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

# Claude Opus 4.5 Launch: #1 in Coding, 1/3 the Price

> Anthropic's latest flagship model Claude Opus 4.5 is now live! Achieves 80.9% on SWE-bench Verified surpassing all competitors, priced at only 1/3 of the previous Opus. APIYI supports both OpenAI and Anthropic native formats.

## Key Highlights

* **Top Coding**: 80.9% on SWE-bench Verified, surpassing GPT-5.1-Codex-Max (77.9%) and Gemini 3 Pro (76.2%)
* **Price Drop**: \$5/\$25 per million tokens, only 1/3 of previous Opus pricing
* **Coding Champion**: Exceeds historical human top scores on internal engineering interviews, 10.6% higher than Sonnet 4.5 on Aider Polyglot
* **Smart Reasoning**: New effort parameter adjusts reasoning depth, medium mode saves 76% output tokens vs Sonnet 4.5
* **APIYI Available**: Supports both OpenAI and Anthropic native formats, works with Claude Code desktop app

## Background

On November 24, 2025, Anthropic officially released Claude Opus 4.5 (model ID: `claude-opus-4-5-20251101`), a major upgrade following the Claude 4.1 series. This release's biggest highlight is drastically improving performance while cutting prices to 1/3 of the previous generation, breaking the industry assumption that "top models must be expensive."

Claude Opus 4.5 achieves comprehensive breakthroughs in coding, reasoning, and tool use, particularly reaching 80.9% accuracy on real-world software engineering tasks (SWE-bench Verified), surpassing OpenAI GPT-5.1-Codex-Max and Google Gemini 3 Pro to become the most powerful AI coding model available.

APIYI has integrated Claude Opus 4.5 immediately, supporting both OpenAI and Anthropic native formats, allowing developers to switch seamlessly and enjoy top-tier AI capabilities.

## Detailed Analysis

### Core Features

<CardGroup cols={2}>
  <Card title="Top Coding Performance" icon="code">
    80.9% on SWE-bench Verified, surpassing all competitors, exceeds historical human top scores on internal engineering exams
  </Card>

  <Card title="Adjustable Reasoning" icon="sliders-horizontal">
    New effort parameter (low/medium/high) balances speed and quality, medium mode saves 76% output tokens
  </Card>

  <Card title="66% Price Cut" icon="dollar-sign">
    \$5/\$25 per million tokens, only 1/3 of previous generation, making top AI accessible to all
  </Card>

  <Card title="Multimodal Vision" icon="eye">
    Upgraded vision understanding for complex visual tasks like image analysis, chart interpretation, and UI recognition
  </Card>
</CardGroup>

### Performance Benchmarks

Claude Opus 4.5 demonstrates exceptional performance across multiple authoritative benchmarks, especially in coding and reasoning:

| Benchmark              | Claude Opus 4.5                  | GPT-5.1-Codex-Max | Gemini 3 Pro | Sonnet 4.5 |
| ---------------------- | -------------------------------- | ----------------- | ------------ | ---------- |
| **SWE-bench Verified** | **80.9%**                        | 77.9%             | 76.2%        | 77.2%      |
| **Aider Polyglot**     | **10.6% higher than Sonnet 4.5** | -                 | -            | Baseline   |
| **Vending-Bench**      | **29% higher than Sonnet 4.5**   | -                 | -            | Baseline   |

<Info>
  Source: Anthropic official blog (published November 24, 2025), SWE-bench Verified is the industry-recognized benchmark for real software engineering tasks.
</Info>

**Coding Breakthroughs**:

* Achieves 80.9% accuracy on real codebase fixing tasks
* Exceeds historical human top scores on internal engineering recruitment exams
* 10.6% improvement over Sonnet 4.5 on Aider Polyglot multilingual programming tests

**Reasoning Efficiency Innovation**:

* New `effort` parameter adjusts reasoning depth (low/medium/high)
* Medium mode matches Sonnet 4.5 output quality while using only 24% of output tokens
* Significantly reduces costs while maintaining quality

### Technical Specifications

| Parameter             | Specification                           |
| --------------------- | --------------------------------------- |
| **Context Length**    | 200,000 tokens                          |
| **Max Output**        | 64,000 tokens                           |
| **Knowledge Cutoff**  | March 2025                              |
| **Multimodal**        | Image input supported (enhanced vision) |
| **Reasoning Control** | effort parameter (low/medium/high)      |
| **API Formats**       | OpenAI compatible / Anthropic native    |

<Warning>
  Reasoning mode (effort parameter) affects response speed and token consumption: high mode has best quality but slower speed, low mode is fast but limited reasoning depth, medium mode balances performance and cost.
</Warning>

## Practical Applications

### Recommended Use Cases

With top coding ability and reasoning depth, Claude Opus 4.5 is ideal for:

1. **Complex Code Development**: Multi-file project refactoring, architecture design, code review
2. **Software Engineering**: Bug fixing, feature implementation, test case generation
3. **Deep Reasoning Analysis**: Technical decisions, solution comparison, problem diagnosis
4. **Multimodal Applications**: UI design analysis, chart data extraction, document understanding
5. **Long Text Processing**: 200K token context supports full codebase analysis

### Code Examples

#### OpenAI Format

```python theme={null}
from openai import OpenAI

client = OpenAI(
    api_key="your-apiyi-key",
    base_url="https://api.apiyi.com/v1"
)

response = client.chat.completions.create(
    model="claude-opus-4-5-20251101",
    messages=[
        {
            "role": "user",
            "content": "Refactor this Python code to improve performance and add error handling..."
        }
    ],
    # Optional: set reasoning depth (default medium)
    extra_body={
        "anthropic_effort": "high"  # low/medium/high
    }
)

print(response.choices[0].message.content)
```

