GPQA Diamond
Graduate-level scientific reasoning
98.0%
ARC-AGI-2
Abstract reasoning on novel puzzles
83.9%
FrontierMath
Expert-level mathematics
93.4%
OTIS Mock AIME
Competition mathematics
100.0%
Google Agent Platform
Claude Sonnet 5.5
claude-sonnet-5-5 Fast Claude model for everyday coding, agents, and knowledge work
VisionTool CallingCachingReasoningWeb
Quick facts
- Released
- September 2026
- Model type
- Proprietary
- Model family
- Claude Sonnet
- Input modalities
- Supports: Text, Image, PDF
- Output modalities
- Supports: Text
- Available regions
- USEUGlobal
- Zero data retention
- Yes
- Available on nexos.ai
- Yes
Pricing and specifications of Claude Sonnet 5.5
Explore Claude Sonnet 5.5 pricing per million input, output, and cached tokens, along with its context window and maximum output limits.
Available providers
Specifications
Context window
1M tokens
Max output
128K tokens
Input
Output
Benchmarks of Claude Sonnet 5.5
How Claude Sonnet 5.5 scores on independent benchmarks tracked by Epoch AI.
Quality
Epoch Capabilities Index
166.7
ECI rank
#5 of 271
Benchmark data: Epoch AI, ‘Capabilities & benchmarking’ , licensed under CC BY 4.0 .
Quickstart
Start using Claude Sonnet 5.5
Model ID
claude-sonnet-5-5 Base URL
https://api.nexos.ai/v1 Code
from openai import OpenAI
# Get your API key from the nexos.ai dashboard
client = OpenAI(
base_url="https://api.nexos.ai/v1",
api_key="YOUR_NEXOS_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';
// Get your API key from the nexos.ai dashboard
const client = new OpenAI({
baseURL: 'https://api.nexos.ai/v1',
apiKey: 'YOUR_NEXOS_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.nexos.ai/v1/chat/completions \
-H "Authorization: Bearer YOUR_NEXOS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-sonnet-5-5",
"messages": [{"role": "user", "content": "Hello!"}]
}'Other Anthropic models
Models from Anthropic with comparable capabilities and pricing.
Start building with Claude Sonnet 5.5
Access Claude Sonnet 5.5 and 200+ other AI models through nexos.ai.
FAQ
Common questions about Claude Sonnet 5.5, its availability and usage.
Claude Sonnet 5.5 pricing starts at $2.00 per 1 million input tokens and $10.00 per million output tokens. Prices may vary depending on the provider, region, and caching options. See the pricing table above for a full comparison.
Claude Sonnet 5.5 supports a context window of 1,000,000 tokens, with a maximum output of 128,000 tokens. The context window determines how much information the model can process in a single request.
Claude Sonnet 5.5 supports vision, tool calling, prompt caching, reasoning, and web search. These features can be used individually or together, depending on the model and your application’s requirements.
Claude Sonnet 5.5 is available through Google Agent Platform, with deployment options in the US, EU, and Global regions. Availability may vary by provider. See the provider comparison table above for details.
Zero data retention (ZDR) is available for Claude Sonnet 5.5 through Google Agent Platform. With ZDR, supported providers do not retain request and response content after processing, subject to their applicable policies.
To use Claude Sonnet 5.5 through nexos.ai, you’ll need an Enterprise plan. Once your account is set up, create an API key, set your base URL to https://api.nexos.ai/v1, and specify claude-sonnet-5-5 in your API request. nexos.ai is OpenAI-compatible, so you can use your existing SDK integration by updating the API key, base URL, and model ID.