> ## Documentation Index
> Fetch the complete documentation index at: https://docs.laozhang.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# September–December 2025 Announcement Archive

> LaoZhang API announcements from September through December 2025 for model launches, pricing, and service updates.

## 📅 December 2025

### 🚀 GPT-5.2 Stunning Release

**December 11, 2025**

<Card>
  **GPT-5.2 - OpenAI's Annual Flagship Model**

  * 🚀 **New Model**: `gpt-5.2` / `gpt-5.2-2025-12-11`

  * 💰 **Pricing Details**:
    * Same price as OpenAI official
    * Actual charges follow the real-time console price

  * 🌟 **Core Features**:
    * **30%** less hallucination rate, significantly improved accuracy
    * Supports Instant/Thinking/Pro three modes
    * 128K ultra-long context window
    * Excellent performance in professional work tasks

  <Info>
    GPT-5.2 is OpenAI's 2025 year-end masterpiece, particularly outstanding in professional work scenarios. Recommended for enterprise users requiring high accuracy.
  </Info>
</Card>

## 📅 November 2025

### 🧠 Claude Opus 4.5 Most Intelligent Model Release

**November 24, 2025**

<Card>
  **Claude Opus 4.5 - Anthropic's Strongest Brain**

  * 🚀 **New Model**: `claude-opus-4-5-20251101` / `claude-opus-4-5-20251101-thinking`

  * 💰 **Pricing Details**:
    * Same price as Anthropic official
    * Pay-as-you-go usage for better cost control

  * 🌟 **Core Features**:
    * Anthropic's most intelligent model to date
    * Supports **effort parameter** to control response token count
    * Top-tier in coding, agents, computer use capabilities
    * 200K ultra-long context window
    * Supports Thinking chain-of-thought reasoning mode

  <Info>
    Claude Opus 4.5 excels in complex reasoning and long document processing, the first choice for enterprise-grade challenging tasks.
  </Info>
</Card>

### 🌟 Gemini 3 Series Major Launch

**November 18, 2025**

<Card>
  **Gemini 3 Pro/Flash - Google's Next-Gen AI**

  * 🚀 **New Models**:
    * `gemini-3-pro-preview` - Flagship version, 2M ultra-long context
    * `gemini-3-flash-preview` - Lightning version, new default model for Gemini app
    * `gemini-3-pro-image-preview` - Image generation specialized

  * 💰 **Pricing Details**:
    * Same price as Google official
    * Actual charges follow the real-time console price

  * 🌟 **Core Features**:
    * **Major capability upgrade** compared to Gemini 2.5
    * Pro version supports 2M token ultra-long context
    * Flash version provides lightning-fast response speed
    * Supports Thinking/NoThinking dual modes

  <Info>
    Gemini 3 series is Google's latest generation model, now the new default model for Gemini app. Recommended for long text processing and fast response scenarios.
  </Info>
</Card>

### 📦 GPT-5.1 Series Launch

**November 13, 2025**

<Card>
  **GPT-5.1 Series - Coding Capability Upgraded**

  * 🚀 **New Models**:
    * `gpt-5.1` / `gpt-5.1-2025-11-13` - Main version
    * `gpt-5.1-codex` series - Coding specialized (High/Medium/Mini)

  * 🌟 **Core Features**:
    * Strong comprehensive capability, balanced cost-performance
    * Codex series provides multi-tier coding model selection
    * 128K ultra-long context window

  <Info>
    GPT-5.1-Codex series is specially optimized for coding scenarios, with corresponding versions from complex architecture design to quick code completion.
  </Info>
</Card>

## 📅 October 2025

### ⚡ Claude Haiku 4.5 Fast Version Launch

**October 15, 2025**

<Card>
  **Claude Haiku 4.5 - Speed and Cost Optimized**

  * 🚀 **New Model**: `claude-haiku-4-5-20251001` / `claude-haiku-4-5-20251001-thinking`

  * 💰 **Pricing Details**:
    * Fast response, lower cost
    * Suitable for large-scale concurrent calls

  * 🌟 **Core Features**:
    * Fast response, extremely low latency
    * Supports Thinking reasoning mode
    * 200K context window
    * First choice for daily quick tasks

  <Info>
    Claude Haiku 4.5 is the best choice for cost-sensitive applications, significantly reducing costs while maintaining high-quality output.
  </Info>
</Card>

## 📅 September 2025

### 💻 Claude Sonnet 4.5 Coding Champion Launch

**September 29, 2025**

<Card>
  **Claude Sonnet 4.5 - Developer's First Choice**

  * 🚀 **New Model**: `claude-sonnet-4-5-20250929` / `claude-sonnet-4-5-20250929-thinking`

  * 💰 **Pricing Details**:
    * Balanced performance and cost
    * Best value for coding scenarios

  * 🌟 **Core Features**:
    * **Top coding capability**, leading code generation quality
    * Suitable as AI agent's brain
    * Outstanding frontend and UI development ability
    * Supports Thinking chain-of-thought reasoning

  <Info>
    Claude Sonnet 4.5 performs excellently in coding scenarios, particularly suitable as backend model for programming tools like Cursor, Cline.
  </Info>
</Card>

***

[Back to the 2025 archive index](/en/announcements/changelog-archive-2025)