LLMCost

DeepSeek: DeepSeek V3.1 vs OpenAI: GPT-5.6 Terra Pro

On input price, DeepSeek: DeepSeek V3.1 is ~8.0× cheaper. Verified 2026-10-21.

DeepSeek: DeepSeek V3.1 $0.250/$0.950vsOpenAI: GPT-5.6 Terra Pro $2.00/$12.00

Verdict

On blended price (3:1 input:output), DeepSeek: DeepSeek V3.1 is ~10.6× cheaper ($0.250/$0.950 vs $2.00/$12.00 per 1M tokens).

Pricing

Per-million-token list prices, verified 2026-10-21. Green marks the better value.

MetricDeepSeek: DeepSeek V3.1OpenAI: GPT-5.6 Terra Pro
Input / 1M$0.250$2.00
Output / 1M$0.950$12.00
Cache read / 1M$0.130$0.200
Blended (3:1)$0.425/1M$4.50/1M
Estimated monthly costDeepSeek: DeepSeek V3.1OpenAI: GPT-5.6 Terra Pro
Chatbot10,000 reqs · 800/400 tok$5.80$64.00
Coding agent5,000 reqs · 8000/2000 tok$19.50$200.00
RAG pipeline30,000 reqs · 4000/500 tok$44.25$420.00

Plug in your own numbers in the calculator, or paste a real bill into the Bill Shredder.

Specifications & capabilities

MetricDeepSeek: DeepSeek V3.1OpenAI: GPT-5.6 Terra Pro
Context window164K1.1M
Max output33K128K
Vision input–✓
Tool calling✓✓
Reasoning✓✓

Quality

Intelligence Index by Artificial Analysis (independent evaluations, 0–100).

Verified intelligence scores aren't available for both models yet. See the full leaderboard.

Performance

Measured by Artificial Analysis on live endpoints.

Output speed — higher is better
DeepSeek: DeepSeek V3.1120 tok/s
OpenAI: GPT-5.6 Terra Pro80 tok/s
Latency (TTFT) — lower is better
DeepSeek: DeepSeek V3.1800 ms
OpenAI: GPT-5.6 Terra Pro1,300 ms
MetricDeepSeek: DeepSeek V3.1OpenAI: GPT-5.6 Terra Pro
Cost per task$0.000006$0.000016

Provider

Infrastructure metrics for the organizations behind these models.

MetricDeepSeekOpenAI
Listed endpoints612
Reliability99.6%99.9%
Avg latency480 ms450 ms
Pricing tiersstandard, freestandard, batch, provisioned

Full details: DeepSeek: DeepSeek V3.1 pricing · OpenAI: GPT-5.6 Terra Pro pricing