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Claude Sonnet 5 vs DeepSeek V4.1 Flash

For a typical chat reply (2,000 tokens in, 400 out), Claude Sonnet 5 costs 27× as much as DeepSeek V4.1 Flash: $8.00 against $0.299 per 1,000 requests at list price on 2026-09-28.

Claude Sonnet 5DeepSeek V4.1 Flash
Input, per 1M tokens$2.00$0.0295
Output, per 1M tokens$10.00$0.60
Context window1M1.05M
Classification or routing (600 tokens in, 10 out), per 1,000$1.30$0.0237
Chat reply (2,000 in, 400 out), per 1,000$8.00$0.299
Retrieval-augmented answer (8,000 in, 500 out), per 1,000$21.00$0.536
Confidence signalnoyes
Tool callingyesyes
BANKING77, correct of 400308316

Which one should carry your traffic?

If DeepSeek V4.1 Flash answers your requests as well as Claude Sonnet 5, moving that traffic saves 96% on chat-shaped requests. Averages cannot tell you whether it does for your requests. DeepSeek V4.1 Flash exposes a confidence signal, so Gimbix can let it answer first and hand unsure cases to Claude Sonnet 5.

Claude Sonnet 5 profile · DeepSeek V4.1 Flash profile · Measure it on your traffic