Head-to-head showdown: DeepSeek V4 Flash Vision Exp ($0.44 in / $1.32 out per 1M) vs GPT-5.5 Pro ($30.00 in / $180.00 out per 1M). DeepSeek V4 Flash Vision Exp is 119.3× cheaper across standard token mixes, with 1.1M vs 512K context windows.
deepseek-v4-flash-vision-exp · deepseek
gpt-5.5-pro · openai
Cost by Volume
| Workload Scenario | DeepSeek V4 Flash Vision Exp | GPT-5.5 Pro | Price Delta |
|---|---|---|---|
| 1M input tokens (raw text) | $0.44 | $30.00 | −$29.56 |
| 1M output tokens (generation) | $1.32 | $180.00 | −$178.68 |
| 1M tokens · 70% input / 30% output mix | $0.704 | $75.00 | −$74.296 |
| Standard chat turn (4K in / 800 out, 50% cached) | $0.001964 | $0.21 | −$0.208 |
| Monthly scale (10K requests / day) | $589.20 | $63,000.00 | −$62,410.80 |
Negative difference = DeepSeek V4 Flash Vision Exp is cheaper. Positive = GPT-5.5 Pro is cheaper.
Best For
Fit score = weighted composite blend for each use case; value = fit ÷ cost per 1,000 requests.
| Use case | Fit — DeepSeek V4 Flash Vision Exp | Fit — GPT-5.5 Pro | Cost / 1K — DeepSeek V4 Flash Vision Exp | Cost / 1K — GPT-5.5 Pro | Winner |
|---|---|---|---|---|---|
| Customer support chatbot | — | — | $0.9583 | $101.85 | no data |
| RAG / search-augmented answers | — | — | $2.476 | $222.00 | no data |
| AI coding assistant | — | — | $4.853 | $525.60 | no data |
| Document summarization | — | — | $10.727 | $790.50 | no data |
| Agentic workflow | — | — | $8.504 | $768.00 | no data |
| Content generation | — | — | $1.834 | $233.52 | no data |
| Data extraction & tagging | — | — | $1.04 | $94.20 | no data |
| Translation | — | — | $9.141 | $1,119.75 | no data |
Costs use each use case's typical token mix and cacheable share. Fit weights are documented on the methodology page.
Scaling Curve
Total cost of a token volume at 70/30 input/output split (uncached). Log-log scale.
Verdict
DeepSeek V4 Flash Vision Exp is cheaper on both input and output rates, so it costs less at every input/output mix. Price alone still isn't the whole decision: capability, latency and context limits (DeepSeek V4 Flash Vision Exp: 1.1M, GPT-5.5 Pro: 512K) may justify the premium for your task.
FAQ
On input, DeepSeek V4 Flash Vision Exp is cheaper ($0.44/M vs $30.00/M). On output, DeepSeek V4 Flash Vision Exp is cheaper ($1.32/M vs $180.00/M). The same model is cheaper on both sides, so it wins at every mix.
A chat-style request (4,000 input + 800 output tokens, 50% cached) costs $0.001964 on DeepSeek V4 Flash Vision Exp and $0.21 on GPT-5.5 Pro — DeepSeek V4 Flash Vision Exp is 106.9× cheaper for that workload.
DeepSeek V4 Flash Vision Exp supports 1,050,000 tokens (384K max output); GPT-5.5 Pro supports 512,000 (64K max output). DeepSeek V4 Flash Vision Exp fits 2.1× more context, which matters for long documents and agents.