Pairwise benchmark snapshot · Aug 17, 2026
In this head-to-head showdown, Claude Opus 5 delivers higher overall intelligence and human-preferred responses (Elo 1,624 vs 1,490), while Claude Opus 5 leads in SWE-bench software engineering benchmarks (79.2%), while DeepSeek V4 Flash is more budget-friendly at $0.28/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
10 benchmarks evaluated across capability, speed, and cost
Anthropic current default flagship. Official API $5/$25 per 1M tokens and a 1M context window (Anthropic, Jul 24 2026).
DeepSeek Jul 31 2026 price-performance SKU. Public listings put it near $0.14/$0.28 per 1M tokens.
Currently comparing Claude Opus 5 vs DeepSeek V4 Flash. Alternative family tiers available.
Simulate accuracy gains vs added response time & token cost
Reasoning models “think before answering” by generating internal reasoning tokens. Higher effort improves math, coding, and logic accuracy, but increases response delay and token costs.
Δ 134 Arena Elo pts
142 tok/s
$0.28 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top standard models across 6 key capability dimensions. Tap any spoke or dot to inspect.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | Claude Opus 5 | DeepSeek V4 Flash | Advantage Delta |
|---|---|---|---|
| Preference Elo | +134 | ||
| Coding Elo | +102 | ||
| LiveBench | +7% | ||
| SWE-bench | +8% | ||
| GPQA Diamond | +5.5% | ||
| Time to first token | +145 ms | ||
| Output speed | 72 tok/s | 142 tok/s | +70 tok/s |
| Input price | $0.14/1M | +$9.86/1M | |
| Output price | $0.28/1M | +$49.72/1M | |
| Context window | +311k |
Simulate monthly production API costs in USD (US Dollar).
DeepSeek V4 Flash is estimated to save $1,090.90/month ($13,091/year).
Higher SWE-bench (79.2%).
Lower output list price ($0.28/1M).
Lower TTFT (165 ms).
Larger window (1.3M).
Claude Opus 5 is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Opus 5 | Higher SWE-bench (79.2%). |
| High-volume chat | DeepSeek V4 Flash | Lower output list price ($0.28/1M). |
| Voice / low-latency UI | DeepSeek V4 Flash | Lower TTFT (165 ms). |
| Long-document RAG | DeepSeek V4 Flash | Larger window (1.3M). |
| Screenshots / vision | Claude Opus 5 | Claude Opus 5 is the side marked multimodal in the catalog. |
Usually Sonnet 5 vs Opus 5. Coding delta versus output $/1M. The workhorse question.
Public listings put Flash near $0.14/$0.28 per 1M. That is a batch SKU, not a chatbot crown.
Top Anthropic vs top Google. Usually Opus 5 vs 3.6 Pro. Two different invoices.
Not a frozen 2025 article. Today that is usually Opus 5 vs GPT-5.6 Sol. Dated cells, not a brand fight.
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Verified Head-to-Head Telemetry
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