Head-to-Head Model Pricing & Benchmark Breakdown
DeepSeek V4 Pro vs GPT-5.6 Terra: Frontier Reasoning Cost & Performance Comparison
Evaluate token savings, mathematical benchmark parity, and 1M context chain-of-thought pricing.
Adjust Your Custom Token Workload
Monthly Requests50k
Input Tokens / Req4000
Output Tokens / Req1800
Prompt Cache %50%
DeepSeek V4 Pro is 81.1% More Cost-Effective
Saves $1,079.20 per month ($12,950.40/yr) at this volume.
Annualized Savings$12,950.40
DeepSeek
Most EconomicalDeepSeek V4 Pro
Total Monthly Cost
$250.80 / month
$5.02 per 1,000 requestsInput Tokens / 1M:$0.66
Cached Input / 1M:$0.066
Output Tokens / 1M:$1.98
Context Window:1M
Inference Speed:~75 TPS
OpenAI
GPT-5.6 Terra
Total Monthly Cost
$1,330.00 / month
$26.60 per 1,000 requestsInput Tokens / 1M:$2.00
Cached Input / 1M:$0.500
Output Tokens / 1M:$12.00
Context Window:1.1M
Inference Speed:~70 TPS
The Verdict: Which Model Wins on Cost & ROI?
DeepSeek V4 Pro delivers frontier reasoning at a 67% discount on input ($0.66 vs $2.00) and 83% discount on output ($1.98 vs $12.00) with 1M context window, making it the most cost-effective reasoning engine in production.
Key Architectural & Economic Differences
- DeepSeek V4 Pro input is 3x cheaper ($0.66/1M vs $2.00/1M for GPT-5.6 Terra).
- DeepSeek V4 Pro output is 6x cheaper ($1.98/1M vs $12.00/1M for GPT-5.6 Terra).
- Both feature 1,000,000+ token context windows.
- DeepSeek V4 Pro provides a 90% prompt caching discount ($0.066/1M cached input).
When to Choose DeepSeek V4 Pro
- • High-scale reasoning tasks on a startup or production SaaS budget
- • Automated theorem proving, algorithmic problem solving, and math tutoring
- • Cost-conscious developer agent workflows requiring 1M context
When to Choose GPT-5.6 Terra
- • Enterprise security auditing and formal vulnerability verification
- • Longest chain-of-thought generations requiring up to 100,000 output tokens
- • OpenAI platform integrated workflows with strict US enterprise SLAs
Detailed Spec & Pricing Comparison Table
| Specification / Metric | DeepSeek V4 Pro (DeepSeek) | GPT-5.6 Terra (OpenAI) | Advantage |
|---|---|---|---|
| Input Price / 1M Tokens | $0.66 | $2.00 | DeepSeek V4 Pro |
| Cached Input Price / 1M | $0.066 (90%) | $0.500 (75%) | DeepSeek V4 Pro |
| Output Price / 1M Tokens | $1.98 | $12.00 | DeepSeek V4 Pro |
| Context Window | 1M | 1.1M | GPT-5.6 Terra |
| Inference Speed (Tokens/Sec) | ~75 TPS | ~70 TPS | DeepSeek V4 Pro |
| MMLU Benchmark Score | 94.1% | 95% | GPT-5.6 Terra |
Frequently Asked Questions
For a workload generating 50,000 reasoning requests monthly (each with 4,000 input tokens and 2,000 output tokens), GPT-5.6 Terra costs approximately $1,600/month, whereas DeepSeek V4 Pro costs around $330/month—a massive 79.4% reduction.
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