DeepSeek V3.1 Terminus
by DeepSeek · deepseek/deepseek-v3.1-terminus · #153 cheapest of 422 paid models
Prices updated Sep 19, 2026, 6:21 PM UTC · refreshed hourly
DeepSeek-V3.1 Terminus is an update to [DeepSeek V3.1](/deepseek/deepseek-chat-v3.1) that maintains the model's original capabilities while addressing issues reported by users, including language consistency and agent capabilities, further optimizing the model's...
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Pricing
Input
$0.27
per 1M tokens
Output
$1.00
per 1M tokens
Blended (3:1)
$0.453
3 input : 1 output
Cache read
$0.135
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for DeepSeek V3.1 Terminus with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $0.453 | $0.0285 | — |
| 50% | $0.402 | $0.0218 | −24% |
| 90% | $0.361 | $0.0164 | −43% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates (available for OpenAI / Anthropic / Google — not flagged for this creator). Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.000435 | $0.435 |
| Document summary | 8,000 | 1,000 | $0.00316 | $3.16 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.0101 | $10.10 |
| Long-context analysis | 150,000 | 5,000 | $0.0455 | $45.50 |
Performance
Intelligence Index
13.9
AA composite quality
Coding Index
43.5
Math Index
53.7
Agentic Index
8.9
Output speed
0 tok/s
median
Time to first token
0s
median
Time to first answer
0s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| MMLU-Pro | 83.6% |
| GPQA Diamond | 75.1% |
| Humanity's Last Exam | 8.7% |
| LiveCodeBench | 52.9% |
| AIME 2025 | 53.7% |
| IFBench | 41.2% |
| AA-LCR (Long Context Reasoning) | 45.3% |
| Terminal-Bench Hard | 31.8% |
| τ²-Bench (Telecom) | 37.1% |
Design Arena Elo
| Category | Elo |
|---|---|
| Website | 1,199 |
| UI components | 1,197 |
| Data viz | 1,182 |
| SVG | 1,089 |
| 3D | 1,169 |
| Game dev | 1,154 |
| Code categories | 1,190 |
Specs
Context window
164K
tokens
Max output
33K
tokens
Input modalities
text
Tokenizer
DeepSeek