30% offClaude Opus 4.8 Fast API
Anthropic·Text· 100.0% success (7d)
Claude Opus 4.8 low-latency variant Qubax (). Skips extended thinking for faster response at higher per-token cost.
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 · 6
Specifications
- Context window
- 1M
- Max output
- 128K
- Type
- Text
- Creator
- Anthropic
- Live sellers
- 28
- Requests / 24h
- 185
Price history · 60 days
Estimated monthly cost
30 days at the cheapest live price.
Benchmarks & reliability
LiveBench score + measured network performance. Leaderboard →
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-4-8-fast",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)About Claude Opus 4.8 Fast
Claude Opus 4.8 Fast is a language model developed by Anthropic. It's particularly well-suited for orchestrating tool-using agents that call APIs and external services, 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 4.8 Fast costs $7.00 per 1M input tokens and $35.01 per 1M output tokens on Qubax, versus $10.00 / $50.00 on OpenRouter (30% less on input). A typical 1,000 chat requests (2K tokens in, 500 out) come to about $31.50. Measured availability over the last 7 days: 100.0%. 28 independent compute providers currently serve it, so requests fail over automatically. It handled 185 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 4.8 Fast API cost?
On Qubax, Claude Opus 4.8 Fast costs $7.00 per 1M input tokens and $35.01 per 1M output tokens. This is 30% cheaper than OpenRouter's price of $10.00 per 1M input tokens.
Is the Claude Opus 4.8 Fast API compatible with OpenAI?
Yes. Qubax provides an OpenAI-compatible API. You can use Claude Opus 4.8 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 4.8 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 — 30% cheaper than OpenRouter's price for Claude Opus 4.8 Fast.
How do I pay for Claude Opus 4.8 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 4.8 Fast?
Claude Opus 4.8 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 4.8 Fast?
You can use Claude Opus 4.8 Fast to build autonomous agents that call external tools and APIs, 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 4.8 Fast on Qubax?
Measured time to first token (p95) on Qubax is 3.1s. Its 7-day success rate is 100.0%. Responses stream token by token. 28 sellers serve it, so if one is slow or down the request moves to the next.
How good is Claude Opus 4.8 Fast on benchmarks?
Claude Opus 4.8 Fast scores 76.2 on LiveBench, ranking #5 of 16 models we track. At Qubax prices that is 3.0 points per $1 per 1M tokens.
Claude Opus 4.8 Fast vs GPT-5.4 Image 2: which should I choose?
Claude Opus 4.8 Fast by Anthropic and GPT-5.4 Image 2 by OpenAI are both strong models in a similar price tier. Claude Opus 4.8 Fast is well-suited for general-purpose language tasks. GPT-5.4 Image 2 comes from a different lab and may have different strengths depending on your workload. On Qubax, Claude Opus 4.8 Fast starts at $7.00/1M 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 4.8 Fast for commercial projects?
Yes. Claude Opus 4.8 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 4.8 Fast on Qubax?
30% 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.