Claude Sonnet 5.5 vs DeepSeek V3.1
anthropic/claude-sonnet-5.5 · deepseek/deepseek-v3.1
As of November 8, 2026, DeepSeek V3.1 is the cheaper API on UberLLM: $0.0025 per million input tokens and $0.0094 per million output, versus $0.1716 / $0.8579 for Claude Sonnet 5.5, about 99% 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 V3.1 to cut cost; choose Claude Sonnet 5.5 when context size wins. Claude Sonnet 5.5 carries the larger context window (1,000,000 vs 128,000 tokens), which can matter for long-document work.
Claude Sonnet 5.5 vs DeepSeek V3.1, side by side
| Spec | Claude Sonnet 5.5 | DeepSeek V3.1 |
|---|---|---|
| Price · input / 1M | $0.1716 | $0.0025 |
| Price · output / 1M | $0.8579 | $0.0094 |
| Context length | 1,000,000 | 128,000 |
| Max output tokens | 128,000 | 8,000 |
| Input modalities | text, image, file | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | — |
| Reasoning | Yes | — |
| % off list | 91.4% off | 99% off |
| First token, median (7 days) | 2.0 s (311 requests) | — |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 8, 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 V3.1 — FAQ
Is Claude Sonnet 5.5 or DeepSeek V3.1 cheaper?
DeepSeek V3.1 is cheaper on a blended token mix, by about 99%. 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 V3.1?
Claude Sonnet 5.5: $0.1716 in / $0.8579 out per 1M tokens. DeepSeek V3.1: $0.0025 in / $0.0094 out per 1M tokens. That's roughly a 99% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 5.5 and DeepSeek V3.1 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.