deepseek/deepseek-v3.1-terminusDeepSeek-V3.1-Terminus is DeepSeek’s open-weights AI model, released Sep 22, 2025. It costs $0.27/M input and $1/M output tokens, and handles a 164K-token context window.
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…
Scores on standardized evaluations. Higher is better — and rank shows where DeepSeek-V3.1-Terminus lands among all models tracked on Model Beat.
Graduate-level scientific reasoning
Frontier of human expert knowledge
Broad expert knowledge
Contamination-free coding
Scientific research coding
Olympiad-qualifier math
Tool-agent-user reliability
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…
DeepSeek-V3.1-Terminus is an AI model developed by DeepSeek, part of the DeepSeek family, released Sep 22, 2025.
DeepSeek-V3.1-Terminus is served from $0.27 per million input tokens and $1 per million output tokens (cheapest credible provider on OpenRouter: SiliconFlow).
DeepSeek-V3.1-Terminus supports a context window of up to 164K tokens.
On standardized evaluations tracked by Epoch AI, DeepSeek-V3.1-Terminus scores 85.1% on MMLU-Pro, 79.8% on LiveCodeBench, 89.7% on AIME 2024/2025.
DeepSeek-V3.1-Terminus is released with open weights (Open weights (unrestricted)), so the model can be downloaded and self-hosted.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Aug 5, 2026.