DeepSeek
DeepSeek V3.1
DeepSeek V3.1 is a DeepSeek model with 128K context, $0.25 in / $0.95 out per million tokens, last verified September 3, 2026. Open weights: yes. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
DeepSeek V3.1 is the open-weight (MIT) general model — 671B/37B MoE, 128K context, strong reasoning at low cost.
Catalog record checked September 3, 2026Individual provider fields may change
| Specification | DeepSeek V3.1 |
|---|---|
| Provider | DeepSeek |
| Tier | Budget |
| Context window | 128K |
| Max output | 128K |
| Input / 1M tokens | $0.25 |
| Output / 1M tokens | $0.95 |
| Weights | Open |
| Parameters | 671B total / 37B active (MoE) |
| Reasoning levels | low, high, max |
| Modalities | text |
| License | MIT |
| Released | August 21, 2025 |
Pricing tiers: Third-party hosted ~$0.25/$0.95 per MTok; first-party peak/off-peak rates vary — verify on api-docs.deepseek.com.
Verified evidence
Published benchmark results
Each result keeps its source and measurement date visible. A missing benchmark is not treated as a zero.
| Benchmark | Score | Measured | Source |
|---|---|---|---|
| Artificial Analysis Intelligence Index | 44 | 2026-08-14 | Artificial Analysis · View source |
Best for
- Cost-sensitive hosted agents
- High-volume coding assist
- Open-weight deployments
Watch out
Source receipts
Catalog figures for this model were checked against the following sources.
- DeepSeek — V3.1 (accessed 2026-08-29)
- CloudPrice — DeepSeek V3.1 (accessed 2026-08-29)
Common questions
DeepSeek V3.1
Answered from the verified figures on this page rather than general guidance.
How much does DeepSeek V3.1 cost per million tokens?
DeepSeek V3.1 is listed at $0.25 per million input tokens and $0.95 per million output tokens at standard rates. Output tokens usually dominate real bills, so weigh the output rate more heavily than the input rate. Third-party hosted ~$0.25/$0.95 per MTok; first-party peak/off-peak rates vary — verify on api-docs.deepseek.com.
What is DeepSeek V3.1's context window?
DeepSeek V3.1 accepts about 128K tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.
What is DeepSeek V3.1 best for?
DeepSeek V3.1 is a budget tier from DeepSeek. It suits cost-sensitive hosted agents, high-volume coding assist, open-weight deployments. Self-hosting needs datacentre VRAM; hosted rates differ by provider.
Can I self-host DeepSeek V3.1?
DeepSeek V3.1 publishes open weights, but self-hosting depends on the licence, hardware footprint, quantisation quality, and serving stack. A hosted API is often cheaper until you have measured throughput and concurrency on your own hardware.