Side-by-side API pricing and tokenizer details for DeepSeek V3 (DeepSeek) and GPT-4o (OpenAI).
Side-by-side pricing
Feature
DeepSeek V3
GPT-4o
Provider
DeepSeek
OpenAI
Input (per 1M tokens)
$0.270
$2.50
Output (per 1M tokens)
$1.10
$10.00
Context caching
No
No
Batch API discount
Not available
50% off
Context window
128K tokens
128K tokens
Tokenizer
SentencePiece (Llama)
o200k_base (tiktoken)
ⓘ DeepSeek V3: Retired from DeepSeek's own API on 2026-07-24. Figures reflect third-party hosts and are not vendor-published; verify before relying on them.
ⓘ GPT-4o: Deprecated by OpenAI. API access shuts down 2026-10-23; calls will error after that date. Prices are no longer listed on OpenAI's pricing page and could not be re-verified from a vendor source.
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 V3
$0.3550
Input: $0.1350 +Output: $0.2200
GPT-4o
$3.2500
Input: $1.2500 +Output: $2.0000
DeepSeek V3 is 89% cheaper for this workload — saving $2.8950 per month at this volume.
Frequently asked questions
Yes, DeepSeek V3 is cheaper for the typical workload above. At $0.270/1M input and $1.10/1M output tokens, it costs $0.3550 versus $3.2500 for GPT-4o — a 89% difference. Costs scale linearly with request volume, so larger workloads amplify this gap.
DeepSeek V3 supports a 128K token context window. GPT-4o supports a 128K token context window. A larger context window lets you include more text — documents, conversation history, or code — in a single API call.
DeepSeek V3 does not support context caching. It does not offer a batch API discount. GPT-4o does not support context caching. It offers a 50% Batch API discount.
No, they use different tokenizers. DeepSeek V3 uses the SentencePiece (Llama), while GPT-4o 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 V3 (DeepSeek): $0.27 input / $1.1 output per 1M tokens. GPT-4o (OpenAI): $2.5 input / $10 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 V3 costs $0.9340 per 1M total tokens and GPT-4o costs $8.5000. DeepSeek V3 is 89% cheaper for this pattern. For your exact ratio, paste a real prompt into the calculator above.
DeepSeek V3 has a 128K-token context window — approximately 96K words or ~384 pages of standard text. GPT-4o has a 128K-token context window — approximately 96K words or ~384 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.