DeepSeek: DeepSeek V3.1 Terminus API Pricing
DeepSeek: DeepSeek V3.1 Terminus costs $0.270 per 1M input tokens and $1.00 per 1M output tokens. Context window: 164K. Prices verified 2026-10-21 · source
Alternatives to consider
93% cheaper with nearly identical quality (20.1 vs 14.8)
+31.5 quality points for 20% more
Cheapest deepseek model — 83% less per month
Rebuilt daily from our snapshot archive — the chart appears once a model has 5+ snapshots of history.
High adoption means battle-tested weights, more fine-tunes/quants, and faster bug fixes. View on HuggingFace →
From our own daily snapshot archive — independent of provider announcements.
Intelligence measures reasoning/knowledge/coding benchmarks. A high score with a low blended price = value pick; check the value chart to see where this model lands.
Higher effort = deeper thinking = more reasoning tokens billed as output.
Training data ends here — newer events require retrieval or web search.
What would DeepSeek: DeepSeek V3.1 Terminus cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $6.16 |
| Coding agent | 5,000 | 8,000 / 2,000 | $20.80 |
| RAG pipeline | 30,000 | 4,000 / 500 | $47.40 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $12.80 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About DeepSeek: DeepSeek V3.1 Terminus
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...
Compare DeepSeek: DeepSeek V3.1 Terminus with
- V3.1 Terminus vs OpenAI: GPT-5.6 Terra Pro
- V3.1 Terminus vs Anthropic: Claude Fable 5
- V3.1 Terminus vs Anthropic: Claude Opus 5
- V3.1 Terminus vs OpenAI: GPT-5.6 Sol
Popular head-to-heads — see all on the comparisons index.
Frequently asked questions
How much does DeepSeek: DeepSeek V3.1 Terminus cost?
DeepSeek: DeepSeek V3.1 Terminus costs $0.270 per 1M input tokens and $1.00 per 1M output tokens. Verified 2026-10-21 — provider source.
What is the context window?
164K tokens, with up to 147K output tokens per response. That's roughly 205 pages of text in a single request.
Does it support prompt caching?
Prompt-caching pricing is not published for this model via OpenRouter.
What's a cheaper alternative?
ScaleDown: Summarize saves about 94% on a typical workload with comparable quality.
Official resources
- DeepSeek: DeepSeek V3.1 Terminus on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- DeepSeek platform → — first-party API documentation and pricing.
- Shred your current bill — paste a CSV and see if switching saves money.