Claude Sonnet 5.5 vs DeepSeek V4 Flash 0731
anthropic/claude-sonnet-5.5 · deepseek/deepseek-v4-flash-0731
As of November 1, 2026, DeepSeek V4 Flash 0731 is the cheaper API on UberLLM: $0.0009 per million input tokens and $0.0018 per million output, versus $0.1003 / $0.5017 for Claude Sonnet 5.5, about 100% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose DeepSeek V4 Flash 0731 to cut cost; choose Claude Sonnet 5.5 when its capabilities fit your task better.
Claude Sonnet 5.5 vs DeepSeek V4 Flash 0731, side by side
| Spec | Claude Sonnet 5.5 | DeepSeek V4 Flash 0731 |
|---|---|---|
| Price · input / 1M | $0.1003 | $0.0009 |
| Price · output / 1M | $0.5017 | $0.0018 |
| Context length | 1,000,000 | 1,048,576 |
| Max output tokens | 128,000 | 65,536 |
| Input modalities | text, image, file | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | — |
| Reasoning | Yes | Yes |
| % off list | 95% off | 99.2% off |
| First token, median (7 days) | 2.9 s (173 requests) | — |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 1, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Claude Sonnet 5.5 vs DeepSeek V4 Flash 0731 — FAQ
Is Claude Sonnet 5.5 or DeepSeek V4 Flash 0731 cheaper?
DeepSeek V4 Flash 0731 is cheaper on a blended token mix, by about 100%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Claude Sonnet 5.5 and DeepSeek V4 Flash 0731?
Claude Sonnet 5.5: $0.1003 in / $0.5017 out per 1M tokens. DeepSeek V4 Flash 0731: $0.0009 in / $0.0018 out per 1M tokens. That's roughly a 100% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 5.5 and DeepSeek V4 Flash 0731 with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.