 Flash 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 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4 Sonnet$3 input / $15 output | DeepSeek V4 Flash$0.14 input / $0.28 output | DeepSeek V4 Flash has the lower combined listed price. |
| Generation speedtokens per second | Claude 4 Sonnet40 tok/s | DeepSeek V4 FlashNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 4 Sonnet1.33 s | DeepSeek V4 FlashNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 4 Sonnet200K | DeepSeek V4 Flash1M | DeepSeek V4 Flash lists the larger context window. |
Benchmark Deep Dive
Agentic7 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash | Result |
|---|---|---|---|
| τ²-bench resultsSource | 52.3% | — | Not comparable |
| Gert LabsSource | 39.66% | 54.35% | DeepSeek V4 Flash leads |
| JobBenchSource | 18.4% | — | Not comparable |
| Terminal-Bench 2.0Source | — | 49.1% | Not comparable |
| MCP AtlasSource | — | 64% | Not comparable |
| ToolathlonSource | — | 40.7% | Not comparable |
| Claw-EvalSource | — | 57.8% | Not comparable |
CodingClaude 4 Sonnet wins5 benchmarks
Reasoning4 benchmarks
Knowledge12 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 25.5% | — | Not comparable |
| AA-GPQA DiamondSource | 68.3% | — | Not comparable |
| AA-HLESource | 4.0% | — | Not comparable |
| AA-Omniscience IndexSource | -9.2% | — | Not comparable |
| AA-Omniscience AccuracySource | 22.4% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 40.8% | — | Not comparable |
| MMLU-ProSource | — | 83% | Not comparable |
| SimpleQASource | — | 23.1% | Not comparable |
| Chinese-SimpleQASource | — | 71.5% | Not comparable |
| GPQASource | — | 71.2% | Not comparable |
| GPQA-DSource | — | 71.2% | Not comparable |
| HLESource | — | 8.1% | Not comparable |
Math4 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4 Sonnet | DeepSeek V4 Flash | Result |
|---|---|---|---|
| AA-IFBenchSource | 45.4% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude 4 Sonnet or DeepSeek V4 Flash?
DeepSeek V4 Flash is ahead on BenchLM's BenchAlign leaderboard, 58.88 to 42.79. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 72.7% and 73.7%.
Which is better for coding, Claude 4 Sonnet or DeepSeek V4 Flash?
Claude 4 Sonnet has the edge for coding in this comparison, averaging 72.7 versus 64.2. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Related Comparisons
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.