#### Anthropic Native Format

```python theme={null}
import anthropic

client = anthropic.Anthropic(
    api_key="your-apiyi-key",
    base_url="https://api.apiyi.com"
)

message = client.messages.create(
    model="claude-opus-4-5-20251101",
    max_tokens=8192,
    messages=[
        {
            "role": "user",
            "content": "Analyze the pros and cons of this architecture design..."
        }
    ],
    # Set reasoning depth
    extra_headers={
        "anthropic-effort": "high"
    }
)

print(message.content[0].text)
```

#### Using in Claude Code

Claude Code desktop app has integrated Opus 4.5. Configure in settings:

```json theme={null}
{
  "model": "claude-opus-4-5-20251101",
  "apiKey": "your-apiyi-key",
  "baseURL": "https://api.apiyi.com/v1"
}
```

### Best Practices

1. **Choose the right reasoning mode**:
   * **low mode**: Quick response, simple tasks, cost-sensitive scenarios
   * **medium mode** (default): Balances quality and cost, suitable for most scenarios
   * **high mode**: Complex reasoning, critical tasks, quality-first scenarios

2. **Leverage long context**:
   * 200K token context can hold \~150K Chinese characters or full codebases
   * Ideal for multi-turn dialogue, long document analysis, repository-level operations

3. **Apply multimodal capabilities**:
   * Upload UI screenshots for AI to generate corresponding code
   * Analyze architecture diagrams and get optimization suggestions
   * Extract data from charts and generate reports

4. **Cost optimization tips**:
   * Use medium mode first (saves \~70% output tokens vs high mode)
   * Compared to previous Opus, same tasks cost 66% less
   * With APIYI recharge bonuses, actual cost can be as low as 80%

## Pricing & Availability

### Pricing

| Item       | Claude Opus 4.5       | Claude Opus 4.1       | Reduction |
| ---------- | --------------------- | --------------------- | --------- |
| **Input**  | \$5 / million tokens  | \$15 / million tokens | **-66%**  |
| **Output** | \$25 / million tokens | \$75 / million tokens | **-66%**  |

<Info>
  Price is only 1/3 of previous generation (66% reduction), drastically lowering costs while maintaining top performance.
</Info>

**Competitor Price Comparison**:

| Model               | Input Price | Output Price | Performance     |
| ------------------- | ----------- | ------------ | --------------- |
| **Claude Opus 4.5** | **\$5**     | **\$25**     | SWE-bench 80.9% |
| GPT-5.1-Codex-Max   | \$1.25      | \$10         | SWE-bench 77.9% |
| Gemini 3 Pro        | \$2         | \$12         | SWE-bench 76.2% |
| Claude Sonnet 4.5   | \$3         | \$15         | SWE-bench 77.2% |

<Info>
  While slightly more expensive than competitors, Claude Opus 4.5 significantly leads in performance, offering better value for complex tasks.
</Info>

### Recharge Bonuses

**APIYI Recharge Bonuses**:

* Recharge ¥100+: 10% bonus
* Recharge ¥500+: 15% bonus
* Recharge ¥1000+: 20% bonus

**Actual Cost**: With bonus activities, Claude Opus 4.5 actual usage cost can be as low as:

* Input: \$4 / million tokens (80% of list price)
* Output: \$20 / million tokens (80% of list price)

### Purchase Channels

**APIYI Platform**:

* Website: `apiyi.com`
* OpenAI format support (`https://api.apiyi.com/v1`)
* Anthropic native format support (`https://api.apiyi.com`)
* Compatible with Claude Code desktop app

**Other Channels**:

* Anthropic official API
* AWS Bedrock
* Google Cloud Vertex AI
* Azure AI

## Summary & Recommendations

Claude Opus 4.5's release marks a new milestone in AI coding capabilities. It not only tops authoritative benchmarks like SWE-bench Verified but also achieves a 66% price reduction, making top AI truly accessible.

**Core Advantages**:

* **Coding Champion**: 80.9% SWE-bench Verified, surpassing all competitors
* **Best Value**: Only 1/3 of previous generation pricing, effort parameter further optimizes costs
* **Reasoning Depth**: High mode for complex tasks, medium mode balances quality and cost
* **Mature Ecosystem**: Supports OpenAI/Anthropic dual formats, compatible with Claude Code

**Usage Recommendations**:

1. **Complex Coding Tasks**: Prioritize Opus 4.5 with high or medium mode
2. **Cost Optimization**: Use medium mode, leverage APIYI recharge bonuses to reduce costs
3. **Rapid Development**: Downgrade to Sonnet 4.5 (\$3/\$15) for simple tasks to save costs
4. **Long Text Processing**: Fully utilize 200K token context for complete project processing

**Who Should Use Opus 4.5**:

* Developers needing strongest coding capabilities
* Researchers handling complex reasoning tasks
* Enterprise applications prioritizing quality
* Codebase analysis scenarios requiring long context support

APIYI has fully integrated Claude Opus 4.5, supporting both OpenAI and Anthropic formats. Register and recharge now to enjoy bonus benefits and experience the coding champion's powerful capabilities!

<Info>
  Sources: Anthropic official blog (November 24, 2025), SWE-bench official benchmark data. Data retrieved: November 25, 2025.
</Info>