Claude Sonnet 5.5 API
Anthropic
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
About Claude Sonnet 5.5
Claude Sonnet 5.5 is a 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.
As of Sep 29, 2026, Claude Sonnet 5.5 costs $4.39 per 1M input tokens and $21.94 per 1M output tokens on Qubax. A typical 1,000 chat requests (2K tokens in, 500 out) come to about $19.74. Pay with USDC, USDT, BTC, ETH or 200+ other coins — no credit card required.
Pricing
| Token Type | Qubax | OpenRouter | You Save |
|---|---|---|---|
| Input (per 1M tokens) | $4.39 | $2.00 | — |
| Output (per 1M tokens) | $21.94 | $10.00 | -119% |
| Cache read (per 1M tokens) | $0.260 | — | — |
Prices per 1 million tokens. Pay with 200+ cryptocurrencies. Cache read is the discounted rate providers offer for repeated prompt prefixes.
Estimated Monthly Cost
Specifications
Use Cases
Capabilities
Quick Start
from openai import OpenAI
client = OpenAI(
base_url="https://api.qubax.ai/v1",
api_key="qbx_live_YOUR_API_KEY",
)
response = client.chat.completions.create(
model="claude-sonnet-5.5",
messages=[
{"role": "user", "content": "Hello!"}
],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.qubax.ai/v1",
apiKey: "qbx_live_YOUR_API_KEY",
});
const response = await client.chat.completions.create({
model: "claude-sonnet-5.5",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);curl https://api.qubax.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer qbx_live_YOUR_API_KEY" \
-d '{
"model": "claude-sonnet-5.5",
"messages": [{"role": "user", "content": "Hello!"}]
}'Get your API key from the dashboard.
Why use Claude Sonnet 5.5 on Qubax?
Best Prices
Up to 99% off OpenRouter prices
Pay with Crypto
200+ coins (BTC, ETH, SOL, USDT, USDC & more). No credit card needed.
OpenAI Compatible
Drop-in replacement. Works with Cline, Cursor, any tool.
More from Anthropic
Compare Claude Sonnet 5.5 with alternatives
| Model | Provider | Input / 1M | Output / 1M | vs Claude Sonnet 5.5 |
|---|---|---|---|---|
| Claude Sonnet 5.5 | Anthropic | $4.39 | $21.94 | — |
| Sakana: Fugu Ultra v2 | Other | $3.25 | $19.50 | Cheaper |
| Gemini 3.5 Flash | $5.02 | $20.09 | More expensive | |
| Gemini 3.1 Pro | $2.34 | $14.04 | Cheaper | |
| Grok 4 | xAI | $3.31 | $16.57 | Cheaper |
Frequently Asked Questions
How much does the Claude Sonnet 5.5 API cost?
On Qubax, Claude Sonnet 5.5 costs $4.39 per 1M input tokens and $21.94 per 1M output tokens.
Is the Claude Sonnet 5.5 API compatible with OpenAI?
Yes. Qubax provides an OpenAI-compatible API. You can use Claude Sonnet 5.5 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.
How do I pay for Claude Sonnet 5.5 API usage?
Qubax uses prepaid crypto credits. Deposit USDC on the Base chain and your balance is automatically deducted as you use the API. No credit card required. Top up from $3.
What is the context window of Claude Sonnet 5.5?
Claude Sonnet 5.5 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 Sonnet 5.5?
Claude Sonnet 5.5 is versatile enough for a wide range of applications. You can use it 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, process long documents and entire codebases, and more. 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 is Claude Sonnet 5.5 on Qubax?
Claude Sonnet 5.5 on Qubax supports streaming responses, so tokens begin arriving in real time as they're generated. Latency depends on the provider and prompt complexity. Qubax routes requests through an intelligent routing layer, which selects the fastest available compute provider for each request — so you get competitive latency at a lower price.
Claude Sonnet 5.5 vs Sakana: Fugu Ultra v2: which should I choose?
Claude Sonnet 5.5 by Anthropic and Sakana: Fugu Ultra v2 by Other are both strong models in a similar price tier. Claude Sonnet 5.5 excels at complex reasoning and supports vision/image inputs. Sakana: Fugu Ultra v2 comes from a different lab and may have different strengths depending on your workload. On Qubax, Claude Sonnet 5.5 starts at $4.39/1M input tokens while Sakana: Fugu Ultra v2 comes in at $3.25/1M, so Sakana: Fugu Ultra v2 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 Sonnet 5.5 for commercial projects?
Yes. Claude Sonnet 5.5 on Qubax can be used for commercial purposes. You own the outputs you generate. Qubax provides the API infrastructure — you bring your use case.
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