# 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: [Anthropic API guide](https://api-docs.deepseek.com/guides/anthropic_api.md)

- ✅ Strict Function Calling supported in Beta API: [Tool Calls guide](https://api-docs.deepseek.com/guides/tool_calls.md)

- 🚀 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

![](https://cdn.deepseek.com/api-docs/v3.1_benchmark_1.webp)

![](https://cdn.deepseek.com/api-docs/v3.1_benchmark_2.webp)

![](https://cdn.deepseek.com/api-docs/v3.1_benchmark_3.webp)

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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: [Models & Pricing](https://api-docs.deepseek.com/quick_start/pricing.md)

![](https://cdn.deepseek.com/api-docs/v3.1_price_en.jpeg)