Pairwise benchmark snapshot · Aug 16, 2026
This page compares Claude Opus 4.6 (Anthropic) and DeepSeek V4 Flash (DeepSeek) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Opus 4.6 is ahead by 84 points (1,574 vs 1,490; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Claude Opus 4.6 resolves 75.9% versus 71.2% (seed-bootstrap (Aug 1, 2026)). DeepSeek V4 Flash streams faster (142 tok/s) while DeepSeek V4 Flash is the cheaper output token ($0.28/1M). DeepSeek V4 Flash has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.
Anthropic
Claude Opus 4.6Follow-on Opus release. Slightly behind 4.5 on official SWE-bench bash-only in the last published sweep; stronger long-horizon agent traces.
DeepSeek
DeepSeek V4 FlashDeepSeek Jul 31 2026 price-performance SKU. Public listings put it near $0.14/$0.28 per 1M tokens.
Instant pairwise benchmark recalculation across 400+ LLMs
Category wins across intelligence, speed, and pricing efficiency.
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
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
84 pts advantage
78 tok/s faster
$24.72/1M cheaper
Simulate monthly production API costs based on published $/1M tokens.
DeepSeek V4 Flash is estimated to save $540.90/month ($6,491/year).
Higher SWE-bench (75.9%).
Lower output list price ($0.28/1M).
Lower TTFT (165 ms).
Larger window (1M).
Claude Opus 4.6 is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Opus 4.6 | Higher SWE-bench (75.9%). |
| 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 (1M). |
| Screenshots / vision | Claude Opus 4.6 | Claude Opus 4.6 is the side marked multimodal in the catalog. |
Public listings put Flash near $0.14/$0.28 per 1M. That is a batch SKU, not a chatbot crown.
Slightly behind 4.5 on one official SWE-bench sweep; stronger long-horizon traces. We keep the row for old vs URLs.
No comments posted on this matchup yet. Be the first to share an evaluation note!
The real PNG is generated at /compare/claude-opus-4-6-vs-deepseek-v4-flash/opengraph-image for crawlers.
Verified head-to-head card
