DeepSeek V4 Flash vs GPT-5.4 nano — Side-by-side pricing
Side-by-side API pricing and tokenizer details for DeepSeek V4 Flash (DeepSeek) and GPT-5.4 nano (OpenAI).
Side-by-side pricing
| Feature | DeepSeek V4 Flash | GPT-5.4 nano |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Input (per 1M tokens) | $0.140 | $0.200 |
| Output (per 1M tokens) | $0.280 | $1.25 |
| Context caching | Yes — 98% off cached tokens | Yes — 90% off cached tokens |
| Batch API discount | Not available | 50% off |
| Context window | 1M tokens | 400K tokens |
| Tokenizer | SentencePiece (Llama) | o200k_base (tiktoken) |
Real-world cost example
1,000 API requests per month, each with 500 input tokens and 200 output tokens (500K input + 200K output total).
DeepSeek V4 Flash
$0.1260
Input: $0.0700 +Output: $0.0560
GPT-5.4 nano
$0.3500
Input: $0.1000 +Output: $0.2500
DeepSeek V4 Flash is 64% cheaper for this workload — saving $0.2240 per month at this volume.
Frequently asked questions
Yes, DeepSeek V4 Flash is cheaper for the typical workload above. At $0.140/1M input and $0.280/1M output tokens, it costs $0.1260 versus $0.3500 for GPT-5.4 nano — a 64% difference. Costs scale linearly with request volume, so larger workloads amplify this gap.
DeepSeek V4 Flash supports a 1M token context window. GPT-5.4 nano supports a 400K token context window. A larger context window lets you include more text — documents, conversation history, or code — in a single API call.
DeepSeek V4 Flash supports context caching (98% off repeated tokens). It does not offer a batch API discount. GPT-5.4 nano supports context caching (90% off repeated tokens). It offers a 50% Batch API discount.
No, they use different tokenizers. DeepSeek V4 Flash uses the SentencePiece (Llama), while GPT-5.4 nano uses o200k_base (tiktoken). Different tokenizers split text differently, so the same prompt will produce different token counts on each model — the effective cost difference may be larger or smaller than the per-token price difference alone suggests.
DeepSeek V4 Flash (DeepSeek): $0.14 input / $0.28 output per 1M tokens. GPT-5.4 nano (OpenAI): $0.2 input / $1.25 output per 1M tokens. Rates shown before caching or batch discounts.
For an 80% output / 20% input workload — typical for code generation or long-form writing — DeepSeek V4 Flash costs $0.2520 per 1M total tokens and GPT-5.4 nano costs $1.0400. DeepSeek V4 Flash is 76% cheaper for this pattern. For your exact ratio, paste a real prompt into the calculator above.
DeepSeek V4 Flash has a 1M-token context window — approximately 750K words or ~3K pages of standard text. GPT-5.4 nano has a 400K-token context window — approximately 300K words or ~1K pages. (Estimates assume ~0.75 words per token.)
Calculate costs for your actual prompt
Paste your prompt into the calculator and get exact token counts using each model's real tokenizer — all in your browser.
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