DeepSeek V3.1 Terminus
DeepSeek · Released Sep 2025
DeepSeek V3.1 Terminus is an updated version of DeepSeek V3.1 that refines language consistency and agent task performance.
- Strengths
- Handles long-context tasks with a 163K token window and maintains coherent performance across diverse languages and agentic workflows.
- Best for
- Building multi-turn agent systems, processing long documents, and applications requiring consistent multilingual reasoning.
- Limitations
- As an incremental update, improvements over V3.1 are targeted to specific issues rather than broad capability gains; performance on novel reasoning tasks may not exceed the original version.
Input / 1M
$0.27
Output / 1M
$1.00
Cached input / 1M
$0.135
Context window
131K
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in decreased 0.0% out increased 5.3%
- 90d
- in decreased 0.0% out increased 5.3%
- 1y
- in decreased 0.0% out increased 5.3%
- Since launch
- in decreased 0.0% out increased 5.3%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 15 Jul 2026 | $0.27 | $1.00 | $0.135 | Imported from OpenRouter | openrouter.ai |
| 11 Jun 2026 | $0.27 | $0.95 | $0.13 | Imported from OpenRouter | openrouter.ai |