DeepSeek-V3.1 Release

Introducing DeepSeek-V3.1: our first step toward the agent era! 🚀

• 🧠 Hybrid inference: Think & Non-Think — one model, two modes

• ⚡️ Faster thinking: DeepSeek-V3.1-Think reaches answers in less time vs. DeepSeek-R1-0528

• 🛠️ Stronger agent skills: Post-training boosts tool use and multi-step agent tasks

Try it now — toggle Think/Non-Think via the "DeepThink" button: https://chat.deepseek.com/

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API Update ⚙️

• 🔹 deepseek-chat → non-thinking mode

• 🔹 deepseek-reasoner → thinking mode

• 🧵 128K context for both

• 🔌 Anthropic API format supported: https://api-docs.deepseek.com/guides/anthropic_api

• ✅ Strict Function Calling supported in Beta API: https://api-docs.deepseek.com/guides/function_calling

• 🚀 More API resources, smoother API experience

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Tools & Agents Upgrades 🧰

• 📈 Better results on SWE / Terminal-Bench

• 🔍 Stronger multi-step reasoning for complex search tasks

• ⚡️ Big gains in thinking efficiency

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Model Update 🤖

• 🔹 V3.1 Base: 840B tokens continued pretraining for long context extension on top of V3

• 🔹 Tokenizer & chat template updated — new tokenizer config: https://huggingface.co/deepseek-ai/DeepSeek-V3.1/blob/main/tokenizer_config.json

• 🔗 V3.1 Base Open-source weights: https://huggingface.co/deepseek-ai/DeepSeek-V3.1-Base

• 🔗 V3.1 Open-source weights: https://huggingface.co/deepseek-ai/DeepSeek-V3.1

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Pricing Changes 💳

• 🔹 New pricing starts & off-peak discounts end at Sep 5th, 2025, 16:00 (UTC Time)

• 🔹 Until then, APIs follow current pricing

• 📝 Pricing page: https://api-docs.deepseek.com/quick_start/pricing/