31% offClaude Opus 5 (Fast) API
Anthropic·Vision
Claude Opus 5 (Fast) is a speed-optimized variant of Anthropic's most capable Opus model, offering the same 1M token context window and strong performance across agentic coding, professional knowledge work, and long-horizon reasoning with lower latency.
Pricing
Cheapest live price, per 1 million tokens.
Input / 1M tokens
$10.00 OpenRouter
Output / 1M tokens
$50.00 OpenRouter
Cache read / 1M
Repeated prompt prefixes
Cache read is the discounted rate for repeated prompt prefixes (system prompts, agent context).
Capabilities · 11
Specifications
- Context window
- 1M
- Max output
- 128K
- Type
- Vision
- Creator
- Anthropic
- Live sellers
- 28
- Requests / 24h
- 541
Price history · 60 days
Estimated monthly cost
30 days at the cheapest live price.
Quick start
OpenAI-compatible — change the base URL and key. Get a key from the dashboard.
from openai import OpenAI
client = OpenAI(
base_url="https://api.qubax.ai/v1",
api_key="YOUR_QUBAX_API_KEY",
)
response = client.chat.completions.create(
model="claude-opus-5-fast",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)About Claude Opus 5 (Fast)
Claude Opus 5 (Fast) is a multimodal language model developed by Anthropic. It's particularly well-suited for analyzing images, screenshots, and visual content, tackling complex, multi-step reasoning problems, orchestrating tool-using agents that call APIs and external services, grounding responses in real-time web search results, producing structured outputs for reliable data extraction and handling large contexts of up to 1M tokens. Its 1M-token context window means you can pass in entire documents, codebases, or conversation histories without losing context. It can write up to 128K tokens in a single response.
As of Nov 4, 2026, Claude Opus 5 (Fast) costs $6.94 per 1M input tokens and $34.71 per 1M output tokens on Qubax, versus $10.00 / $50.00 on OpenRouter (31% less on input). A typical 1,000 chat requests (2K tokens in, 500 out) come to about $31.24. 28 independent compute providers currently serve it, so requests fail over automatically. It handled 541 requests on Qubax in the last 24 hours. Pay with USDC, USDT, BTC, ETH or 350+ other coins — no credit card required.
Similar-priced alternatives
Frequently asked questions
How much does the Claude Opus 5 (Fast) API cost?
On Qubax, Claude Opus 5 (Fast) costs $6.94 per 1M input tokens and $34.71 per 1M output tokens. This is 31% cheaper than OpenRouter's price of $10.00 per 1M input tokens.
Is the Claude Opus 5 (Fast) API compatible with OpenAI?
Yes. Qubax provides an OpenAI-compatible API. You can use Claude Opus 5 (Fast) as a drop-in replacement by changing your base URL to https://api.qubax.ai/v1 and using your Qubax API key. It works with Cline, Cursor, OpenCode, Hermes Agent, and any tool that supports OpenAI APIs.
Why is Claude Opus 5 (Fast) cheaper on Qubax than OpenRouter?
Qubax sources AI inference from an open compute marketplace on the Base blockchain where GPU providers compete on price. We pass the savings to you — 31% cheaper than OpenRouter's price for Claude Opus 5 (Fast).
How do I pay for Claude Opus 5 (Fast) API usage?
Qubax uses prepaid crypto credits. Top up with USDC, USDT, BTC, ETH, SOL or 350+ other coins and your balance is deducted as you use the API. No credit card or KYC required.
What is the context window of Claude Opus 5 (Fast)?
Claude Opus 5 (Fast) supports a context window of 1M tokens, allowing you to process large documents, codebases, or long conversations in a single request.
What can I build with Claude Opus 5 (Fast)?
You can use Claude Opus 5 (Fast) to analyze images and visual content, tackle complex multi-step reasoning tasks, build autonomous agents that call external tools and APIs, answer questions with real-time web search, generate structured JSON output for data pipelines and process long documents and entire codebases. Because it's served through Qubax's OpenAI-compatible API, integration into existing apps, agents, or workflows takes just a few lines of code.
How fast and reliable is Claude Opus 5 (Fast) on Qubax?
Responses stream token by token. 28 sellers serve it, so if one is slow or down the request moves to the next.
Claude Opus 5 (Fast) vs GPT-5.4 Image 2: which should I choose?
Claude Opus 5 (Fast) by Anthropic and GPT-5.4 Image 2 by OpenAI are both strong models in a similar price tier. Claude Opus 5 (Fast) excels at complex reasoning and supports vision/image inputs. GPT-5.4 Image 2 comes from a different lab and may have different strengths depending on your workload. On Qubax, Claude Opus 5 (Fast) starts at $6.94/1M input tokens while GPT-5.4 Image 2 comes in at $3.60/1M, so GPT-5.4 Image 2 may be worth considering if you need to minimize per-token cost. Both are available on Qubax with crypto payments and OpenAI-compatible APIs, so you can try each and switch freely.
Can I use Claude Opus 5 (Fast) for commercial projects?
Yes. Claude Opus 5 (Fast) on Qubax can be used for commercial purposes. You own the outputs you generate. Qubax provides the API infrastructure — you bring your use case.
Why use Claude Opus 5 (Fast) on Qubax?
31% cheaper
Providers compete on price — you get the cheapest healthy seller.
Pay with crypto
350+ coins (BTC, ETH, SOL, USDT, USDC). No card, no KYC.
OpenAI & Anthropic compatible
Drop-in base URL. Works with Cline, Cursor, Claude Code, OpenAI and Anthropic SDKs.