Head-to-head showdown: DeepSeek V4 Flash Vision Exp ($0.44 in / $1.32 out per 1M) vs GPT-5.6 Terra ($2.00 in / $12.00 out per 1M). DeepSeek V4 Flash Vision Exp is 8× cheaper across standard token mixes, with 1.1M vs 1.1M context windows.
deepseek-v4-flash-vision-exp · deepseek
gpt-5.6-terra · openai
Benchmarks
DeepSeek V4 Flash Vision Exp
No verified third-party composite score published.
GPT-5.6 Terra
Third-party composite indices via OpenRouter's live catalog — source and verification date on each model page.
Cost by Volume
| Workload Scenario | DeepSeek V4 Flash Vision Exp | GPT-5.6 Terra | Price Delta |
|---|---|---|---|
| 1M input tokens (raw text) | $0.44 | $2.00 | −$1.56 |
| 1M output tokens (generation) | $1.32 | $12.00 | −$10.68 |
| 1M tokens · 70% input / 30% output mix | $0.704 | $5.00 | −$4.296 |
| Standard chat turn (4K in / 800 out, 50% cached) | $0.001964 | $0.014 | −$0.012 |
| Monthly scale (10K requests / day) | $589.20 | $4,200.00 | −$3,610.80 |
Negative difference = DeepSeek V4 Flash Vision Exp is cheaper. Positive = GPT-5.6 Terra is cheaper.
Best For
Fit score = weighted composite blend for each use case; value = fit ÷ cost per 1,000 requests. Scoreboard: DeepSeek V4 Flash Vision Exp 0 – 8 GPT-5.6 Terra.
| Use case | Fit — DeepSeek V4 Flash Vision Exp | Fit — GPT-5.6 Terra | Cost / 1K — DeepSeek V4 Flash Vision Exp | Cost / 1K — GPT-5.6 Terra | Winner |
|---|---|---|---|---|---|
| Customer support chatbot | — | 56.1 | $0.9583 | $6.79 | GPT-5.6 Terra — only scored model |
| RAG / search-augmented answers | — | 58.7 | $2.476 | $14.80 | GPT-5.6 Terra — only scored model |
| AI coding assistant | — | 68.0 | $4.853 | $35.04 | GPT-5.6 Terra — only scored model |
| Document summarization | — | 56.7 | $10.727 | $52.70 | GPT-5.6 Terra — only scored model |
| Agentic workflow | — | 56.8 | $8.504 | $51.20 | GPT-5.6 Terra — only scored model |
| Content generation | — | 56.7 | $1.834 | $15.568 | GPT-5.6 Terra — only scored model |
| Data extraction & tagging | — | 63.4 | $1.04 | $6.28 | GPT-5.6 Terra — only scored model |
| Translation | — | 57.3 | $9.141 | $74.65 | GPT-5.6 Terra — only scored model |
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-5.6 Terra: 1.1M) may justify the premium for your task.
FAQ
On input, DeepSeek V4 Flash Vision Exp is cheaper ($0.44/M vs $2.00/M). On output, DeepSeek V4 Flash Vision Exp is cheaper ($1.32/M vs $12.00/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 $0.014 on GPT-5.6 Terra — DeepSeek V4 Flash Vision Exp is 7.1× cheaper for that workload.
DeepSeek V4 Flash Vision Exp supports 1,050,000 tokens (384K max output); GPT-5.6 Terra supports 1,050,000 (128K max output). They are equal.