---
title: Anthropic: Claude Opus 4.8 (Fast) | Text Generation | ModelsLab
description: Build with Anthropic: Claude Opus 4.8 (Fast) API by Anthropic. Text generation, chat, code, and reasoning. Pay-per-use. Free tier.
url: https://modelslab.com/models/anthropic/anthropic-claude-opus-4.8-fast.md
canonical: https://modelslab.com/models/anthropic/anthropic-claude-opus-4.8-fast.md
type: product
component: Playground/LLM/Index
generated_at: 2026-06-03T19:33:04.134599Z
---

Anthropic: Claude Opus 4.8 (Fast)
---

 [LLMs.txt](https://modelslab.com/models/open_router/anthropic-claude-opus-4.8-fast/llms.txt) [.md](https://modelslab.com/models/anthropic/anthropic-claude-opus-4.8-fast.md)

Anthropic: Claude Opus 4.8 (Fast)
---

Choose a prompt below to get started or type your own message

 Explain quantum computing in simple terms

 Write a Python function to sort a list

 Create a marketing email for a SaaS product

 Compare REST vs GraphQL APIs

Send

### Anthropic: Claude Opus 4.8 (Fast)

anthropic anthropic-claude-opus-4.8-fast

Copy model ID

PricingInput $10.00 / 1M tokens

Output $50.00 / 1M tokens

API EndpointsOpenAI Compatible

`https://modelslab.com/api/v7/llm/chat/completions`Endpoint

Anthropic Compatible

`https://modelslab.com/api/v7/llm/v1/messages`Messages

`https://modelslab.com/api/v7/llm/v1/messages/count_tokens`Count Tokens

`https://modelslab.com/api/v7/llm/v1/models`Models

Use with Claude Code

cURL Example

ParametersSystem MessageYou are a helpful AI assistant specialized in providing accurate and detailed responses.

Temperature0.7

Max Tokens1000

Top P0.9

Frequency Penalty0

Presence Penalty0

Model Info

Support

Related Models
---

Discover similar models you might be interested in

 [View all LLM Models](https://modelslab.com/models?feature=llmaster)

[#### open\_router/Arcee AI: Trinity Mini

arcee-ai-trinity-mini

From $0.10/M tokens](https://modelslab.com/models/open_router/arcee-ai-trinity-mini)

[#### open\_router/MiniMax: MiniMax M2.5

minimax-minimax-m2.5

From $0.65/M tokens](https://modelslab.com/models/open_router/minimax-minimax-m2.5)

[#### mistral\_ai/Mistral (7B) Instruct

mistralai-Mistral-7B-Instruct-v0.1

From $0.20/M tokens](https://modelslab.com/models/mistral_ai/mistralai-Mistral-7B-Instruct-v0.1)

[#### open\_router/MiniMax: MiniMax M2.7

minimax-minimax-m2.7

From $0.74/M tokens](https://modelslab.com/models/open_router/minimax-minimax-m2.7)

[#### open\_router/Z.ai: GLM 4.6V

z-ai-glm-4.6v

From $0.60/M tokens](https://modelslab.com/models/open_router/z-ai-glm-4.6v)

[#### open\_router/AionLabs: Aion-2.0

aion-labs-aion-2.0

From $1.20/M tokens](https://modelslab.com/models/open_router/aion-labs-aion-2.0)

[#### open\_router/Qwen: Qwen3.5 397B A17B

qwen-qwen3.5-397b-a17b

From $1.36/M tokens](https://modelslab.com/models/open_router/qwen-qwen3.5-397b-a17b)

[#### open\_router/DeepSeek: DeepSeek V3

deepseek-deepseek-chat

From $0.50/M tokens](https://modelslab.com/models/open_router/deepseek-deepseek-chat)

[#### open\_router/xAI: Grok 4.20 Multi-Agent

x-ai-grok-4.20-multi-agent

From $4.00/M tokens](https://modelslab.com/models/open_router/x-ai-grok-4.20-multi-agent)

[#### open\_router/Qwen2.5 72B Instruct

qwen-qwen-2.5-72b-instruct

From $0.38/M tokens](https://modelslab.com/models/open_router/qwen-qwen-2.5-72b-instruct)

[#### open\_router/WizardLM-2 8x22B

microsoft-wizardlm-2-8x22b

From $0.62/M tokens](https://modelslab.com/models/open_router/microsoft-wizardlm-2-8x22b)

[#### open\_router/DeepSeek: DeepSeek V4 Pro

deepseek-deepseek-v4-pro

From $0.65/M tokens](https://modelslab.com/models/open_router/deepseek-deepseek-v4-pro)

[#### byteplus/Seed 1.8

seed-1.8

From $3.00/M tokens](https://modelslab.com/models/byteplus/seed-1.8)

[#### open\_router/Google: Gemini 2.5 Pro

google-gemini-2.5-pro

From $5.63/M tokens](https://modelslab.com/models/open_router/google-gemini-2.5-pro)

