LongCat-2.0 vs DeepSeek V4 Pro
China's two most consequential open-source coding flagships now sit side by side. Meituan's LongCat-2.0 (June 30, 2026) is a 1.6 trillion parameter mixture-of-experts with dynamic activation of 33 to 56 billion parameters per token, native 1M context, MIT license, and 59.5 on SWE-Bench Pro (self-reported). DeepSeek V4 Pro (April 2026) is also 1.6 trillion parameters (49B active per token) with a 1M context under MIT, and it carries an independently reproduced 80.6 on SWE-bench Verified plus a proven track record on OpenRouter. The comparison lines up almost too cleanly: LongCat leads on training-story symbolism (fully trained on domestic Chinese chips) and stealth OpenRouter traction, while V4 Pro leads on verified benchmarks, hosted API pricing, and community mindshare. Independent LongCat verification is still pending; if the SWE-Bench Pro number holds up, this becomes a very tight race.
Head-to-Head Specs
| Spec | LongCat-2.0 | DeepSeek V4 Pro |
|---|---|---|
| Provider | Meituan | DeepSeek |
| Input Price | Free/1M | $0.43/1M |
| Output Price | Free/1M | $0.87/1M |
| Context Window | 1M | 1M |
| Released | 2026-06 | 2026-04 |
| Capabilities | text, code, tool-use, reasoning | text, vision, code, reasoning |
Category Breakdown
V4 Pro has independently reproduced scores including 80.6 SWE-bench Verified; LongCat launch numbers are self-reported on SWE-Bench Pro (59.5)
V4 Pro is available on the DeepSeek API at $0.435/$0.87 per 1M; LongCat has no first-party paid API on launch day (free previews on OpenRouter and longcat.ai)
Both ship under MIT
Both offer a 1M token context window
LongCat is the first trillion-parameter release trained end-to-end on a 50,000-card domestic Chinese cluster, a milestone for non-Western frontier AI
LongCat activates 33 to 56 billion per token dynamically vs V4 Pro's fixed 49 billion; more expressive for agentic tasks that vary in difficulty
V4 Pro has months of production deployment across OpenRouter and self-hosts; LongCat traction is a stealth preview only, though it hit top three by call volume during that window
Choose LongCat-2.0 when:
- ▸Sovereign or geopolitically sensitive deployments where domestic-chip provenance matters
- ▸Agentic workloads with variable per-token difficulty (dynamic activation)
- ▸Teams that want to be early on the next Chinese open-source frontier
- ▸Research on trillion-parameter MoE training on non-Western hardware
Choose DeepSeek V4 Pro when:
- ▸Production systems that need independently verified benchmark performance today
- ▸Teams already paying for the DeepSeek hosted API
- ▸Workloads that cannot wait for LongCat community verification and tooling to mature
- ▸Cost-sensitive inference where V4 Pro's hosted pricing is a known quantity
Frequently Asked Questions
Which is better, LongCat-2.0 or DeepSeek V4 Pro?
It depends on your use case. LongCat-2.0 from Meituan excels at sovereign or geopolitically sensitive deployments where domestic-chip provenance matters, while DeepSeek V4 Pro from DeepSeek is better for production systems that need independently verified benchmark performance today. See the full comparison above for detailed benchmarks and pricing.
How much does LongCat-2.0 cost compared to DeepSeek V4 Pro?
LongCat-2.0 costs Free input and Free output per 1M tokens. DeepSeek V4 Pro costs $0.43 input and $0.87 output per 1M tokens.
What is the context window difference between LongCat-2.0 and DeepSeek V4 Pro?
LongCat-2.0 supports 1M tokens, while DeepSeek V4 Pro supports 1M tokens.