MODEL PROOF
DeepSeek V3.1 Terminus
BETTER VALUE OPTION
A stored alternative has an equal-or-higher measured score and an equal-or-lower price.
Serving precision differs between offers.
GLM 5.3 Flash · Δ score 52.5 points · 48% lower measured price · $0.238 / 1M tokens
MiMo-V2.6-Flash is a further stored option with these losses: 147K → 131K max output
- Independent LMArena score
- 1,417.1 ± 9.74 · 3,599 votes
- Context window
- 163.84K
- Maximum output
- 147.46K
- Input modalities
- text
- Output modalities
- text
- Published input price
- $0.270 / 1M tokens
- Published output price
- $1.00 / 1M tokens
- Pricing kind
- fixed
Inspect complete billing conditions and endpoint terms below.
Price from SiliconFlow: the cheapest offer that is serving, at standard delivery and at a declared precision that is not 4-bit (fp8), at its standard rate. The maker’s own precision is not known.
Every price dimension · USD per million tokens
| Input | $0.270/M |
|---|---|
| Output | $1.00/M |
| Cached input | Unknown/M |
| Cache write | Unknown/M |
| Cache write 1h | Unknown/M |
| Reasoning | Unknown/M |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
Headline cheapest is a lower precision. Like-for-like at the best declared precision is $0.270/M from SiliconFlow.
2 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| SiliconFlowsiliconflow/fp8 Endpoint terms
| $0.270 | $1.00 | fp8 | 98.50% |
| StreamLakestreamlake Endpoint terms
| $0.343 | $1.03 | undeclared | 99.96% |
Independent scores
| LMArena Elo | 1417.1default |
|---|
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- UI components #57 1189
- Code categories #61 1179
- 3D #61 1148
- Websites #62 1193
- Data visualisation #64 1176
- SVG #70 1064
- Game development #75 1143
Per-task Elo and rank from Design Arena, via OpenRouter’s model feed. The rank is the feed’s, and it counts models OpenRouter does not list.
Capability
| Context window | 163K |
|---|---|
| Max output | 147K |
| Input modes | text |
| Tool use | yes |
| Reasoning | optional |
| Knowledge cutoff | 2025-03-31 |
| Open weights | Unknown |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-10-06 |
| 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...
Questions this page answers
What does DeepSeek V3.1 Terminus cost?
$0.270/M in, $1.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does DeepSeek V3.1 Terminus have an independent quality score?
DeepSeek V3.1 Terminus has an LMArena score in this catalogue.
What beats DeepSeek V3.1 Terminus?
GLM 5.3 Flash has an equal-or-higher measured score and an equal-or-lower price.
Does this page use Artificial Analysis scores for DeepSeek V3.1 Terminus?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
Is the cheapest DeepSeek V3.1 Terminus endpoint the same product?
Headline cheapest is a lower precision. Like-for-like at the best declared precision is $0.270/M from SiliconFlow.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/deepseek__deepseek-v3.1-terminus/)<a href="https://undominated.ai/models/deepseek__deepseek-v3.1-terminus/"><img src="https://undominated.ai/badge/deepseek__deepseek-v3.1-terminus.svg" alt="DeepSeek V3.1 Terminus — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/deepseek__deepseek-v3.1-terminus.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
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