[#### open\_router/Z.ai: GLM 5V Turbo

z-ai-glm-5v-turbo

From $2.60/M tokens](https://modelslab.com/models/open_router/z-ai-glm-5v-turbo)

[#### together\_ai/Pearl-ai Gemma-4-31B-it-pearl

pearl-ai-gemma-4-31b-it

From $0.57/M tokens](https://modelslab.com/models/together_ai/pearl-ai-gemma-4-31b-it)

[#### open\_router/StepFun: Step 3.5 Flash

stepfun-step-3.5-flash

From $0.20/M tokens](https://modelslab.com/models/open_router/stepfun-step-3.5-flash)

[#### open\_router/OpenAI: gpt-oss-safeguard-20b

openai-gpt-oss-safeguard-20b

From $0.19/M tokens](https://modelslab.com/models/open_router/openai-gpt-oss-safeguard-20b)

Open Source Alternatives
---

Explore open-source models that offer similar capabilities with full transparency and flexibility

 [View all open source models](https://modelslab.com/models?feature=llm&provider=open-source-models)

[MU](https://modelslab.com/models/modelslab/uncensored-chat)[ModelsLab](https://modelslab.com/models/modelslab)

 [Modelslab: Uncensored Chat

Open Source Model](https://modelslab.com/models/modelslab/uncensored-chat)

About Anthropic: Claude Opus 4.8 (Fast)
---

Fast-mode variant of \[Opus 4.8\](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

### Technical Specifications

Model IDanthropic-claude-opus-4.8-fast

CategoryLLM Models

TaskText Generation

Price$30 per million tokens

AddedMay 28, 2026

### Key Features

- Chat completion and multi-turn conversation API
- Streaming response with token-by-token output
- Function calling and tool use support
- System prompts and role-based messaging
- JSON mode and structured output

### Quick Start

Integrate Anthropic: Claude Opus 4.8 (Fast) into your application with a single API call. Get your API key from the [pricing page](https://modelslab.com/pricing) to get started.

PythonJavaScriptcURLPHP

```
<code>import requests
import json

url = "https://modelslab.com/api/v7/llm/chat/completions"

headers = {
    "Content-Type": "application/json"
}

data = {
        "model_id": "anthropic-claude-opus-4.8-fast",
        "messages": [
            {
                "role": "user",
                "content": "Hello!"
            }
        ],
        "max_tokens": 1000,
        "key": "YOUR_API_KEY"
    }

try:
    response = requests.post(url, headers=headers, json=data)
    response.raise_for_status()  # Raises an HTTPError for bad responses (4XX or 5XX)
    result = response.json()
    print("API Response:")
    print(json.dumps(result, indent=2))
except requests.exceptions.HTTPError as http_err:
    print(f"HTTP error occurred: {http_err} - {response.text}")
except Exception as err:
    print(f"Other error occurred: {err}")</code>
```

### Pricing

Anthropic: Claude Opus 4.8 (Fast) API costs $30.000000 per million tokens. Pay only for what you use with no minimum commitments. [View pricing plans](https://modelslab.com/pricing)

### Use Cases

- AI chatbots and virtual assistants
- Code generation and developer tools
- Content writing and copywriting automation
- Data analysis, summarization, and extraction

[Browse LLM Models](https://modelslab.com/models?feature=llmaster) [More from Anthropic](https://modelslab.com/models/open_router) [View Pricing](https://modelslab.com/pricing)

Anthropic: Claude Opus 4.8 (Fast) FAQ
---

### What is Anthropic: Claude Opus 4.8 (Fast)?

Fast-mode variant of \[Opus 4.8\](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

### How do I use the Anthropic: Claude Opus 4.8 (Fast) API?

You can integrate Anthropic: Claude Opus 4.8 (Fast) into your application with a single API call. Sign up on ModelsLab to get your API key, then use the model ID "anthropic-claude-opus-4.8-fast" in your API requests. We provide SDKs for Python, JavaScript, and cURL examples in the API documentation.

### How much does Anthropic: Claude Opus 4.8 (Fast) cost?

Anthropic: Claude Opus 4.8 (Fast) costs $30.000000 per million tokens. ModelsLab uses pay-per-use pricing with no minimum commitments. A free tier is available to get started.

### What is the Anthropic: Claude Opus 4.8 (Fast) model ID?

The model ID for Anthropic: Claude Opus 4.8 (Fast) is "anthropic-claude-opus-4.8-fast". Use this ID in your API requests to specify this model.

### Does Anthropic: Claude Opus 4.8 (Fast) have a free tier?

Yes, ModelsLab offers a free tier that lets you try Anthropic: Claude Opus 4.8 (Fast) and other AI models. Sign up to get free API credits and start building immediately.

---

*This markdown version is optimized for AI agents and LLMs.*

**Links:**
- [Website](https://modelslab.com)
- [API Documentation](https://docs.modelslab.com)
- [Blog](https://modelslab.com/blog)

---
*Generated by ModelsLab - 2026-06-04*