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How smart is DeepSeek-V3.1-Terminus?

102 SI-IQ · 90% interval 89–115
Not ranked: too little data

DeepSeek-V3.1-Terminus is a model from DeepSeek, released on Sep 22, 2025. Its SI-IQ is 102 (90% interval 89–115), estimated from 2 benchmark results by 1 evaluator.

Data as of Oct 18, 2026 · method 1.0.0

A model is ranked when its results come from at least 5 benchmarks (the two GPQA Diamond runs count as one) in at least 3 areas, from at least 2 different evaluators, and its versions are released no more than 60 days apart. This model does not meet that yet, so it is shown with a provisional estimate but not ranked.

Facts

Developer: DeepSeek
Released: Sep 22, 2025
Access: Open weights (restricted licence)
Benchmarks used: 2 benchmark results from 1 evaluator

Ability by area (SI-IQ, 90% interval)

Every benchmark result we used

Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.

Benchmark	Area	Score	Implied SI-IQ	Evaluated by	As listed by the source	Retrieved	Source
GPQA Diamond (OpenRouter run)	Knowledge	79.4%	110	OpenRouter	`deepseek/deepseek-v3.1-terminus` StreamLake · median over providers (5 of 5 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file
τ²-bench Airline (OpenRouter run)	Agents	48.3%	87	OpenRouter	`deepseek/deepseek-v3.1-terminus` SiliconFlow · median over providers (4 of 4 rows), lower median	Oct 18, 2026	OpenRouter benchmark datasets · data file

Human preference (Arena)

On the Arena leaderboard, where people vote between two anonymous answers, DeepSeek-V3.1-Terminus has a rating of 1,415 (1,405–1,424) from 3,608 votes (published Oct 15, 2026). Human preference is a different measure from benchmark ability and is not part of SI-IQ. Arena (Hugging Face)

Computed with SI-IQ method version 1.0.0. Read the full methodology

Data sources: Arena leaderboard dataset on Hugging Face (CC BY 4.0); Source: OpenRouter (openrouter.ai), licensed under CC BY 4.0: reuse and republish with attribution to OpenRouter (licences and changes).