Compare / head-to-head
Claude Sonnet 5vs
DeepSeek V4 Flash
Claude Sonnet 5 leads 14 of 21 shared benchmarks. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
14 – 7
Claude Sonnet 5 leads
Cheaper per token
—
list price, input + output
Larger context
Tie
both 1M tokens
Providers
2 providers
Anthropic · DeepSeek
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
DeepSeek V4 Flash
DeepSeek · released 2026-07-31
text
- Context
- 1M
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 28 · 7 core
Quality
Benchmark matrix
21 shared · 10 only Claude Sonnet 5 · 7 only DeepSeek V4 Flash| Benchmark | Claude Sonnet 5 | DeepSeek V4 Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 21 | ||||
| GPQA Diamond | 90.5% ↗epoch run | 91% ↗epoch run | -0.5 pt | DeepSeek V4 Flash |
| LMArena Elo | 1461.8 ↗ | 1436 ↗ | +25.8 | Claude Sonnet 5 |
| Chess Puzzles (Epoch AI run) | 35% ↗epoch run | 33% ↗epoch run | +2 pt | Claude Sonnet 5 |
| DeepSWE v1.1 (Datacurve) | 53.8% ↗ | 53.3% ↗ | +0.5 pt | Claude Sonnet 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 29.3% ↗epoch run | 24.4% ↗epoch run | +4.9 pt | Claude Sonnet 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 65.6% ↗epoch run | 57.5% ↗epoch run | +8.1 pt | Claude Sonnet 5 |
| LiveBench Agentic Coding (LiveBench) | 59.4% ↗ | 46.8% ↗ | +12.6 pt | Claude Sonnet 5 |
| LiveBench Coding (LiveBench) | 80.7% ↗ | 75% ↗ | +5.7 pt | Claude Sonnet 5 |
| LiveBench Data Analysis (LiveBench) | 71.7% ↗ | 79.3% ↗ | -7.6 pt | DeepSeek V4 Flash |
| LiveBench Instruction Following (LiveBench) | 63.9% ↗ | 65.5% ↗ | -1.6 pt | DeepSeek V4 Flash |
| LiveBench Language (LiveBench) | 75% ↗ | 79.2% ↗ | -4.2 pt | DeepSeek V4 Flash |
| LiveBench Mathematics (LiveBench) | 92.9% ↗ | 86.8% ↗ | +6.1 pt | Claude Sonnet 5 |
| LiveBench Reasoning (LiveBench) | 88.7% ↗ | 86.6% ↗ | +2.1 pt | Claude Sonnet 5 |
| LMArena WebDev (LMArena) | 1539.4 ↗ | 1581 ↗ | -41.6 | DeepSeek V4 Flash |
| Mystery Game Puzzles (Epoch AI run) | 35% ↗epoch run | 34% ↗epoch run | +1 pt | Claude Sonnet 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 94.7% ↗epoch run | 94.4% ↗epoch run | +0.3 pt | Claude Sonnet 5 |
| SimpleBench (SimpleBench) | 60.6% ↗ | 61.1% ↗ | -0.5 pt | DeepSeek V4 Flash |
| SimpleQA Verified | 33.7% ↗epoch run | 33.6% ↗epoch run | +0.1 pt | Claude Sonnet 5 |
| Terminal-Bench 4.0 (Vals AI) | 9.6% ↗ | 18.7% ↗ | -9.1 pt | DeepSeek V4 Flash |
| Toolathlon-Verified (HKUST) | 71.6% ↗ | 70.7% ↗ | +0.9 pt | Claude Sonnet 5 |
| WeirdML (Håvard Tveit Ihle) | 68.8% ↗ | 63% ↗ | +5.8 pt | Claude Sonnet 5 |
| Only Claude Sonnet 5 reports · 10 | ||||
| SWE-bench Verified | 85.2% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 43.2% ↗ | not reported | — | — |
| APEX-Agents (Mercor) | 54.5% ↗ | not reported | — | — |
| GSO Opt@1 (GSO) | 36.3% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.4% ↗ | not reported | — | — |
| LMArena Agent (LMArena) | 0.044 ↗ | not reported | — | — |
| LMArena Vision (LMArena) | 1264.5 ↗ | not reported | — | — |
| SAGE (Vals AI) | 48.9% ↗ | not reported | — | — |
| SWE-rebench 2026-05-15 to 2026-07-01 (Nebius) | 56.8% ↗ | not reported | — | — |
| Vending-Bench 2 (Andon Labs) | 6377.7 ↗ | not reported | — | — |
| Only DeepSeek V4 Flash reports · 7 | ||||
| Agents' Last Exam | not reported | 25.2% ↗ | — | — |
| AutomationBench Public | not reported | 25.1% ↗ | — | — |
| Cybergym | not reported | 76.7% ↗ | — | — |
| DeepSWE | not reported | 54.4% ↗ | — | — |
| NL2Repo | not reported | 54.2% ↗ | — | — |
| Terminal Bench 2.1 | not reported | 82.7% ↗ | — | — |
| Toolathlon-Verified | not reported | 70.3% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Sonnet 5 minus DeepSeek V4 Flash in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Sonnet 5 | DeepSeek V4 Flash | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | — | — |
| Input price / 1M | $2 ↗ | — | — |
| Output price / 1M | $10 ↗ | — | — |
| Cached input / 1M | $0.2 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | — | — |
| Modalities | text · vision | text | Claude Sonnet 5 |
| Released | 2026-06-30 | 2026-07-31 | — |
| Cited benchmark scores | 36 | 28 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Sonnet 5 vs …
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DeepSeek V4 Flash vs …
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Which one wins on your data?
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