Head-to-head · 2026
DeepSeek V4 vs Claude Opus 4.8
Verdict. Opus 4.8 is the stronger model outright; DeepSeek V4 is the open-weight value play — frontier-class coding at roughly a third of the price, and you can own the weights.
| DeepSeek V4 | Claude Opus 4.8 | |
|---|---|---|
| Provider | DeepSeek | Anthropic |
| Released | 2026-04-24 | 2026-05-28 |
| Context | 1M | 1M |
| Max output | 384K | 128K |
| Input /1M | $0.44 | $5.00 |
| Output /1M | $0.87 | $25.00 |
| Modalities | text, code | text, vision, code |
The analysis
This is the open-vs-closed decision at the top of the market. DeepSeek V4 (MIT, open weights) posts 80.6% SWE-bench Verified and an Artificial Analysis Intelligence Index around 52 — genuinely frontier-adjacent — at roughly $1.74/$3.48 per 1M via API, or $0 marginal cost self-hosted. Claude Opus 4.8 leads the aggregate index (GDPval-AA 1890, SWE-Bench Pro 69.2%) and brings a 1M context plus deep agentic tooling.
The gap is real but narrower than the price gap. Independent US-government testing (NIST/CAISI) put the DeepSeek line a few months behind the closed frontier — so for the hardest reasoning and longest-horizon agents, Opus 4.8 still wins. For high-volume coding, data control, or sovereignty, DeepSeek V4 delivers most of the capability at a fraction of the cost.
Rule of thumb: route the expensive-failure, top-of-funnel reasoning to Opus 4.8 and run the high-volume, verifiable, or data-sensitive work on self-hosted DeepSeek V4.
Pick DeepSeek V4 if…
- You want open weights / self-hosting under MIT
- High-volume coding at a fraction of frontier cost
- Data sovereignty or air-gapped deployment
Pick Claude Opus 4.8 if…
- You need the absolute top of the intelligence index
- 1M-context synthesis and long-horizon agentic depth
- Managed reliability over owning the stack
DeepSeek V4
Open-weight frontier-class coding at one-sixth the price — MIT-licensed, 1M context, self-hostable.
Claude Opus 4.8
Modest version bump, real frontier gains — tops the intelligence index at the same price as 4.7.