DeepSeek V3.1 Terminus
DeepSeek released 2025-09-22
$0.453 per million tokens, balanced
DeepSeek V4 Flash 0731 is both better and cheaper.
It scores +20.4 higher and costs 77% less ($0.105/M against $0.453/M) on this workload — and it does everything this model does.
Every price dimension
| Input | $0.270/M |
|---|---|
| Output | $1.00/M |
| Cached input | $0.135/M |
Independent scores
| Intelligence | 31.4 |
|---|---|
| Coding | 43.5 |
| Agentic | 19.9 |
| LMArena Elo | 1419.6thinking |
Sources are listed separately rather than averaged. Across the 62 models both have scored they correlate at r = 0.806 — close agreement overall, but four models rank very differently between them, and a blended score would hide exactly those.
Capability
| Context window | 164K |
|---|---|
| Max output | 33K |
| Input modes | text |
| Tool use | yes |
| Reasoning | optional |
| Knowledge cutoff | 2025-03-31 |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-08-24 |
| Quality data | verified |
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...