How much cheaper is DeepSeek V4 Flash than Claude Sonnet 5?

DeepSeek V4 Flash costs $0.22/$0.66 per 1M tokens while Claude Sonnet 5 costs $2/$10. DeepSeek V4 Flash is 95% cheaper on input and 98% cheaper on output. For 1M input + 500K output tokens/month, Sonnet 5 costs $10.50 vs DeepSeek V4 Flash's $0.55 — saving $10.22/month.

When should I choose Sonnet 5 over DeepSeek V4 Flash?

Choose Sonnet 5 ($2/$10) when quality matters: complex reasoning, code generation, nuanced analysis. Choose DeepSeek V4 Flash ($0.22/$0.66) when cost is king: high-volume batch processing, simple classification, content filtering. The quality gap is real — DeepSeek V4 Flash trades quality for 95%+ cost savings.

Does DeepSeek V4 Flash have comparable quality to Sonnet 5?

No. Sonnet 5 ($2/$10) delivers premium quality with strong reasoning and code capabilities. DeepSeek V4 Flash ($0.22/$0.66) is optimized for speed and cost, not quality. For tasks requiring nuanced output, Sonnet 5 is significantly better. For simple, high-volume tasks, DeepSeek V4 Flash offers exceptional value.

Is DeepSeek V4 Flash still available?

DeepSeek V4 Flash was retired in September 2026. The legacy deepseek-v4-flash model name still accepts requests, but they are served by DeepSeek-V4.1-Flash and billed at its current Flash rates ($0.15 input / $0.60 output per 1M tokens off-peak, $0.30/$1.20 peak). The $0.22/$0.66 figures shown on this page are V4 Flash's pre-retirement prices, kept as a labeled historical comparison baseline.