Compare Claude Opus 5.5 from Anthropic and DeepSeek V4.1 Flash from DeepSeek on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
| Attribute | Claude Opus 5.5 | DeepSeek V4.1 Flash |
|---|---|---|
| Input price | $4/M tokens | $0.035/M tokens |
| Output price | $20/M tokens | $0.50/M tokens |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Intelligence Index | 58.4 | Not available |
| Coding Index | Not available | Not available |
| Agentic Index | Not available | Not available |
| Latency (p50) | 3.79 s | 0.74 s |
| Throughput (p50) | 68.0 tok/s | 81.0 tok/s |
| Provided by | Anthropic | DeepSeek |
| Model page | Claude Opus 5.5 model details, providers and pricing | DeepSeek V4.1 Flash model details, providers and pricing |
Benchmark data updated
DeepSeek V4.1 Flash is cheaper than Claude Opus 5.5 on OpenRouter: DeepSeek V4.1 Flash costs $0.035/M tokens input and $0.50/M tokens output, while Claude Opus 5.5 costs $4/M tokens input and $20/M tokens output.
DeepSeek V4.1 Flash has the longer context window at 1,048,576 tokens, compared with 1,000,000 tokens for Claude Opus 5.5.
DeepSeek V4.1 Flash is faster on OpenRouter, generating a median 81.0 tokens per second compared with 68.0 tokens per second for Claude Opus 5.5.